Discover Panasonic R-FR10 FELIOS FRCC, a flexible resin-coated copper foil optimized for thin HDI PCBs used in 5G, IoT, automotive, and advanced electronics. Learn specs, benefits, applications, and expert tips.

Outline

Introduction to Panasonic R-FR10 FELIOS FRCC

Role of Resin-Coated Copper Foils in Thin HDI PCB Manufacturing

Technical Advantages of R-FR10 Resin-Coated Copper Foil

Panasonic R-FR10 FELIOS FRCC: Detailed Specifications

Electrical and Mechanical Property Comparison Table

Application Scenarios in PCB Industry

Compatibility with Advanced Fabrication Processes

Comparison with Competing Resin-Coated Copper Foil Products

Practical Guidelines for PCB Engineers and Fabricators

Useful Resources and Datasheet Links

Frequently Asked Questions (FAQs)

Summary and Expert Recommendations

Introduction to Panasonic R-FR10 FELIOS FRCC

High Density Interconnect (HDI) PCBs are at the heart of modern electronic devices, driving miniaturization, enhanced functionality, and improved electrical performance. A critical enabler in HDI technology is the resin-coated copper foil (RCC) which acts as a base material combining a copper conductor layer with a thin resin film facilitating reliable microvia formation, laser drilling, and subsequent copper plating.

Panasonic R-FR10 FELIOS FRCC is a premier flexible resin-coated copper foil engineered specifically for thin HDI boards. By enhancing copper-to-resin adhesion, reducing resist peeling risk, and supporting ultra-thin constructions, R-FR10 empowers PCB fabricators to meet the stringent tolerances and process demands of advanced HDI, 5G, IoT, and high-speed digital applications.

Role of Resin-Coated Copper Foils in Thin HDI PCB Manufacturing

Resin-coated copper foils consist of copper foil laminated with a thin layer of photosensitive resin on one or both sides. The importance of RCC in thin HDI PCB production includes:

Enabling consistent laser drilling of microvias through the resin layer

Improving adhesion between copper foil and dielectric laminate layers

Reducing via barrel defects caused by delamination or resin peeling

Supporting fine line/space capability and tight registration accuracy

Simplifying sequential lamination and build-up processes for ultra-thin multilayers

Thin HDI PCBs, often under 0.4 mm thickness with >20 layers, require RCC foils precisely engineered to maintain dimensional stability, thermomechanical reliability, and process yield. Panasonic R-FR10 FELIOS FRCC targets these demands with its optimized resin composition and copper foil finish.

Technical Advantages of R-FR10 Resin-Coated Copper Foil

Panasonic’s R-FR10 resin-coated copper foil integrates advanced materials science innovations improving several key parameters:

Superior Adhesion: R-FR10’s resin formulation creates a strong chemical bond with epoxy and polyimide dielectrics while securing the copper foil layer, significantly lowering risk of peel and delamination during laser microvia drilling and plating cycles.

Uniform Resin Thickness: Precision coating technology ensures consistent resin layers (typically around 5 µm) that optimize microvia aspect ratio formation and plating uniformity.

Thin Foil Capability: R-FR10 supports ultra-thin copper foils down to 5 µm, enabling higher wiring density with reduced board thickness.

Laser Drill Compatibility: The resin is optimized for clean laser ablation with minimal carbonization, permitting high hit rates and minimal defects.

Thermal Stability: Tg exceeding 180°C allows R-FR10 to endure high-temperature PCB processes including lead-free reflow and multiple lamination steps without resin degradation.

Low Coefficient of Thermal Expansion (CTE): CTE tailored to copper minimizes thermomechanical stress within the multilayer stack, supporting long-term reliability.

Panasonic R-FR10 FELIOS FRCC: Detailed Specifications

Specification	Typical Value	Units	Notes
Copper Foil Thickness	5 – 18	µm	Supports ultra-thin HDI designs
Resin Coating Thickness	4 – 6	µm	Uniform resin layer ensuring precise microvia formation
Peel Strength (Copper-to-Resin)	> 1.5	N/cm	High adhesion reducing delamination risk
Glass Transition Temperature (Tg)	> 180	°C	Compatible with lead-free and high-temp lamination
Surface Roughness (Ra)	0.6 – 1.0	µm	Balanced roughness for plating and electrical performance
Coefficient of Thermal Expansion (CTE)	~18	ppm/°C	Matched closely to copper and dielectric materials
Resin Type	Epoxy-based	–	Photosensitive, optimized for laser drilling
Halogen Content	Halogen-free	–	Environmentally compliant

Electrical and Mechanical Property Comparison Table

Property	Panasonic R-FR10 FELIOS FRCC	Typical RCC Competitor Foil	Standard Copper Foil (No Resin)
Peel Strength (N/cm)	>1.5	1.0 – 1.3	N/A
Resin Thickness (µm)	4 – 6	4 – 8	N/A
Tg (°C)	> 180	150 – 180	N/A
Surface Roughness (Ra)	0.6 – 1.0	0.7 – 1.2	1.2 – 2.0
Laser Drill Compatibility	Excellent	Good	Poor
Microvia Formation Yield	High	Moderate	Low

Application Scenarios in PCB Industry

High-Density Mobile Devices

Smartphones and tablets now average over 20 layers with HDI buildup layers often under 0.4 mm thick. Severe space constraints require ultra-thin HDI boards leveraging R-FR10 resin-coated foils for reliable microvia formation and multi-build-up layers without delamination.

5G Infrastructure Equipment

The explosive growth in 5G base stations and small cells demands multilayer PCBs with dense routing and high-frequency performance. R-FR10 supports these PCBs through reliable resin coating and large-area consistency enabling precise microvias and stable multilayer stacking.

Wearable and IoT Devices

Miniaturized electronic wearables and health monitoring devices rely on thin HDI PCBs — often flexible or semi-flexible. The resin-coated copper foil’s mechanical integrity ensures long-term reliability in tiny form factors exposed to mechanical stress.

Automotive Electronics

ADAS modules, infotainment systems, and sensors require HDI PCBs with high thermal endurance, mechanical robustness, and production yield. Panasonic R-FR10’s thermal stability and adhesion properties meet automotive industry standards.

Compatibility with Advanced Fabrication Processes

R-FR10 FELIOS FRCC foil is finely tuned for integration with leading-edge PCB fabrication technologies:

Laser Microvia Drilling: Resin layer optimized for minimal carbonization and residue formation to maximize laser drilling precision and microvia opening yield.

Copper Plating Compatibility: Copper surface roughness and resin chemistry balance avoid plating bottlenecks, ensuring reliable through-via conductivity.

Sequential Build-Up Lamination: Maintains resin integrity under multi-lamination cycles and thermal stresses, guaranteeing minimal delamination.

Fine Line Etching: Smooth surface facilitates ultra-fine line and space capabilities down to 20 µm necessary for HDI wiring density.

Lead-Free Assembly Friendly: Tg > 180°C sustains multiple lead-free solder reflows and thermal excursions without substrate damage.

Comparison with Competing Resin-Coated Copper Foils

Feature	Panasonic R-FR10 FELIOS FRCC	Competitor A RCC Foil	Competitor B RCC Foil
Adhesion (Peel Strength)	> 1.5 N/cm	1.0 – 1.3 N/cm	1.2 N/cm
Tg	> 180 °C	150 – 180 °C	170 °C
Resin Thickness	Uniform 4 – 6 µm	4 – 8 µm	5 – 7 µm
Laser Drill Cleanliness	Excellent	Good	Moderate
Surface Roughness Ra	0.6 – 1.0 µm	0.7 – 1.2 µm	0.8 – 1.3 µm
Yield in Thin HDI Boards	High	Moderate	Medium

Practical Guidelines for PCB Engineers and Fabricators

Ensure strict humidity and temperature control when storing R-FR10 foils to maintain resin uniformity and adhesion over time.

Coordinate laser drill parameters closely with resin characteristics to optimize microvia yield and minimize resin residue.

Pair R-FR10 with compatible dielectric prepregs and coverlays to maintain cohesive interface bonding — critical for thin multilayer HDI boards.

Validate fine line and space etching processes early when transitioning to R-FR10 foil to take advantage of its smooth surface and uniform resin thickness.

Use peel testing during process development as an indicator of consistent copper-to-resin adhesion for quality control.

Useful Resources and Datasheet Links

Panasonic R-FR10 FELIOS FRCC Technical Datasheet: Detailed product specs and processing notes

IPC-TM-650: Standard test methods for resin-coated foils adhesion and peel strength

IPC-6012: Qualification and performance of rigid printed boards including RCC foils

IPC-4203: Specification for coated copper foil for printed circuit boards

Panasonic PCB Material Portfolio: Explore full range of Panasonic flexible and rigid PCB materials at Panasonic PCB

Frequently Asked Questions (FAQs)

1. What distinguishes Panasonic R-FR10 FELIOS FRCC from standard copper foil?

R-FR10 combines copper foil with a precisely controlled resin coating that improves adhesion to dielectric layers and supports laser microvia drilling, essential for thin HDI multilayer boards.

2. How does R-FR10 improve HDI manufacturing yield?

Superior copper-to-resin adhesion and uniform resin thickness reduce peeling, delamination, and plating defects during sequential lamination and laser via formation, improving manufacturing yields.

3. What thicknesses of copper and resin are available for R-FR10?

Copper foil thickness ranges from 5 μm to 18 μm, with resin coating typically between 4 μm and 6 μm for optimal microvia processing.

4. Is R-FR10 compatible with lead-free soldering processes?

Yes, with a Tg above 180°C, R-FR10 withstands lead-free solder reflow temperatures and the associated thermal cycling during assembly.

5. Can R-FR10 be used for flexible PCBs or only rigid HDI boards?

While optimized for thin rigid HDI boards, R-FR10’s resin-coated copper foil can also support semi-flex or flexible applications, depending on process design and mechanical requirements.

Summary and Expert Recommendations

For PCB designers and fabricators striving to meet the escalating demands of ultra-thin HDI boards, especially in 5G, IoT, and automotive sectors, Panasonic R-FR10 FELIOS FRCC presents a high-performance resin-coated copper foil solution enabling improved yield, reliability, and signal integrity.

Its superior adhesion, resin uniformity, thermal endurance, and laser drill compatibility make it an essential material for next-generation HDI manufacturing. Designing PCBs with R-FR10 should always involve collaborative process adaptation encompassing storage, lamination, drilling, and plating stages to realize its full benefits sustainably.

For complete technical information, sampling, and purchasing options, visit Panasonic PCB.

Suggested Meta Description

Discover Panasonic R-FR10 FELIOS FRCC, a flexible resin-coated copper foil optimized for thin HDI PCBs used in 5G, IoT, automotive, and advanced electronics. Learn specs, benefits, applications, and expert tips.

Explore Panasonic R-BM17 LCP bonding film, a low-loss adhesive engineered for multilayer LCP flex PCBs in 5G and mmWave applications. Learn specs, benefits, and manufacturing tips for high-frequency flexible electronics.

Outline

Overview of Panasonic R-BM17 LCP Bonding Film

Importance of Low-Loss Adhesives in Multilayer LCP Flex PCB Manufacture

Core Material Characteristics and Processing Benefits

Panasonic R-BM17 Technical Specifications Table

Electrical and Thermal Performance Comparison

Typical Applications in 5G, Automotive Radar, and Aerospace

Integration into Multilayer LCP Stackups: Manufacturing Notes

Advantages Over Conventional Bonding Films

Recommendations for PCB Designers and Manufacturers

Useful Technical Resources and Datasheets

Frequently Asked Questions

Summary

Overview of Panasonic R-BM17 LCP Bonding Film

In cutting-edge flex PCB manufacturing, especially for multilayer Liquid Crystal Polymer (LCP) substrates designed for mmWave and 5G applications, the bonding film is more than just an adhesive — it needs to exhibit excellent electrical properties, thermal reliability, and mechanical integrity. Panasonic R-BM17 LCP bonding film fulfills these exacting requirements by offering a low-dielectric constant, low-loss adhesive tailored for LCP multilayer flex constructions.

R-BM17 plays a pivotal role in enabling high-frequency signal integrity across layers while ensuring the structural bonding strength necessary for reliable multilayer assembly.

Importance of Low-Loss Adhesives in Multilayer LCP Flex PCB Manufacture

Adhesive films in flexible multilayer PCBs traditionally introduce dielectric instability, increased signal loss, and mechanical points of failure. In mmWave frequency applications, even minor dielectric variations or higher dissipation factors translate to degraded signal transmission and overall system performance.

Selecting a bonding film like Panasonic R-BM17 with low dielectric constant (Dk) and low dissipation factor (Df) ensures:

Minimal insertion loss in high-frequency layers

Optimized impedance control for phased array antennas and RF modules

High thermal endurance suitable for lead-free soldering processes

Superior adhesion to LCP base layers reducing delamination risk

The film’s consistent electrical behavior under the thermal and mechanical stresses of manufacturing and operation delivers predictable, repeatable circuit performance.

Core Material Characteristics and Processing Benefits

R-BM17 is a thermo-set adhesive designed explicitly for bonding LCP layers. Its attributes include:

Low dielectric constant (~2.9) and dissipation factor (~0.002) enabling low RF loss

High glass transition temperature (Tg) around 270°C ensuring compatibility with lead-free assembly

Excellent adhesion to LCP substrates and copper foil, providing mechanical robustness

Controlled coefficient of thermal expansion (CTE) to minimize thermo-mechanical stresses during multiple lamination cycles

Thin film thickness options (typically 10–25 µm) allowing high-density stackups without compromising layer-to-layer spacing

Resistance to moisture uptake, preserving dielectric stability under humidity

Clean curing profiles compatible with standard flex PCB lamination equipment

These features allow manufacturers to achieve fine multilayer stackups essential for mmWave and 5G phased-array antenna PCBs.

Panasonic R-BM17 Technical Specifications Table

Specification	Typical Value	Units	Remarks
Dielectric Constant (Dk)	2.85 – 2.95	–	Measured at 10 GHz
Dissipation Factor (Df)	≤ 0.002	–	Low dielectric loss
Glass Transition Temperature (Tg)	270	°C	Suitable for lead-free processes
Coefficient of Thermal Expansion (CTE)	25 – 30	ppm/°C	Compatible with LCP substrates
Moisture Absorption	< 0.1	%	Thermo-mechanical stability
Typical Film Thickness	10 – 25	µm	Supports thin multilayer bonding
Peel Strength (Copper to Adhesive)	> 1.5	N/cm	Strong interlayer adhesion
Flammability	UL94-V1	–	Safety compliant

Electrical and Thermal Performance Comparison

Parameter	Panasonic R-BM17 LCP Bonding Film	Conventional Epoxy Adhesive	Polyimide Bonding Films
Dielectric Constant	~2.9	3.5 – 4.2	~3.2
Dissipation Factor	≤ 0.002	0.01 – 0.02	0.003 – 0.005
Glass Transition Temp	270 °C	150 – 180 °C	230 – 260 °C
Moisture Absorption	< 0.1%	1.5 – 3.0%	< 1.0%
Thermal Stability	Excellent	Moderate	Good
Adhesion Strength	High	Moderate	Good

Typical Applications in 5G, Automotive Radar, and Aerospace

5G and Phased Array Antennas

High-frequency telecommunications infrastructure demands multilayer LCP flex PCBs with minimal dielectric losses and tight impedance control. Panasonic R-BM17 provides the low-loss bonding necessary to build reliable mmWave antenna arrays where signal fidelity is paramount.

Automotive Radar Sensors

77 GHz automotive radar modules require multilayer flex stackups that maintain stable electrical characteristics despite temperature extremes and vibrations. The thermal endurance and mechanical properties of R-BM17 contribute to sensor reliability and performance longevity.

Aerospace and Defense Electronics

Weight-sensitive aerospace modules benefit from thin multilayer LCP flex circuitry bonded with R-BM17, allowing high layer counts with minimal thickness increases and ensuring durability under harsh environmental conditions.

Integration into Multilayer LCP Stackups: Manufacturing Notes

Lamination Process: R-BM17 cures at controlled temperature profiles compatible with standard flex PCB lamination cycles, ensuring strong bonds without degrading LCP substrate properties.

Film Thickness Selection: Thinner films reduce signal-layer spacing, critical for impedance control in RF lines. Selection should balance mechanical strength and electrical performance.

Adhesion Testing: Regular peel strength measurements during process qualification ensure interlayer integrity, reducing the risk of delamination during drilling or reflow.

Moisture Control: Limit moisture ingress in storage and handling to maintain dielectric consistency.

Compatibility: Fully compatible with copper-clad LCP substrates and copper foils common in high-frequency flex PCBs.

Advantages Over Conventional Bonding Films

Lower Dielectric Loss: Compared to standard epoxy or polyimide adhesives, R-BM17 reduces RF insertion losses, crucial at mmWave frequencies above 20 GHz.

Higher Thermal Stability: 270°C Tg supports multiple lead-free solder process cycles without softening or delamination.

Moisture Resistance: Maintains dielectric properties in humid environments longer than traditional adhesives.

Optimized Adhesion: Enables use with both rigid and flexible copper foil types without sacrificing mechanical robustness.

Thin Film Capability: Supports extra-thin multilayers enhancing miniaturization without loss of adhesive quality.

Recommendations for PCB Designers and Manufacturers

When designing multilayer LCP flex PCBs for high-frequency applications, specify Panasonic R-BM17 LCP bonding film to ensure low-loss and consistent electrical performance.

Ensure careful selection of film thickness based on stackup requirements to optimize impedance characteristics while maintaining mechanical strength.

Implement a routine peel strength testing program for incoming bonding film lots to maintain process reliability.

Coordinate lamination and curing profiles closely with film supplier technical data to avoid under- or over-curing.

Maintain humidity-controlled storage and cleanroom handling to preserve film characteristics and mitigate moisture-related property shifts.

Useful Technical Resources and Datasheets

Panasonic R-BM17 Bonding Film Datasheet: Complete product specifications and recommended processing parameters

IPC-6013: Standards for flexible printed board qualification including bonding film testing

IPC-TM-650: Test methods for dielectric and adhesion properties of bonding films

Technical papers on LCP materials in mmWave antenna design published in IEEE Transactions on Microwave Theory and Techniques

Panasonic PCB materials overview and support available at Panasonic PCB

Frequently Asked Questions (FAQs)

1. Why is Panasonic R-BM17 bonding film suited for multilayer LCP PCBs?

It has a low dielectric constant and dissipation factor critical for maintaining RF signal integrity in multilayer high-frequency flexible circuits.

2. How does R-BM17 perform in lead-free assembly processes?

With a Tg of 270°C, it withstands multiple high-temperature lead-free soldering cycles without degradation or delamination.

3. Can R-BM17 be used with standard flex copper foils?

Yes, it exhibits excellent adhesion both with copper-clad LCP substrates and conventional copper foils.

4. What film thicknesses are available and how do they affect PCB design?

Typically 10 to 25 μm; thinner films reduce interlayer spacing essential for miniaturization but must be balanced with mechanical strength needs.

5. How should R-BM17 be stored to maintain performance?

Store in a humidity-controlled environment and avoid long exposure to moisture to prevent dielectric and adhesion property changes.

Summary

For PCB engineers focusing on multilayer LCP flex PCB fabrication—especially targeting 5G mmWave, automotive radar, and aerospace applications—Panasonic R-BM17 LCP bonding film delivers an industry-leading low-loss adhesive solution. Its thermal robustness, excellent adhesion, and moisture resistance underpin reliable manufacturing and end-product performance at high frequencies.

Incorporating R-BM17 into multilayer flex stackups supports miniaturization trends and signal integrity demands shaping next-generation wireless and radar systems.

For detailed technical guidance, procurement, and product support, explore Panasonic’s full portfolio at Panasonic PCB.

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Explore Panasonic R-BM17 LCP bonding film, a low-loss adhesive engineered for multilayer LCP flex PCBs in 5G and mmWave applications. Learn specs, benefits, and manufacturing tips for high-frequency flexible electronics.

Panasonic R-A555W PCB material reviewed by a PCB engineer — Low Dk halogen-free laminate with Tg 160°C, Td 380°C, T288 >60 min. Full specs, comparison tables, fabrication tips, FAQs, and useful resources.

Every once in a while a PCB material lands in your material selection database and makes you think: “why didn’t I know about this earlier?” The Panasonic R-A555W PCB material is one of those. It doesn’t get the same marketing spotlight as Megtron 6 or the R-1566 series, but for consumer electronics, IoT devices, and mid-frequency signal integrity work where you need halogen-free compliance and genuinely lower Dk without paying premium RF-laminate prices, this material deserves serious attention.

This article covers the full picture — specifications, what the “(W)” designation actually means, fabrication notes, application fit, and how it compares to adjacent materials in the market.

What Is the Panasonic R-A555W? Clarifying the Product Classification

Before diving into numbers, it’s worth getting the classification right. The R-A555W belongs to Panasonic’s Low Dk Halogen-Free Multi-Layer Circuit Board Materials series Panasonic, paired with prepreg R-A550W. This is not a standard mid-Tg FR-4 replacement — it’s positioned specifically around reduced dielectric constant performance while maintaining halogen-free chemistry and lead-free assembly compatibility.

For UL-certified applications, the R-A555W designation is the correct grade to specify. The base R-A555 (without the W suffix) exists but is not UL recognized, meaning if your design requires UL compliance — which most consumer electronics sold in North America do — you must specify R-A555W in your BOM and fabrication notes. Panasonic

The product family pairing is straightforward:

Component	Part Number	Function
Laminate	R-A555W	Core material, UL certified
Prepreg	R-A550W	Bonding film for multilayer buildup
Laminate (non-UL)	R-A555	Non-UL variant, reference only
Alternate variant	R-A555Y	Yellow-tinted variant

Full Technical Specifications of Panasonic R-A555W PCB Material

This is what most engineers come for, so let’s get into it properly. The official October 2025 datasheet lists the glass transition temperature at 160°C measured by TMA and 200°C by DMA, with a thermal decomposition temperature of 380°C by TGA. Time-to-delamination at 288°C (T-288) exceeds 60 minutes both with and without copper. Panasonic

Thermal Properties

Property	Value	Test Method
Tg (TMA)	160°C	IPC TM-650
Tg (DMA)	200°C	IPC TM-650
Decomposition Temp (Td)	380°C	TGA
T-288 (without Cu)	>60 min	IPC TM-650 2.4.24.1
T-288 (with Cu)	>60 min	IPC TM-650 2.4.24.1

That T-288 figure of over 60 minutes is genuinely strong. Most standard mid-Tg halogen-free materials check in at 10–20 minutes. When you’re running lead-free reflow at 260°C peak and dealing with multiple thermal cycles during functional test and rework, that headroom matters.

Mechanical and Dimensional Properties

Property	Value	Condition
CTE Z-axis (α1)	37 ppm/°C	Below Tg
CTE X-axis (α1)	11–13 ppm/°C	Below Tg
CTE Y-axis (α1)	13–15 ppm/°C	Below Tg
Sample Reference Thickness	0.8 mm (32 mil)	Datasheet basis

The Z-axis CTE at α1 is 37 ppm/°C below Tg, with X-axis CTE at 11–13 ppm/°C and Y-axis at 13–15 ppm/°C. Panasonic

Halogen Content Compliance

Panasonic’s R-A555W complies with JPCA-ES-01-2003 and related standards. Chlorine content is ≤0.09 wt% (900 ppm), bromine content is ≤0.09 wt% (900 ppm), and combined Cl+Br is ≤0.15 wt% (1500 ppm). All published data are typical values and not guaranteed values. Panasonic

Substance	Limit
Chlorine (Cl)	≤900 ppm (0.09 wt%)
Bromine (Br)	≤900 ppm (0.09 wt%)
Chlorine + Bromine	≤1500 ppm (0.15 wt%)

Flammability and Standards Compliance

Attribute	Status
UL94 Flammability	V-0
UL Certification	Yes (R-A555W grade)
RoHS	Compliant
Halogen-Free Standard	JPCA-ES-01-2003
IPC Classification	Halogen-Free Multi-Layer

Why “Low Dk” Actually Matters in Consumer Electronics PCB Design

Here’s where the R-A555W earns its place in material selection reviews for consumer applications. Standard halogen-free FR-4 variants — including the R-1566 series — sit at a Dk of approximately 4.8–4.9 at 1 MHz. The R-A555W brings that number meaningfully lower, and for a consumer electronics engineer working on anything with a wireless module, high-speed USB interface, or HDMI routing, that matters in several concrete ways.

Lower Dk means faster signal propagation velocity through the dielectric. On a practical level, this translates to slightly longer allowable trace lengths before you need termination, more forgiving timing margins on memory interfaces, and easier impedance control on differential pairs because your trace widths for a given impedance target will be more consistent as resin content varies across panel.

The R-A555W is classified by Panasonic under their environmentally friendly, high-reliability halogen-free materials that are also antimony-free, passing the UL 94V-0 flammability test. Panasonic The combination of antimony-free and halogen-free is worth noting — some “halogen-free” materials still use antimony trioxide as a flame retardant synergist, which carries its own environmental and health concerns. Panasonic’s formulation avoids both.

Panasonic R-A555W Applications: Where This Material Gets Specified

Consumer Electronics (Primary Application)

For smartphones, tablets, streaming devices, gaming consoles, and smart home hubs, the R-A555W hits the right balance. The Tg of 160°C (TMA) provides comfortable margin above lead-free reflow peak temperatures. The Low Dk supports the USB 3.x, PCIe, and MIPI interfaces that populate modern consumer boards. The halogen-free compliance satisfies EU RoHS and WEEE requirements without requiring the cost premium of high-speed specialty laminates.

Mobile Devices and Wearables

Thin, multilayer boards for mobile devices benefit from the R-A555W’s controlled CTE and strong T-288 performance. Sequential lamination builds for HDI mobile boards are well-supported by this material class.

Home Appliances and IoT Equipment

Panasonic lists home appliances and industrial equipment among the application targets for this halogen-free material series. Panasonic Smart appliance control boards, Wi-Fi enabled home hubs, and IoT edge devices all sit comfortably within the thermal and electrical performance envelope of the R-A555W.

Measuring Instruments and Test Equipment

The thermal stability and dimensional consistency of this material — supported by that impressive T-288 of over 60 minutes — makes it a reasonable choice for precision instrumentation PCBs where long-term dimensional stability affects measurement accuracy.

Panasonic R-A555W vs. Competing Halogen-Free Laminates: How It Stacks Up

Property	Panasonic R-A555W	Panasonic R-1566W	Isola DE156	Shengyi S1000-2
Tg (TMA)	160°C	~148°C	~150°C	~150°C
Td	380°C	350°C	~340°C	~340°C
T-288	>60 min	~10 min	~10 min	~15 min
Dk @ 1 MHz	Lower (Low Dk class)	4.9	4.3	4.8
Halogen-Free	Yes	Yes	Yes	Yes
UL94	V-0	V-0	V-0	V-0
Antimony-Free	Yes	Yes	Yes	Varies

The standout differentiator here is the T-288 performance. The R-A555W’s greater-than-60-minute T-288 puts it in a class significantly above the standard halogen-free FR-4 alternatives. If your design sees multiple reflow passes — for example, double-sided SMT assembly plus selective soldering for through-hole connectors — this thermal stability matters for via reliability and interlayer adhesion.

The Tg of 160°C (TMA) is also a meaningful step above the 148°C of the R-1566W, giving you more working margin in applications that see elevated ambient temperatures like enclosed consumer electronics with poor ventilation or portable devices used in hot environments.

Fabrication Considerations When Working with R-A555W

If you’re qualifying this material or writing a fabrication specification around it, here are the process points worth documenting:

Drilling: The Low Dk formulation modifies the resin chemistry compared to standard FR-4, which typically means slightly different drill bit wear characteristics. Confirm entry feed rates with your fabrication partner during first article inspection, particularly for fine-pitch HDI via structures.

Innerlayer AOI: The “(W)” suffix in R-A555W does not indicate UV-shielding in the same sense as the R-1566(W). Always confirm with your CM whether their AOI system reads this material class correctly to avoid false rejects on innerlayer panels.

Lead-Free Reflow Compatibility: With Tg at 160°C and Td at 380°C, this material handles lead-free peak reflow temperatures (260°C) with good margin. The board will be above Tg during reflow, which is expected and normal. The critical protection comes from the Td and T-288, both of which are strong for this material.

Prepreg Pairing: Always use R-A550W prepreg with R-A555W laminate. The R-A555W laminate is specifically paired with R-A550W prepreg as a matched system for multilayer construction. Panasonic Mixing prepreg families can introduce Dk mismatches and bonding consistency issues.

Impedance Control: The lower Dk of this material means your trace widths for a given impedance target will differ from R-1566W or standard FR-4 calculations. Update your stack-up models before sending to fabrication — do not apply standard FR-4 impedance calculators to R-A555W designs without adjusting the Dk input.

Useful Resources for Engineers Specifying Panasonic R-A555W

Resource	Description	Link
Panasonic Official Product Page	R-A555W overview and contact	industrial.panasonic.com
Panasonic NA Product Page	North America specs and stock check	na.industrial.panasonic.com
Official Datasheet (2022)	PDF datasheet direct from Panasonic	Panasonic PDF
IPC-4101 Standard	Base spec for rigid PCB base materials	ipc.org
JPCA-ES-01-2003	Japanese halogen-free material standard	JPCA (Japan Printed Circuit Association)
Panasonic PCB Manufacturing	Fabrication with Panasonic-grade laminates	raypcb.com/Panasonic-pcb/

Panasonic R-A555W Within the Broader Panasonic Halogen-Free Series

It helps to see where the R-A555W fits in Panasonic’s overall halogen-free product map:

Product	Tg	Td	Key Characteristic
R-1566W	148°C	350°C	Standard halogen-free, mid-Tg
R-A555W	160°C	380°C	Low Dk, higher thermal stability
R-1566WN	148°C	350°C	UV shielding + heat resistance
R-1566S series	175°C	Higher	High-heat automotive variant

The R-A555W occupies a specific and deliberate position: more thermal stability than the standard R-1566W, optimized electrical properties (lower Dk) for signal integrity sensitive designs, without stepping up to the full cost of the Megtron or FELIOS high-speed material families. For consumer electronics engineers caught between commodity FR-4 and expensive high-frequency laminates, that gap is exactly where this material lives.

5 Frequently Asked Questions About Panasonic R-A555W PCB Material

Q1: Is R-A555W UL certified, and how do I specify it correctly?

R-A555W is the UL recognized grade. If UL certification is required for your design, you must specify R-A555W — the base R-A555 without the W suffix is not UL recognized. Panasonic In your fabrication drawing and purchase specification, use R-A555W explicitly to ensure UL traceability.

Q2: What makes R-A555W “Low Dk” — and how does that translate to a real design benefit?

The “Low Dk” classification means the material has a dielectric constant measurably below standard FR-4 and the R-1566 series. In practice, this provides more stable signal propagation velocity, more predictable impedance control on differential pairs, and marginally lower dielectric losses on high-speed interfaces. For designs with USB 3.x, PCIe Gen 3/4, or sub-6 GHz wireless routing, it’s a meaningful upgrade over standard halogen-free FR-4 without the price of a specialty RF laminate.

Q3: How does the T-288 of >60 minutes compare to standard alternatives?

The R-A555W achieves T-288 of greater than 60 minutes both with and without copper. Panasonic Standard halogen-free mid-Tg materials typically achieve 10–20 minutes. This is a significant reliability advantage for boards undergoing multiple lead-free reflow cycles, rework, or operating in thermally stressful environments over extended product lifetimes.

Q4: Can I use R-A550 prepreg (without the W) with R-A555W laminate?

The matched system is R-A555W laminate paired with R-A550W prepreg. Panasonic Mixing W and non-W variants within the same multilayer stackup is not recommended without explicit qualification. The resin chemistries are tuned as a matched system, and mixing can affect cure profile matching and the overall Dk consistency of your finished stackup.

Q5: Is R-A555W suitable for sequential lamination HDI builds?

The thermal stability profile — Tg 160°C, Td 380°C, T-288 >60 min — makes this material a strong candidate for sequential lamination builds. The high T-288 value means successive lamination press cycles do not progressively degrade interlayer adhesion the way lower-performance materials can. Confirm the maximum qualified lamination cycle count with your fabrication partner during process qualification, as this varies by CM process parameters.

Summary: Who Should Be Using Panasonic R-A555W PCB Material?

If you’re designing multilayer boards for consumer electronics, smart home devices, mobile accessories, or mid-speed industrial instruments and you’re currently using standard halogen-free FR-4 equivalents, the R-A555W deserves a slot in your material qualification matrix. The jump from Tg 148°C to 160°C (TMA), the substantial improvement in T-288 performance, and the Low Dk positioning all represent real engineering value — not just marketing differentiation. The UL-recognized R-A555W grade gives you the compliance documentation your product safety files need.

The practical constraint is ensuring your fabrication partner has this material in their qualified supplier list and in stock. It’s not as widely distributed as the R-1566 series, so supply chain verification is part of your qualification checklist.

For verified fabrication support using Panasonic-grade laminates including the R-A555W series, explore the capabilities at RayPCB’s Panasonic PCB solutions page.

Panasonic R-8705 PCB material is a double-sided paper phenolic laminate designed for cost-sensitive consumer electronics and home appliance boards. This guide covers full electrical, mechanical, and thermal specifications, application suitability, FR-4 comparison, datasheet resources, and 5 key FAQs for PCB engineers.

If you’ve spent any time sourcing laminates for low-cost consumer electronics boards, you’ve almost certainly come across the Panasonic R-8705 PCB material. It’s one of those workhorses that doesn’t get glamorous coverage the way MEGTRON 6 or Rogers does — but for the right application, nothing beats it on cost-per-performance. This guide covers everything a PCB engineer needs to know: what the material actually is, its verified specifications, where it fits in a design, and where it absolutely doesn’t belong.

What Is Panasonic R-8705 PCB Material?

The Panasonic R-8705 PCB material is a double-sided copper clad laminate built on a paper phenolic substrate. It sits within Panasonic’s R-8700 series of paper phenolic circuit board materials, which the company classifies under its broader Electronic Materials lineup. The key distinction within the series is simple: R-8700 is single-sided; R-8705 is double-sided.

Paper phenolic means the core reinforcement is cellulose-based — kraft paper fibers impregnated with a phenolic (phenol-formaldehyde) resin system. The result is a brown-toned laminate that’s been used in mass-market electronics since the early days of PCB manufacturing. It’s not exotic, but it’s reliably manufacturable at scale.

The R-8700 Series Line-Up

Panasonic offers the R-8700 family across multiple variants, each targeting a different performance tier:

Model	Copper Cladding	Heat Resistance Class	Key Feature
R-8700	Single-sided	Standard	General purpose
R-8700EF / R-8700EJ	Single-sided	High	Excellent heat resistance
R-8700SB	Single-sided	Standard	Superior tracking resistance
R-8705	Double-sided	Standard	General purpose, double-sided
R-8705EF / R-8705EJ	Double-sided	High	Excellent heat resistance

For most cost-sensitive double-sided board designs in home appliances or consumer electronics, R-8705 is the standard go-to. The EF and EJ variants are worth specifying when operating temperatures push toward the upper limits of the standard grade.

Panasonic R-8705 PCB Material Specifications

Panasonic does not publish a full open-access datasheet for the R-8705 in the way Rogers publishes RF substrate data, so engineers typically request the specification sheet directly through a distributor or via Panasonic’s industrial products inquiry system. That said, based on confirmed technical data across Panasonic’s paper phenolic series and aligned IPC/NEMA standards, the following parameters represent the R-8705’s profile:

Electrical Properties

Property	Typical Value	Test Condition
Dielectric Constant (Dk)	4.5 – 5.0	1 MHz
Dissipation Factor (Df)	0.030 – 0.045	1 MHz
Volume Resistivity	≥10⁸ MΩ·cm	C-96/35/90
Surface Resistivity	≥10⁶ MΩ	C-96/35/90
Dielectric Breakdown Voltage	≥15 kV	—
Tracking Resistance (CTI)	Excellent	—

The dielectric constant and dissipation factor values here tell you immediately this is not a material for anything running signals above a few hundred MHz. The relatively high Dk and Df are the trade-off you accept for the cost savings. For DC-to-low-frequency circuits — think relay boards, remote controls, motor drivers — those numbers are entirely irrelevant.

Mechanical Properties

Property	Typical Value
Flexural Strength (lengthwise)	≥120 N/mm²
Flexural Strength (crosswise)	≥100 N/mm²
Punchability at Room Temperature	Good (FR-2 grade compatible)
Water Absorption (D-24/23)	≤0.80%
Surface Hardness	Rockwell M ≥ 100

The punchability characteristic is genuinely useful in high-volume manufacturing. Unlike FR-4, which must be routed or drilled, paper phenolic laminates like R-8705 can be punch-processed at or near room temperature, dramatically lowering tooling cycle times for simple board geometries.

Thermal Properties

Property	Typical Value
Glass Transition Temperature (Tg)	~105 – 115°C
Flammability Rating	UL 94 V-0 (standard grade)
Continuous Operating Temperature	≤105°C
Solder Resistance (288°C, 10 sec)	Acceptable

The Tg is on the lower end compared to FR-4’s typical 130–170°C range. This matters for your assembly process: if you’re running lead-free reflow at 260°C peak, R-8705 is not appropriate. It’s designed primarily for wave soldering or selective soldering of through-hole components, which keeps the board exposure below its thermal limit.

Available Copper Foil Thickness

Standard copper weights for R-8705 are 1 oz (35 µm) and 2 oz (70 µm), with 0.5 oz available on request for specific thicknesses. Board thickness typically ranges from 0.8 mm to 2.4 mm, with 1.6 mm being the most commonly stocked.

Key Advantages of R-8705 That Actually Matter in Production

From a fabrication standpoint, a few properties of the Panasonic R-8705 PCB material stand out beyond what the spec sheet conveys.

Excellent tracking resistance is the headline claim Panasonic makes for this series, and it holds up. Tracking resistance refers to the material’s ability to resist the formation of a conductive carbon path across its surface under high-voltage stress. For appliance boards operating near line voltage, this is not a theoretical concern — it’s a UL/IEC compliance requirement, and R-8705 delivers in that area.

Dimensional stability for punching is the other practical win. In high-volume remote control PCB production or simple motor-driver boards, punching rather than routing can cut unit costs meaningfully. The paper fiber structure of R-8705 absorbs mechanical shock during the punch cycle rather than cracking or delaminating.

Long shelf life is another underrated benefit. The phenolic resin system is less hygroscopic than some alternatives when stored properly, and Panasonic’s paper phenolic boards have a well-established record of stable shelf performance.

Typical Applications for Panasonic R-8705

Given its properties, the R-8705 fits cleanly into a defined set of application categories:

Application Category	Specific Products
Home Appliances	Air conditioners, washing machine controllers, microwave ovens
Consumer Electronics	Remote controls, DVD players, LCD TVs, audio equipment
Automotive Interior	In-vehicle instrument panels (non-safety-critical), motor controls
IT Peripherals	Keyboards, LCD backlighting control boards
Industrial / Motor Control	Small relay driver boards, fan control PCBs

What’s absent from that list is equally instructive. You won’t find R-8705 in RF front-ends, high-speed data paths, power amplifiers, or anything that runs above ~50 MHz with performance-critical signals. The material simply doesn’t have the electrical stability for those uses.

R-8705 vs FR-4: Choosing the Right Material

Engineers frequently face the R-8705 vs FR-4 decision for double-sided consumer boards. Here’s a direct comparison:

Parameter	Panasonic R-8705	Standard FR-4
Material Base	Paper phenolic	Woven glass epoxy
Tg	~110°C	130–170°C
Dielectric Constant	4.5–5.0	4.2–4.8
Dissipation Factor	0.030–0.045	0.015–0.025
Punchability	Yes (room temp)	No (must drill/route)
Moisture Absorption	Moderate (~0.8%)	Low (~0.15%)
Material Cost	Lower	Higher
Lead-Free Reflow Compatibility	Limited	Yes
Suitable for High Frequency	No	Limited

The cost advantage of R-8705 over FR-4 is real and consistent. For a remote control board or a simple household appliance controller where there’s no lead-free reflow requirement and signal frequencies are below 10 MHz, R-8705 is the rational choice.

Where to Source and Download the Datasheet

The R-8705 is not universally stocked by every distributor, but it’s accessible through the following channels:

Resource	Link / Contact
Panasonic Industrial (Official Product Page)	https://industrial.panasonic.com/ww/products/pt/paper-phenolic
Panasonic Product Inquiry / Quote Request	Via Panasonic Industrial contact portal (region-specific)
PCB Directory	https://www.pcbdirectory.com — search R-8705
IPC Laminate Standards Reference	IPC-4101 (Specification for Base Materials for Rigid and Multilayer Printed Boards)
NEMA Standards (Laminate Grades FR-1, FR-2, XPC)	Available via NEMA.org

For fabricators working with Panasonic PCB materials, it’s worth requesting the full technical data sheet directly from the manufacturer, as some specific lot-to-lot property ranges are only disclosed in the document package sent upon formal inquiry.

Frequently Asked Questions About Panasonic R-8705 PCB Material

Q1: What is the difference between R-8700 and R-8705? R-8700 is single-sided copper clad, meaning copper foil is bonded to only one face of the laminate. R-8705 is double-sided, with copper on both surfaces, enabling routing of circuitry on both layers. For designs requiring any signal crossover or ground plane on the back side, R-8705 is the correct choice.

Q2: Can R-8705 handle lead-free (ROHS-compliant) assembly processes? Generally, no. Standard R-8705 has a Tg in the 105–115°C range, which is insufficient for lead-free reflow peak temperatures of around 260°C. If your design requires lead-free processing, specify the R-8705EF or R-8705EJ variant with enhanced heat resistance, or reconsider FR-4.

Q3: What NEMA or IPC grade does R-8705 correspond to? The R-8700 series aligns most closely with FR-2 under IPC-4101 — a flame-retardant paper phenolic grade with good electrical properties. It is distinct from XPC (which lacks the flame-retardant system) and from FR-1 (which has slightly lower electrical performance).

Q4: Is punching the only way to process R-8705, or can it be routed? You can route R-8705 using standard PCB routing equipment. Punching is a cost-efficient option for high-volume simple geometries, not a fabrication requirement. For prototypes or complex outlines, CNC routing works perfectly well.

Q5: Where does R-8705 fit in Panasonic’s overall PCB material portfolio? R-8705 occupies the entry-level, high-volume tier of Panasonic’s circuit board material lineup. Above it sit the glass epoxy grades (standard FR-4 class), then the glass composite CEM-3 series, and at the top end, the MEGTRON family for high-speed/high-frequency applications. R-8705 is intentionally positioned for cost-sensitive, low-frequency designs — it’s not a compromise, it’s the right tool for the right job.

For engineering inquiries, sample requests, and regional pricing on Panasonic R-8705 PCB material, contact Panasonic Industry directly through their regional industrial products portal.

Panasonic R-8700 paper phenolic PCB material: complete guide covering electrical and thermal properties, application areas, FR4 cost comparison, fabrication tips, and IPC compliance data for PCB engineers and designers.

What Is the Panasonic R-8700 Paper Phenolic PCB Material?

If you’ve spent any time sourcing substrate materials for cost-sensitive, single-sided PCB designs, you’ve probably come across the Panasonic R-8700. It sits in a category of laminate that gets overlooked in favor of FR4 in most engineering conversations, but for the right application, it genuinely outperforms the alternatives on cost, weight, and punchability — three things that matter enormously in high-volume consumer electronics manufacturing.

The Panasonic R-8700 paper phenolic PCB material is a copper-clad laminate built on a paper substrate impregnated with phenolic resin. It is made of phenolic polymers and wood fibers, forming the base of the substrate. RAYPCB The finished board is typically brown in color — which is the easiest visual identifier on the shop floor — and it complies with the FR-1 or FR-2 classification under IPC-4101 standards. Panasonic also offers a closely related variant, the R-8705, in the same product family.

As a PCB engineer, what you need to know upfront is this: the R-8700 is not a high-speed, high-reliability material. It’s a workhorse for single-sided, low-frequency boards where the bill of materials needs to stay lean. Understanding exactly where it fits saves you from both over-engineering and under-specifying your board.

Key Electrical and Thermal Properties of the R-8700

The R-8700 offers distinct electrical and thermal properties that are responsible for its performance in specific applications. It features a low Dk (dielectric constant) and low Df (dissipation factor) value, which makes it suitable for signal-integrity-sensitive low-frequency applications. RAYPCB

The table below summarizes the typical property profile for the Panasonic R-8700, cross-referenced against the FR-1 and FR-2 specification ranges:

Property	Panasonic R-8700 (Typical)	FR-1 Standard Range	FR-2 Standard Range
Glass Transition Temp (Tg)	~130°C	105–130°C	105°C
Dielectric Constant (Dk) at 1 MHz	~4.5	3.5–5.5	3.5–5.5
Dissipation Factor (Df)	Low	Moderate	Moderate
Flammability Rating	UL 94 V-0	UL 94 V-0	UL 94 V-0
Water Absorption	Low	Moderate	Moderate
Color	Brown	Brown	Brown
Max Operating Temperature	~105°C	105°C	105°C
Halogen Content	Halogen-free	Varies	Varies

A few things jump out here from a design standpoint. First, the halogen-free status is a meaningful differentiator. The R-8700 laminate is completely free of halogen, which is especially important for PCBs used in communication networks where freedom from halogen constituents is required for environmental protection compliance. RAYPCB That keeps it aligned with RoHS and REACH directives without any additional material substitution effort.

Second, the low water absorption characteristic is more practically useful than engineers often give it credit for. In high-humidity environments or tropical supply chains, a board that resists moisture uptake during storage and assembly reduces delamination risk significantly.

Mechanical Properties Worth Knowing

Paper-reinforced phenolic is an exceptionally tough board made from wood fibre and phenolic polymers. Grade X material variants result in laminates with high impact resistance, excellent tensile, compressive, and flexural strengths. Emco Industrial Plastics However, it’s worth noting that these mechanical advantages come with a caveat: it is not recommended for applications where electrical properties are important and humidity is high. Emco Industrial Plastics

The R-8700 is specifically optimized for the punching process. In mass production, this is critical. Die-punching holes rather than drilling them is dramatically faster and cheaper, and phenolic paper laminates handle this process far better than glass-epoxy alternatives. Panasonic R-8700 offers great punching resistance at very low temperatures, RAYPCB which means your tooling doesn’t need cold-state conditioning to maintain dimensional accuracy during stamping operations.

Where Is Panasonic R-8700 Actually Used?

The application footprint for the R-8700 is well-defined. It’s not a universal substrate, but where it fits, it fits extremely well.

Typical end markets include LCD TVs, DVDs, audio equipment, home appliances, in-vehicle instrument panels, motors, and remote controls. Panasonic

Here’s a more structured view of its application landscape:

Application Segment	Specific Use Cases	Why R-8700 Works Here
Consumer Electronics	Remote controls, calculators, toys	Low-frequency signals, cost sensitivity, single layer
Home Appliances	Washing machines, air conditioner controllers	High-volume punching, thermal durability
Automotive (Interior)	Instrument panels, motor control boards	Lightweight, punching-compatible
IT Peripherals	Keyboards, LCD interface boards	High signal integrity for low-speed data RAYPCB
Audio/AV Equipment	DVDs, amplifier control boards	Low Dk/Df for signal clarity at low frequency
Industrial Devices	Sensor boards, relay panels	Non-porous, chemically resistant

This PCB material is ideal for use in consumer electronics like telephones, TVs, and calculators, and also appears in DVDs, remote controls, and in-vehicle instruments. RAYPCB The automotive interior application is particularly interesting — not the engine bay, obviously, but instrument panels and HVAC controls where temperature extremes are moderate and the priority is low cost and low weight.

When Not to Use R-8700

Let me be direct about this. The R-8700 is a single-sided board material. FR1 and FR2 are usually used for 1-layer PCBs because they are not good for passing through holes. Pcbandassembly If your design involves any plated through-holes, blind vias, or multilayer stack-ups, you need to move to FR4 or a higher-grade laminate immediately. Trying to drill phenolic paper for PTH components produces poor hole wall quality, and the material simply isn’t built for the plating chemistry involved.

Also avoid it for any RF or high-speed digital design. The dielectric properties, while acceptable at audio and low-frequency ranges, become a liability above a few hundred MHz.

Panasonic R-8700 vs FR4 vs Competing Paper Phenolic Materials

This is where the practical engineering decision lives. Understanding the cost-performance tradeoff across material types helps you justify the material selection to procurement teams and program managers.

Parameter	Panasonic R-8700 (FR-1/FR-2)	Standard FR4	CEM-1 (Composite)
Base Material	Paper + Phenolic Resin	Woven Glass + Epoxy	Paper Core + Glass Surface
Tg (°C)	~130	130–180 (standard/high-Tg)	120–130
Max Layers	1 (practical)	1–40+	1–2
Drilling/PTH	Not recommended	Excellent	Limited
Punching Capability	Excellent	Poor	Moderate
Relative Material Cost	★ (Lowest)	★★★	★★
Moisture Resistance	Good (R-8700 low absorption)	Very Good	Moderate
Halogen-Free Option	Yes (R-8700)	Yes (variants)	Limited
UL Flame Rating	V-0	V-0	V-0
Typical Applications	Consumer, remote controls	Motherboards, industrial	Mid-range consumer

FR1 and FR2 materials represent the same cost level, and costs across the full FR range can differ by 10% to 100% compared to FR4. OurPCB In high-volume production runs — think millions of remote controls per month — that cost difference directly determines product margin. FR1 and FR2 are low-cost options for simple boards, while FR4 offers the best all-around performance, making it the most widely used material in modern PCB manufacturing. GlobalWellPCBA

Where the R-8700 Beats Competitors

What differentiates the R-8700 from generic paper phenolic laminates comes down to Panasonic’s quality controls and material consistency. In mass production environments, laminate thickness variation and copper adhesion consistency are board-level defect drivers. Panasonic’s manufacturing pedigree, combined with the halogen-free formulation, gives the R-8700 a measurable edge over commodity phenolic laminates from lower-tier suppliers when you’re qualifying a supply chain that needs to meet RoHS and REACH with minimal audit overhead.

Panasonic PCB material qualifications are also well-documented and recognized by major EMS providers globally, which reduces time-to-qualification when you’re setting up a new manufacturing line.

Processing and Fabrication Guidelines for R-8700

Knowing how to fabricate the R-8700 correctly is as important as understanding the material properties. Here are the key processing points:

Punching vs. Drilling: The primary benefit of this material in production is the ability to punch rather than drill. Cold-state punching at temperatures down to around 0°C is achievable. Die sets need to be maintained and aligned carefully since phenolic paper is brittle at the edges when the punch tooling is worn.

Copper Weight: The R-8700 is available in standard copper weights suited for single-sided designs, typically 18µm (½ oz) to 35µm (1 oz). For current-carrying traces in appliance control boards, 35µm is usually the appropriate specification.

Solder Compatibility: The material supports wave soldering for through-hole components, but the solder temperature and dwell time must be controlled tightly. Phenolic paper laminates can delaminate if thermal shock is applied aggressively during hand-soldering rework.

Surface Finish: HASL (Hot Air Solder Leveling) is the standard finish pairing for this material. ENIG (Electroless Nickel Immersion Gold) is typically cost-prohibitive for the applications where R-8700 is used.

Storage: The R-8700 features low water absorption, RAYPCB but storage in dry, controlled environments (below 50% relative humidity) is still recommended, especially before wave soldering, to avoid steam-driven delamination.

Environmental Compliance and Sustainability Angle

The R-8700 laminate is completely free of halogen. RAYPCB This is worth highlighting separately because in many paper phenolic products from older or lower-cost sources, brominated flame retardants are still present. The halogen-free formulation in the R-8700 aligns it with current European RoHS directives and REACH regulations without any workaround or exemption dependency.

For OEMs shipping into the EU market, this directly simplifies compliance documentation. It also reduces concern around thermal decomposition products during manufacturing — phenolic resins in general are known to release trace organic compounds under high heat, and halogen-free formulations keep those decomposition byproducts substantially cleaner.

5 FAQs About Panasonic R-8700 Paper Phenolic PCB

Q1: Is the Panasonic R-8700 the same as FR4?

No. The R-8700 is a paper-based phenolic laminate classified under FR-1/FR-2 grades, while FR4 uses woven fiberglass cloth with an epoxy resin binder. FR4 integrates epoxy with woven glass fabric for superior durability, Aivon making it suitable for multilayer designs and high-temperature environments. The R-8700 is optimized for single-sided, cost-sensitive, low-frequency applications.

Q2: Can I use the Panasonic R-8700 for double-sided or multilayer PCBs?

Technically you can produce a double-sided board, but FR1 and FR2 materials are not good for passing through holes, Pcbandassembly which severely limits functional double-sided utility. For any design requiring interlayer connections, FR4 is the correct choice.

Q3: What is the operating temperature range of the R-8700?

The R-8700 is resistant to low and high temperatures. RAYPCB Its glass transition temperature is approximately 130°C, and practical continuous operating temperature is up to around 105°C, consistent with FR-1 classification. It is not suited for environments exceeding this range.

Q4: Is the R-8700 RoHS and REACH compliant?

Yes. The halogen-free formulation of the R-8700 makes it compliant with RoHS and REACH requirements without requiring substitution analysis for bromine or chlorine-based flame retardants. Always obtain the current compliance documentation from Panasonic’s electronic materials portal before each procurement cycle, as compliance data is subject to revision.

Q5: How does the R-8700 compare in price to FR4?

FR1 is the least expensive of the four materials, followed by FR2 and FR3, with FR4 being the costlier option. PCBMay In practical terms for high-volume single-sided designs, the R-8700 can reduce raw laminate costs meaningfully compared to FR4, which is a significant margin driver at scale. The total cost benefit also includes faster punching cycles versus drill-based FR4 hole formation.

Useful Resources for Engineers Working With R-8700

Resource	Description	Link
Panasonic Electronic Materials Portal	Official product page for R-8700 and R-8705 with downloadable catalog	industrial.panasonic.com
Panasonic R-8700 Catalog PDF	Technical catalog (cbmcatalog_2302_r8700ef.pdf)	Download from Panasonic
IPC-4101 Laminate Standard	Specification for base materials for rigid and multilayer printed boards	IPC.org
UL 94 Flammability Standard	UL flammability classification reference	UL.com
RayPCB Panasonic PCB Guide	Fabrication guidance for Panasonic PCB materials	raypcb.com/Panasonic-pcb/
Wikipedia: Phenolic Paper	Background reference on phenolic paper PCB grades	Wikipedia

Final Thoughts: Is the Panasonic R-8700 Still Relevant in 2024?

Absolutely — but only in its lane. The Panasonic R-8700 paper phenolic PCB is not a legacy material trying to survive; it’s a purpose-built laminate that remains the most cost-effective and processing-efficient substrate for single-sided, low-frequency, high-volume boards. Remote controls, appliance controllers, audio equipment, and in-vehicle interior electronics are still manufactured in the hundreds of millions annually, and for all of them, the R-8700 is a legitimate first-choice laminate.

Where engineers get into trouble is trying to stretch phenolic paper beyond its design envelope — adding via structures, pushing operating temperatures, or running high-speed signals through it. Stay within its specifications and you have a material that delivers long service life, good mechanical performance during assembly, halogen-free compliance, and the lowest raw material cost in the rigid laminate family.

For any new design targeting these application segments, the R-8700 deserves a place in your initial material selection matrix alongside FR4 and CEM-1, evaluated against the full cost of ownership including fabrication method, compliance overhead, and finished board weight.

Suggested Meta Description

Panasonic R-8700 paper phenolic PCB material: complete guide covering electrical and thermal properties, application areas, FR4 cost comparison, fabrication tips, and IPC compliance data for PCB engineers and designers.

Panasonic R-5795U PCB material (MEGTRON 8) delivers ultra-low loss performance for 800GbE and AI systems. Explore specs, stackup design tips, comparisons, and engineering insights.

SEO Outline (Engineer-Oriented, Based on Industry Content Patterns)

Introduction: Why ultra-low loss PCB materials matter for 800G

What is Panasonic R-5795U PCB material?

Key electrical and thermal properties (table)

Why MEGTRON 8 is built for 800GbE & AI infrastructure

Loss mechanisms in high-speed PCB design (engineer insight)

MEGTRON 8 vs MEGTRON 7 vs FR-4 (comparison table)

Stackup design considerations using R-5795U

Manufacturing and reliability considerations

Real-world applications (AI servers, routers, optics)

Useful resources & datasheets

FAQs

Conclusion + meta description

Panasonic R-5795U PCB Material: A Practical Engineer’s Guide for 800G Design

When you start designing for 112G PAM4 or stepping into 800GbE architectures, PCB material is no longer a background decision—it becomes a system-level constraint.

The Panasonic R-5795U PCB material (MEGTRON 8 series) is one of the few laminates specifically engineered for ultra-low transmission loss in high-speed networking platforms. If you’re working on switch ASIC breakouts, co-packaged optics, or AI backplanes, this material is worth serious consideration.

What is Panasonic R-5795U PCB Material?

The Panasonic R-5795U PCB material is part of the MEGTRON 8 family—Panasonic’s latest generation of ultra-low loss laminates designed for next-generation communication systems.

It is optimized for:

800GbE networking

AI/ML server platforms

High-speed optical modules

Advanced test and probe systems

Panasonic engineered MEGTRON 8 to deliver ~30% lower transmission loss compared to MEGTRON 7, enabling higher data rates and reduced power consumption.

Key Electrical & Thermal Properties of Panasonic R-5795U

Below is a consolidated engineering table based on datasheet values:

Property	Value	Engineer Insight
Dielectric Constant (Dk @14GHz)	~3.08	Enables controlled impedance with wider traces
Dissipation Factor (Df @14GHz)	~0.0012	Critical for 112G PAM4 channel budgets
Glass Transition Temp (Tg, DMA)	220°C	Stable under multiple reflow cycles
Thermal Decomposition (Td)	370°C	High reliability for dense multilayer boards
CTE (X/Y)	17–20 ppm/°C	Matches copper well → reduces stress
CTE (Z-axis)	50–270 ppm/°C	Important for via reliability
Water Absorption	0.06%	Good for signal stability in humid environments
Flammability	UL94 V-0	Standard compliance

Source data compiled from Panasonic technical documentation.

Why Panasonic R-5795U PCB Material is Built for 800GbE

From a signal integrity perspective, 800G is not just “faster 400G”—it’s a different regime:

1. Channel Loss Budget is Brutal

At 112G PAM4:

Total insertion loss budget is extremely tight

Even small dielectric losses dominate

MEGTRON 8 addresses this with industry-leading low transmission loss, enabling longer trace routing without retimers.

2. Power Efficiency Matters

Lower dielectric loss directly translates to:

Reduced SerDes power

Lower cooling requirements

This becomes critical in AI clusters where power density is already extreme.

3. High-Layer Count Compatibility

MEGTRON 8 supports 20+ layer stackups without sacrificing reliability or manufacturability.

Understanding Loss Mechanisms (Engineer Perspective)

In real designs, total channel loss includes:

Dielectric loss → dominated by Df

Conductor loss → copper roughness + skin effect

Via loss → stub resonance

Connector loss

The Panasonic R-5795U PCB material specifically targets dielectric loss—the only one you can significantly reduce at the material level.

Practical takeaway:

If your insertion loss is failing margin at Nyquist, upgrading laminate often gives more benefit than tweaking trace geometry.

MEGTRON 8 vs MEGTRON 7 vs FR-4

Here’s a practical comparison from a design engineer standpoint:

Parameter	MEGTRON 8 (R-5795U)	MEGTRON 7	Standard FR-4
Dk	~3.08	~3.3–3.5	~4.2–4.5
Df	~0.0012	~0.002	~0.01–0.02
Loss Performance	Ultra-low	Very low	High
Frequency Range	Up to 40 GHz+	High-speed	Limited
Target Use	800G / AI	400G / HPC	General electronics
Cost	Very high	High	Low

MEGTRON 8 is clearly positioned as “no-compromise SI performance” material, especially for hyperscale infrastructure.

Stackup Design Considerations with R-5795U

From real-world experience, switching to Panasonic R-5795U PCB material impacts stackup decisions:

1. Wider Trace Geometry

Lower Dk allows:

Wider traces for same impedance

Reduced conductor loss

2. Glass Weave Effects

At high speeds:

Fiber weave skew becomes visible

Choose spread glass styles carefully

3. Copper Foil Selection

To fully benefit:

Use HVLP or VLP copper

Avoid standard rough copper

4. Via Design

Backdrilling is still mandatory

Consider via-in-pad for dense breakout

Manufacturing & Reliability Considerations

One advantage of MEGTRON 8:

Compatible with standard multilayer PCB processes 

No exotic processing required

Similar handling to earlier MEGTRON generations

However, keep in mind:

Lamination cycles increase cost

Material availability can affect lead time

Tight process control required for impedance

Real Applications of Panasonic R-5795U PCB Material

Typical deployments include:

Core network switches (800G Ethernet)

AI training clusters (GPU backplanes)

Optical modules and transceivers

High-speed test equipment

Semiconductor probe cards

These systems demand:

Low jitter

Minimal insertion loss

Thermal reliability

Useful Resources for Engineers

Here are some practical resources:

Panasonic official datasheet (R-5795U PDF)

MEGTRON 8 product overview

IPC-TM-650 test standards

High-speed PCB design guidelines

�� Recommended guide:

Panasonic PCB Material Guide

This resource gives a broader comparison across MEGTRON families and practical use cases.

FAQs About Panasonic R-5795U PCB Material

1. Is R-5795U necessary for 800G designs?

Not always—but if your channel loss exceeds margin, it becomes one of the most effective fixes.

2. How does it compare to Rogers materials?

R-5795U offers similar low-loss performance but with better multilayer manufacturability for large PCBs.

3. Can I replace MEGTRON 7 directly?

Yes, but stackup re-optimization is recommended due to Dk differences.

4. Does it reduce power consumption?

Yes—lower dielectric loss reduces equalization and SerDes power.

5. What is the biggest downside?

Cost. This is a premium material used only where performance justifies it.

Final Thoughts (Engineer’s Perspective)

The Panasonic R-5795U PCB material is not just another incremental improvement—it reflects a shift in PCB design priorities driven by AI and hyperscale networking.

In older designs, material selection was secondary.
In 800G systems, it directly determines whether your channel even works.

If you’re designing:

112G PAM4 links

Long backplane channels

High-density AI interconnects

Then MEGTRON 8 is not overkill—it’s often the baseline.

Suggested Meta Description

Panasonic R-5795U PCB material (MEGTRON 8) delivers ultra-low loss performance for 800GbE and AI systems. Explore specs, stackup design tips, comparisons, and engineering insights.

Discover the complete specification guide for Panasonic R-5795N laminate — a low-Dk glass cloth PCB material ideal for high-frequency applications. Learn key features, technical specs, manufacturing tips, and where to source datasheets to optimize your PCB designs.

If you’re searching for a reliable, low-Dk (dielectric constant) glass cloth laminate for high-frequency, high-reliability printed circuit board (PCB) applications, the Panasonic R-5795N laminate is a top contender. Used widely in RF/microwave and multilayer PCBs, this material offers a unique balance of electrical performance, mechanical robustness, and manufacturability — critical factors for advanced PCB fabrication.

In this article, we’ll dive deep into what makes Panasonic R-5795N special, explore its technical specs in detail, and provide practical insights on how and why to use it for your next PCB project.

Table of Contents

What is Panasonic R-5795N Laminate?

Key Features and Benefits

Detailed Technical Specifications

Comparative Analysis with Other Low-Dk Materials

Typical Applications and Use Cases

Manufacturing Considerations

Resources and Data Sheet Downloads

FAQs on Panasonic R-5795N Laminate

Conclusion

What is Panasonic R-5795N Laminate?

The Panasonic R-5795N laminate is a low-Dk glass cloth reinforced epoxy resin laminate designed specifically to meet rigorous demands for high-frequency circuit boards. Manufactured with proprietary Panasonic materials technology, it achieves a dielectric constant (Dk) typically around 3.3 to 3.4 — ideal for minimizing signal loss and phase delay in RF/microwave circuits.

This material offers excellent electrical insulation properties combined with a relatively low loss tangent (Df), ensuring signals maintain integrity over long traces or densely packed transmission lines.

Most importantly for PCB fabricators and design engineers, Panasonic R-5795N laminate provides dimensional stability and excellent thermal resistance for multilayer constructions, meeting industry standards for reliability.

Key Features and Benefits of Panasonic R-5795N Laminate

Feature	Specification / Description	Value to Engineers
Dielectric Constant (Dk)	3.28 to 3.42 (measured at 10 GHz)	Low signal delay, ideal for high-frequency signals
Dissipation Factor (Df)	~0.0045 at 10 GHz	Low signal loss for better RF performance
Glass Transition Temperature (Tg)	>130°C	Good thermal stability during soldering
Prepreg and Copper Clad Options	Available	Flexible use for inner and outer layers
Tg Measurement Method	DSC (Differential Scanning Calorimetry)	Reliable thermal characteristic data
Thermal Expansion (CTE)	X/Y: ~15 – 18 ppm/°C, Z-axis: 60 ppm/°C	Predictable expansion for multilayers
Mechanical Strength	High flexural strength, good peel strength	Durable during manufacturing and in-field use
Compatible Copper Foils	Electrodeposited, rolled annealed copper	Enables fine feature fabrication
UL Flammability Rating	UL 94 V-0	Meets safety and industry compliance

Detailed Technical Specifications of Panasonic R-5795N Laminate

Engineers working on demanding PCB designs will appreciate the comprehensive technical profile of Panasonic R-5795N.

Parameter	Typical Value	Test Conditions / Standard	Explanation
Dielectric Constant (Dk)	3.3 (typical)	IPC-TM-650 test method 22.214.171.124 (10 GHz)	Low Dk reduces signal dispersion in high-speed lines
Dissipation Factor (Df)	0.0045	IPC-TM-650 126.96.36.199 at 10 GHz	Lower dissipation reduces RF insertion loss
Glass Transition Temp. (Tg)	130°C (minimum)	DSC Method	Ensures dimensional stability during thermal cycling
Thermal Conductivity	~0.3 W/mK	ASTM D5470	Influences heat dissipation in multilayer stack
Coefficient of Thermal Expansion	X/Y: 15 ppm/°C, Z: 60 ppm/°C	IPC-TM-650 2.4.24	Thermal dimensional stability critical for reliability
Water Absorption	<0.1%	IPC-TM-650 188.8.131.52	Limits moisture-induced dielectric property shifts
Copper Peel Strength	>1.0 N/mm	IPC-TM-650 2.4.8	Ensures solid copper-clad laminates maintain integrity
Flammability	UL 94 V-0	UL Certification	Vital for safety compliance

Panasonic R-5795N vs Competitors: How It Stacks Up

Choosing the right low-Dk laminate can be daunting given multiple options like Rogers RO4000 series, Isola I-370HR, Nelco N4000-13, etc. Here’s how Panasonic R-5795N compares in key parameters.

Property	Panasonic R-5795N	Rogers RO4350B	Isola I-370HR	Nelco N4000-13
Dielectric Constant	3.3 (10 GHz)	3.48 (10 GHz)	3.3 (10 GHz)	3.3 (10 GHz)
Dissipation Factor	0.0045	0.0037	0.0042	0.004
Tg	≥130°C	280°C	180°C	140°C
Thermal Expansion (XY)	15-18 ppm/°C	16 ppm/°C	18 ppm/°C	15 ppm/°C
Water Absorption	<0.1%	<0.04%	<0.2%	<0.05%
Copper Peel Strength	>1.0 N/mm	>1.2 N/mm	>1.0 N/mm	>1.1 N/mm

Insight: Panasonic R-5795N balances a moderately low dissipation factor with great thermal and mechanical stability, making it an economical alternative for many high-frequency PCB applications that don’t require ultra-high Tg.

Typical Applications for Panasonic R-5795N Laminate

Understanding where Panasonic R-5795N delivers maximal ROI is key for engineers specifying materials for multilayer and high-speed PCBs:

RF/Microwave circuits

5G communication modules

IoT antennas and sensors

Automotive radars and sensors

Aerospace and defense electronics

Base stations and network infrastructure

High-speed digital PCBs where controlled impedance is critical

Its combination of consistent dielectric properties, thermal robustness, and mechanical durability makes it the preferred choice for complex multilayer PCB stacks used in demanding, high-frequency environments.

Manufacturing Considerations for Panasonic R-5795N

When fabricating PCBs with Panasonic R-5795N laminate, some process parameters and best practices should be kept in mind:

Lamination: Follow recommended dwell times and temperatures (about 180 °C) to avoid delamination or voids. Panasonic provides detailed lamination curves in data sheets.

Etching and Drilling: The glass cloth weave might influence tooling wear; use carbide or diamond-coated drills for longevity.

Soldering: Tg of 130°C supports lead-free reflow profiles but avoid excessive thermal cycling to preserve layer integrity.

Storage: Keep dry and sealed to avoid moisture uptake which impacts dielectric and mechanical properties.

Copper Clad Selection: Compatible with standard RTF (Rolled or ED Copper Foil) for ease of patterning fine-lines.

For tailored manufacturing advice, consulting Panasonic’s technical support or your lamination fabricator is essential.

Useful Resources and Data Sheet Downloads

For a deeper technical dive, sample ordering, or procurement, these official and third-party resources can help:

Resource Name	Description	Link / Source
Panasonic R-5795N Datasheet	Official detailed datasheet with specs	Download here (example link; verify correctness)
IPC-4101 Standard	Laminates, Prepregs, Service Conditions	IPC association
Panasonic PCB Solutions	PCB fabrication and laminate info	Panasonic PCB
Rogers Corporation Website	Market competitor info and materials guide	rogerscorp.com
PCB Design for HF Signals	Whitepaper on laminate choices and design	Various PCB design communities

Make sure you download the latest revision datasheets directly from Panasonic’s industrial materials webpage or official distributors.

FAQs on Panasonic R-5795N Laminate

1. What dielectric constant does Panasonic R-5795N offer?

Typical dielectric constant is around 3.3 at 10 GHz, making it suitable for RF/microwave designs.

2. Is R-5795N suitable for multilayer PCB fabrication?

Yes, its thermal and mechanical properties ensure excellent dimensional stability for multilayer builds.

3. How does R-5795N compare to Rogers laminates?

It offers a competitive low Dk and Df at a more affordable price point but with lower Tg compared to premium Rogers materials.

4. Can I use Panasonic R-5795N for automotive electronics?

Absolutely, due to its thermal stability and flame-retardant rating, it’s commonly used in automotive radar and sensor PCBs.

5. Where can I get Panasonic R-5795N material samples or datasheets?

Official Panasonic distributors or PCB fabrication partners generally provide samples; datasheets are downloadable from Panasonic’s industrial materials website.

Conclusion

For PCB engineers optimizing high-frequency circuits, the Panasonic R-5795N laminate offers a compelling low dielectric, low loss option with proven thermal/mechanical stability and cost-effectiveness. Its wide acceptance across RF, telecom, automotive, and aerospace fields testifies to its versatility.

Whether you’re designing multilayer PCBs for 5G infrastructure, IoT modules, or automotive radar systems, Panasonic R-5795N stands out as a balanced performer blending signal integrity, reliability, and manufacturability.

Before finalizing material selection, always review the latest data sheets, consult fabrication partners, and prototype early to validate performance in your specific use case.

For additional information, refer to the Panasonic PCB resource page which provides more design insights and supply chain connections.

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Discover the complete specification guide for Panasonic R-5795N laminate — a low-Dk glass cloth PCB material ideal for high-frequency applications. Learn key features, technical specs, manufacturing tips, and where to source datasheets to optimize your PCB designs.

Explore the Panasonic R-5375N halogen-free MEGTRON 6 PCB material — low Dk performance, thermal/stackup guidance, environmental benefits, and design insights for high-speed multilayer electronics.

The Panasonic R–5375N halogen–free MEGTRON 6 laminate represents a major step forward in eco-friendly, high-performance rigid PCB materials tailored for the most demanding communication infrastructure and high-speed digital applications. This guide dives into material properties, thermal performance, environmental impact, electrical characteristics, stack-up design considerations, comparative tables, useful resources, and questions PCB engineers care about most.

Table of Contents

Introduction: Why Panasonic R–5375N halogen–free MEGTRON 6 Matters

What Is Halogen-Free MEGTRON 6?

Essential Material Properties and Specs

Electrical Characteristics: Dk, Df, Frequency Response

Thermal and Mechanical Performance

Environmental and Safety Advantages of Halogen-Free Laminate

Design and Stack-Up Tips for High-Speed and High-Layer Boards

Typical Applications Suited to R-5375N

Comparative Tables: MEGTRON Families

Useful Resources for Further Reference

Frequently Asked Questions

Conclusion

Suggested Meta Description

1. Introduction: Why Panasonic R–5375N Halogen–Free MEGTRON 6 Matters

In today’s PCB engineering landscape, materials must not only meet electrical and thermal demands but also increasingly strict environmental and regulatory standards. The Panasonic R–5375N halogen–free MEGTRON 6 material takes the traditional strengths of MEGTRON 6 ultra-low loss laminates — excellent signal integrity, high heat resistance, and HDI compatibility — and couples them with halogen-free resin systems that support modern environmental requirements like RoHS and JPCA-ES-01-2003.

This makes it ideal for high-layer count boards in servers, routing and networking equipment, 5G infrastructure, optical systems, and advanced ICT gear where signal performance and safety compliance are both critical.

2. What Is Halogen–Free MEGTRON 6?

The MEGTRON 6 product line from Panasonic has long been an industry standard for high-speed, low-loss PCB materials. Panasonic expanded this family to include halogen–free variants — designed to significantly reduce the presence of halogen elements such as chlorine and bromine in the polymer resin. The R-5375(N) is the lowDk glass cloth type halogen–free laminate, paired typically with matching prepregs like R-5370(N).

Being halogen-free means the resin system is engineered without high levels of halogen flame retardants — a key environmental and safety consideration when designing PCBs for global markets.

3. Essential Material Properties and Specs

The Panasonic R–5375N halogen–free MEGTRON 6 material combines performance and green engineering. Typical general properties from official Panasonic data show:

Property	Typical Value	Test / Condition
Dielectric Constant (Dk) @13 GHz	3.36	Balanced Circular Disk Resonator (C-24/23/50)
Dissipation Factor (Df) @13 GHz	0.0029	Balanced C-24/23/50
Glass Transition Temperature (Tg)	~250 °C (DMA)	Dynamic Mechanical Analysis – 1 Hz
Thermal Decomposition Temp (Td)	~435 °C	Panasonic press info
T288 with Copper	>120 min	IPC-TM-650 standard
Z-axis CTE (α1)	~39 ppm/°C	IPC-TM-650
Z-axis CTE (α2)	~200 ppm/°C	IPC-TM-650
Peel Strength (1 oz)	~0.6 kN/m	IPC-TM-650 (H-VLP2 Copper)
Halogen Content (Cl & Br)	≤900 ppm each	JPCA-ES-01-2003 compliance

This combination of high Tg, low Dk/Df, and controlled CTE makes Panasonic R–5375N halogen–free MEGTRON 6 strong for high-frequency and high-layer applications — while also complying with stringent green standards for halogen content.

4. Electrical Characteristics: Dk, Df, Frequency Response

One of the standout traits of Panasonic’s R-5375N material is its electrical performance at high frequencies. PCB stackups targeting high-speed digital or analog RF signatures benefit from a material that maintains a stable dielectric constant across the frequency spectrum.

Dielectric Constant (Dk): ~3.36 at 13 GHz

Dissipation Factor (Df): ~0.0029 at 13 GHz

These values indicate very low signal loss and good controlled impedance predictability up to microwave bands. For engineers working on high-speed serial interfaces or RF backplanes, maintaining low Df at high GHz frequencies minimizes insertion loss — a key contributor to eye-diagram quality and signal integrity.

In practical terms, the lower Dk supports narrower trace widths for a given characteristic impedance, enabling denser routing without compromising SI (Signal Integrity).

5. Thermal and Mechanical Performance

The thermal stability and mechanical reliability of Panasonic R–5375N halogen–free MEGTRON 6 make it robust through assembly and field operation.

Thermal Highlights

High Tg (~250 °C): Supports lead-free reflow and multiple thermal cycles

High Td (~435 °C): Resists polymer degradation at elevated temperature

Long T288: Over 2 hours with copper, indicating strong resistance to delamination and heat stres

These thermal properties ensure the material can endure aggressive manufacturing sequences and elevated ambient conditions within datacenter and telecom equipment. The tight Z-axis CTE (coefficient of thermal expansion) also helps maintain plated through-hole integrity as boards thermally cycle.

6. Environmental and Safety Advantages of Halogen–Free Laminate

The “halogen-free” designation is more than marketing — it reflects a real chemical engineering choice.

What “Halogen–Free” Means

In Panasonic’s halogen-free MEGTRON materials, key halogen elements (chlorine and bromine) are tightly controlled below thresholds set by standards like JPCA–ES–01–2003:

Chlorine ≤ 900 ppm

Bromine ≤ 900 ppm

Combined ≤ 1500 ppm

This reduces the likelihood of toxic or corrosive halogen compounds forming during combustion or disposal, a key consideration for products sold in environmentally regulated regions.

Halogen–Free vs. Conventional Flame Retardants

Traditional flame retardants use halogen elements to suppress flame propagation. While effective, these materials can pose environmental and health challenges during manufacturing, use, or end-of-life disposal. Halogen-free laminates instead use alternative chemistries that achieve flame retardance without as much toxic by-product risk. (General industry context)

In many markets, especially EU and industrial sectors, adopting halogen-free PCB materials can simplify compliance and reduce regulatory burden.

7. Design and Stack–Up Tips for High–Speed and High–Layer Boards

Controlled Impedance and High–Speed Channels

When designing stackups using Panasonic R–5375N halogen–free MEGTRON 6, leverage its stable Dk to define tight controlled impedance targets (e.g., 50 Ω, 100 Ω differential). Use field-solver tools and real stack heights from fabricators to calibrate trace width/spacing for predictable SI. The lower and stable Df also contributes to reduced high-frequency insertion loss.

Managing CTE and Board Warpage

Match core and prepreg CTE values carefully to avoid warpage in multilayer boards. The given Z-axis CTE values (~39 ppm/°C / ~200 ppm/°C) can be used to model thermal stress with plated copper.

HDI and Laser Via Compatibility

The halogen-free resin system does not adversely affect HDI processes — it’s suitable for laser microvias and stacked via structures typical in high layer count boards.

Fabrication Collaboration

Work closely with your PCB manufacturer on:

Stack tolerances

Copper foil type and thickness

Laminate/prepreg sequence

Test coupons for impedance verification

Thermal profiles for reflow and press cycles

Early collaboration ensures designs are manufacturable and meet performance expectations.

8. Typical Applications Suited to R–5375N

The performance envelope of Panasonic R–5375N halogen–free MEGTRON 6 makes it ideal for:

Application Category	Why It Fits
Servers and High-End Computing	Low loss, tight SI
Telecom and 5G Infrastructure	Environmentally compliant, high data rates
Optical Networking Backplanes	High frequency performance
Wireless Base Stations & ICT Gear	Reliable across wide thermal range
High-Layer Count HDI Boards	Stable stackup integrity

Telecom equipment in particular faces both performance and regulatory requirements, making halogen-free low Dk materials a strategic selection.

9. Comparative Tables: MEGTRON Families

A comparison helps contextualize where R–5375N fits among Panasonic laminate offerings:

Dielectric & Process Comparison

Material	Halogen–Free?	Dk @ 13 GHz	Df @ 13 GHz	Tg	Notes
R–5375N (Low Dk)	Yes	3.36	0.0029	250 °C	Halogen-free, ultra-low loss
R-5375(E) (E-glass)	Yes	~3.66	~0.0037	250 °C	E glass version
R-5775(K)	No	~3.62	~0.0046	~210 °C	Standard MEGTRON6
R-5785(N) (MEGTRON7)	No	~3.4	Lower	High	Next gen, not halogen-free

This illustrates R-5375N’s balance of environmental compliance and performance.

10. Useful Resources for Further Reference

Engineers can find depth in the following:

Official Panasonic Halogen–Free MEGTRON6 Page – core details & parts listing

R–5375(N) / R–5370(N) Product Page – datasheets and performance tables

Detailed Panasonic Halogen–Free MEGTRON6 Catalog (PDF) – complete characteristics

Panasonic PCB Materials Explained (RayPCB) – broader material context + related families, including FELIOS & XPEDION series

Panasonic PCB Manufacturing Insight at https://www.raypcb.com/Panasonic-pcb/ — practical manufacturing view (not official site, but useful overview)

Additionally, stack-up calculators and field-solver libraries will help translate these material properties into actionable layout dimensions.

11. Frequently Asked Questions

1. What makes Panasonic R–5375N halogen–free MEGTRON 6 different from standard MEGTRON6?

It incorporates a halogen–free resin system, tightly controlling chlorine and bromine content to meet green standards without significantly compromising electrical or thermal performance.

2. Can this material support 5G base stations and networking gear?

Yes — its low transmission loss, high Tg, and environmental compliance make it well suited for communications infrastructure requiring both performance and regulatory compliance.

3. Is it suitable for high–layer count HDI boards?

Absolutely. R-5375N is engineered for excellent HDI compatibility with laser microvias and stacked via processes.

4. How does halogen–free impact PCB processing?

There’s no adverse effect on standard rigid PCB fabrication — it can be processed with conventional lamination, drilling, and plating. Early fab collaboration is still recommended.

5. Where can I find official Panasonic datasheets?

Panasonic’s industrial website hosts datasheets and catalogs for the halogen-free MEGTRON6 series, including R-5375(N).

12. Conclusion

For PCB engineers and designers working on environmentally compliant, high–speed digital, and high–layer PCB projects, Panasonic R–5375N halogen–free MEGTRON 6 offers a compelling blend of performance, reliability, and green credentials.

Its low Dk and Df translate into high signal fidelity and low loss transmission, while thermal robustness and controlled CTE support demanding multilayer and HDI board manufacturing. Adopting halogen-free materials like R-5375N also aligns with global regulatory trends toward safer electronics and reduced environmental impact.

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Explore the Panasonic R–5375N halogen–free MEGTRON 6 PCB material — low Dk performance, thermal/stackup guidance, environmental benefits, and design insights for high-speed multilayer electronics.

Explore Panasonic R-2400 thermal conductive film, designed for efficient PCB thermal management in xEV and industrial electronics. Learn specs, applications, and design tips to enhance power module reliability and performance.

Outline

Introduction to Panasonic R-2400 Thermal Conductive Film

Thermal Management Challenges in xEV and Industrial Electronics

Material Composition and Key Thermal Properties of Panasonic R-2400

Detailed Technical Specifications Table

Electrical and Mechanical Properties Overview

Application Domains: Electric Vehicles and Industrial Systems

Integration with PCB Designs and Assembly Processes

Competitive Comparison with Alternative Thermal Films

Best Practices for Design Engineers and Manufacturers

Useful Resources and Technical Datasheets

Frequently Asked Questions (FAQs)

Conclusion

1. Introduction to Panasonic R-2400 Thermal Conductive Film

Efficient thermal management is becoming a fundamental requirement in the design of PCBs for electrified vehicles (xEV) and demanding industrial equipment. Heat generated by power electronics, microcontrollers, and sensor arrays must be effectively dissipated to prevent thermal degradation and ensure system longevity.

The Panasonic R-2400 thermal conductive film provides a state-of-the-art solution engineered to improve heat transfer within multilayer PCB stackups, acting as a thermally conductive yet electrically insulating interface. This film integrates advanced thermally conductive fillers in a polymer matrix optimized for flexibility, process compatibility, and reliability, enabling innovative solutions in next-gen xEV power modules and industrial control boards.

2. Thermal Management Challenges in xEV and Industrial Electronics

In xEV and industrial applications, PCB substrates face several hurdles:

High power density components generating localized heat

Compact form factors limiting heatsink volume

Variable operating temperature ranges and harsh environments

Mechanical stress from vibration and thermal cycling

Demanding electrical insulation requirements alongside thermal conduction

Failure to manage these challenges leads to premature failure, signal integrity issues, and safety risks. The R-2400 thermal film addresses this by enhancing heat flow between layers and components without compromising electrical isolation.

3. Material Composition and Key Thermal Properties of Panasonic R-2400

Panasonic R-2400 consists of:

High-performance ceramic fillers (commonly alumina, boron nitride) engineered for optimized thermal conduction paths

Silicone-based polymer matrix providing flexibility and adhesion

Controlled thickness for precise stacking within PCB laminates

Excellent dielectric strength ensuring electrical isolation between heated components and conductive layers

This material balance delivers a unique combination of thermal conductivity, electrical insulation, mechanical compliance, and chemical stability.

4. Detailed Technical Specifications Table

Specification	Typical Value	Units	Remarks
Thermal Conductivity	2.4	W/m·K	Higher than typical FR4 laminates
Thickness Range	25 – 150	µm	Adjustable per application needs
Dielectric Strength	> 15	kV/mm	Robust insulation properties
Operating Temperature Range	-40 to +150	°C	Compatible with xEV/industrial environments
Volume Resistivity	> 10^14	Ω·cm	Excellent electrical resistance
Shore Hardness (00 scale)	35 – 45	Shore 00	Moderate flexibility
Coefficient of Thermal Expansion (CTE)	~30	ppm/°C	Matches common PCB substrates

5. Electrical and Mechanical Properties Overview

R-2400 offers:

Electrical isolation paramount in multi-power domain PCB stacks avoiding short circuits

Mechanical resilience beneficial during assembly, vibration, and thermal cycling

Stable dielectric constant and loss tangent supporting high-frequency industrial signals

Chemical resistance ensuring durability in varied environmental exposures

Property	Panasonic R-2400	Standard FR4	Typical Silicone Film
Thermal Conductivity	2.4 W/m·K	0.3 W/m·K	0.8 – 1.2 W/m·K
Dielectric Strength	> 15 kV/mm	~10 kV/mm	~8 kV/mm
Volume Resistivity	> 10^14 Ω·cm	> 10^14 Ω·cm	> 10^12 Ω·cm
Shore Hardness (00)	35 – 45	N/A	40 – 70
Flexibility	Moderate	Rigid	Flexible

6. Application Domains: Electric Vehicles and Industrial Systems

Electric Vehicles (xEV)

Battery Management Systems (BMS): Dissipates heat near IGBTs and MOSFET drivers ensuring safe battery operation

Power Inverters and Chargers: Maintains thermal balance for reliability and efficiency

Motor Controllers: Supports high-power switching ICs requiring precise thermal paths amid vibration and temperature extremes

Industrial Electronics

Factory Automation Controllers: Ensures thermal stability for PLCs and sensor electronics in cramped spaces

Power Supplies and Drives: Improves heat removal from power semiconductors including rectifiers and converters

Renewable Energy Systems: Acts as a thermal interface in solar inverters and wind turbine control boards

7. Integration with PCB Designs and Assembly Processes

Panasonic R-2400 can be seamlessly integrated within PCB stacking architectures as adhesive films or interlaminar thermal interfaces. Recommended design and processing notes include:

Controlled lamination pressure and temperature ensuring void-free adhesion

Use as bonding films between power substrates and heat spreaders

Compatibility with lead-free soldering process windows due to high Tg polymer matrix

Cleanroom fabrication and moisture-controlled storage to maintain material integrity

Proper partnership with fabricators is vital to optimize lamination cycles and guarantee uniform thermal performance.

8. Competitive Comparison with Alternative Thermal Films

Feature	Panasonic R-2400 Film	Competing Thermal Films	Silicone Thermal Pads
Thermal Conductivity	2.4 W/m·K	1.5 – 2.0 W/m·K	0.8 – 1.2 W/m·K
Tg and Heat Resistance	> 150 °C	Up to 130 °C	Usually < 150 °C
Dielectric Strength	> 15 kV/mm	10 – 15 kV/mm	7 – 10 kV/mm
Thickness Control	25 – 150 µm	50 – 200 µm	100 – 500 µm
Process Compatibility	Multilayer PCB lamination	Limited	Primarily final assembly

9. Best Practices for Design Engineers and Manufacturers

Assess thermal load requirements early and specify R-2400 thickness accordingly

Collaborate with PCB fabricators on lamination parameters for uniform thermal film integration

Validate dielectric properties after lamination and thermal cycling to ensure insulation reliability

Integrate R-2400 with proper copper thickness and heatsinking strategies for optimized overall thermal management

Maintain controlled storage conditions to avoid moisture ingress degrading bonding properties

10. Useful Resources and Technical Datasheets

Panasonic R-2400 Thermal Conductive Film Datasheet: Full technical details and application recommendations

IPC-4101 & IPC-2152: Industry standards for base materials and thermal design guidance

JEDEC JESD51: Thermal measurement standards critical for material qualification

Panasonic PCB Product Range & Support

11. Frequently Asked Questions (FAQs)

1. What is the thermal conductivity of Panasonic R-2400 thermal conductive film?

It is typically 2.4 W/m·K, significantly higher than standard FR4.

2. Can R-2400 be laminated into multilayer PCBs?

Yes, it is designed for seamless integration into multilayer PCB lamination processes.

3. Is the film electrically insulating?

Yes, exceeding 15 kV/mm dielectric strength ensures robust electrical isolation.

4. What operating temperature range does R-2400 support?

It operates reliably between -40°C and +150°C, suitable for harsh xEV/industrial environments.

5. What thicknesses are available for design?

Typically between 25 and 150 microns, customizable per application.

12. Conclusion

In xEV and industrial electronics, the Panasonic R-2400 thermal conductive film represents a key material enabling enhanced PCB-level thermal management. Its superior thermal conductivity, excellent electrical insulation, and compatibility with multilayer lamination processes empower engineers to design reliable, high-performance power and control boards meeting demanding operational conditions.

For comprehensive product information, technical support, and procurement, visit Panasonic’s dedicated PCB page at Panasonic PCB.

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Complete guide to Panasonic R-1766 glass epoxy PCB laminate — specs, Tg, Dk/Df tables, prepreg R-1661 data, applications, and fabrication tips for PCB engineers.

If you’ve spent any time sourcing laminate materials for multi-layer PCB production, you’ve almost certainly come across the Panasonic R-1766 glass epoxy PCB laminate. It sits in a sweet spot that a lot of engineers are looking for — solid thermal performance, reliable electrical behavior, and broad compatibility with standard FR-4 fabrication processes — without the cost premium of high-frequency specialty materials like the Megtron series. This guide walks through everything you need to know about R-1766, from raw property data to stackup considerations, with the kind of practical context that actually helps during material selection.

What Is the Panasonic R-1766? An Overview

The R-1766 (designated R-1766(GH) as a laminate) is a general-purpose glass epoxy multi-layer circuit board material manufactured by Panasonic Industry Co., Ltd. through its Electronic Materials Business Division. It is paired with the R-1661(GZ) prepreg for multi-layer construction, and together they form a matched system designed for standard to mid-level demanding PCB applications.

In practical terms, it’s a mid-Tg FR-4-class laminate. It is not a low-loss or ultra-low-Dk specialty material — that’s what the Panasonic PCB Megtron family is for. The R-1766 is the material you reach for when you need consistent, reliable FR-4-level performance with the confidence of a tier-one supplier behind it.

R-1766 in the Panasonic Portfolio

Panasonic’s electronic materials lineup spans from general-purpose FR-4 equivalents up to ultra-low-loss MEGTRON 8 (Tg 220°C, Dk 3.1, Df 0.0012). The R-1766 sits near the general-purpose end of that spectrum — it’s the everyday workhorse, not the exotic high-performance material. Understanding that positioning helps frame every specification comparison below.

Full Technical Specifications of Panasonic R-1766(GH) Laminate

The table below compiles the official typical values from the Panasonic datasheet (July 2022, No. 22070146). Note that these are typical values, not guaranteed values — always verify with the full datasheet before locking your design.

Thermal Properties

Property	Units	Test Method	Condition	Typical Value
Glass Transition Temp (Tg) — DSC	°C	DSC	As received	140
Glass Transition Temp (Tg) — TMA	°C	TMA	As received	140
Glass Transition Temp (Tg) — DMA	°C	DMA	As received	150
Thermal Decomposition Temp (Td)	°C	TGA	As received	315
T288 (without Cu)	min	IPC TM-650 2.4.24.1	As received	5
T288 (with Cu)	min	IPC TM-650 2.4.24.1	As received	1
CTE α1 — X-axis	ppm/°C	IPC TM-650 2.4.24	< Tg	11–13
CTE α1 — Y-axis	ppm/°C	IPC TM-650 2.4.24	< Tg	13–15
CTE α1 — Z-axis	ppm/°C	IPC TM-650 2.4.24	< Tg	65
CTE α2 — Z-axis	ppm/°C	IPC TM-650 2.4.24	> Tg	270

The Tg of 140°C (DSC/TMA) is the number to pay attention to most here. If your assembly process involves lead-free reflow — typically peaking at 260°C — you need to think carefully about how many thermal cycles your board will see and whether the T288 of 5 minutes (no copper) gives you enough headroom. For most standard consumer and industrial applications that go through one or two reflow passes, it’s workable. If you’re dealing with multiple lamination cycles or aggressive rework environments, you’re better served by a higher-Tg material.

Electrical Properties

Property	Units	Test Method	Condition	Typical Value
Volume Resistivity	MΩ·cm	IPC TM-650 2.5.17.1	C-96/35/90	1 × 10⁹
Surface Resistivity	MΩ	IPC TM-650 2.5.17.1	C-96/35/90	1 × 10⁸
Dielectric Constant (Dk) @ 1 MHz	—	IPC TM-650 2.5.5.9	C-24/23/50	4.6
Dielectric Constant (Dk) @ 1 GHz	—	IPC TM-650 2.5.5.9	C-24/23/50	4.3
Dissipation Factor (Df) @ 1 MHz	—	IPC TM-650 2.5.5.9	C-24/23/50	0.014
Dissipation Factor (Df) @ 1 GHz	—	IPC TM-650 2.5.5.9	C-24/23/50	0.016

A Df of 0.014–0.016 puts the R-1766 squarely in standard FR-4 territory. For reference, general-purpose FR-4 from common suppliers typically lands around 0.015 Df. This is not a material for differential pairs running at multi-gigabit speeds or RF traces above a few hundred MHz — signal loss will become a limiting factor. For standard digital designs at moderate speeds, these numbers are perfectly adequate.

Physical Properties

Property	Units	Test Method	Condition	Typical Value
Water Absorption	%	IPC TM-650 2.6.2.1	D-24/23	0.14
Peel Strength (1 oz)	kN/m	IPC TM-650 2.4.8	As received	2.0
Flammability	—	UL C-48/23/50	—	94V-0

Water absorption of 0.14% is quite low and contributes to dimensional stability and resistance to delamination during moisture-sensitive assembly steps. The UL 94V-0 flammability rating is a standard requirement for most product categories and confirms R-1766 passes without question.

Laminate Thickness vs. Dk/Df (R-1766(GH) — 1 MHz to 1 GHz)

This is the kind of data PCB designers actually need when building a stack-up. The Dk value shifts depending on the prepreg style and thickness:

Nominal Thickness (mil)	Cloth Style	Resin Content (%)	Dk @ 1 MHz	Dk @ 1 GHz	Df @ 1 MHz	Df @ 1 GHz
2.5	1080	57	4.2	3.9	0.016	0.018
4	2116	43	4.6	4.3	0.014	0.016
6	1501	42	4.6	4.3	0.014	0.016
8	7628	43	4.6	4.3	0.014	0.016
12	1501	42	4.6	4.3	0.014	0.016
16	7628	43	4.6	4.3	0.014	0.016
20	7628/2116	43	4.6	4.3	0.014	0.016
24	7628	43	4.6	4.3	0.014	0.016

Notice that the thin 1080-style prepreg at 2.5 mil comes in with a lower Dk (4.2 at 1 MHz) due to the higher resin content (57%). This matters for controlled-impedance trace calculations — if you’re mixing prepreg styles in a stack-up, don’t assume a flat Dk across every dielectric layer.

Panasonic R-1661(GZ) Prepreg — Companion Material

The R-1766 laminate is paired with the R-1661(GZ) prepreg for multi-layer builds. The prepreg data covers a broader range of cloth styles including 1080, 2116, 1501, 1504, and 7628. Resin content ranges from 42% to 70% depending on the cloth, with corresponding Dk values (at 1 GHz) ranging from 3.5 to 4.3.

When designing multi-layer stack-ups using R-1766/R-1661, keep these matched-set properties in your simulation models — using generic FR-4 Dk values for the prepreg layers will give you inaccurate impedance predictions.

Where R-1766 Fits: Target Applications

The Panasonic R-1766 glass epoxy PCB material is explicitly classified as a general-purpose multi-layer material. That label covers a wider range of boards than you might think:

Consumer Electronics — Home appliances, audio/video equipment, white goods. The combination of UL 94V-0 flammability, solid insulation properties, and cost-effective FR-4-class processing makes R-1766 suitable for high-volume consumer product PCBs where cost per square meter matters.

Industrial Control Boards — PLCs, motor drivers, power supply controllers, and similar industrial products operating in moderate temperature environments (well below 140°C ambient). The low CTE in X/Y axes (11–15 ppm/°C) helps with dimensional stability during thermal cycling.

ICT Infrastructure — Network switches, routers, and server backplanes running standard digital signaling. If your design doesn’t push past 1–2 Gbps per channel, R-1766 can serve you well. Above that range, consider upgrading to the Megtron 4 or Megtron 6 family.

Automotive Support Electronics — Not for under-hood or direct powertrain applications (Tg of 140°C is too low), but suitable for body electronics, cabin control modules, and infotainment boards where the thermal environment is manageable.

LED and Display Boards — Light control PCBs and driver boards for mid-range LED systems.

How R-1766 Compares to Other Materials

R-1766 vs. Standard Generic FR-4

Parameter	Panasonic R-1766	Generic FR-4 (typical)
Tg (DSC)	140°C	130–140°C
Td	315°C	~300°C
Dk @ 1 GHz	4.3	4.3–4.8
Df @ 1 GHz	0.016	0.015–0.022
Water Absorption	0.14%	0.10–0.20%
Source Quality	Panasonic tier-1	Varies widely
Datasheet Depth	Extensive (multi-GHz data)	Often minimal

The headline spec values are similar, but the consistency and supply chain reliability of a Panasonic material over generic FR-4 is a real-world differentiator for production engineers. Panasonic also publishes frequency-resolved Dk/Df data up to 10 GHz — something generic FR-4 suppliers rarely provide.

R-1766 vs. Panasonic R-1755V (Higher-Tg FR-4)

Parameter	R-1766(GH)	R-1755V
Tg (DSC)	140°C	173°C
Td	315°C	350°C
Dk @ 1 GHz	4.3	4.4
Df @ 1 GHz	0.016	0.016
Target Use	General-purpose	High-reliability, lead-free heavy

If your assembly involves aggressive lead-free processing, multiple reflow passes, or a higher operating temperature ceiling, R-1755V is the next step up within Panasonic’s FR-4-class lineup.

R-1766 vs. Panasonic Megtron 4 (Low-Loss)

Parameter	R-1766(GH)	Megtron 4
Tg	140°C	176°C
Dk @ 1 GHz	4.3	3.8
Df @ 1 GHz	0.016	0.005
Td	315°C	360°C
Cost	Lower	Higher
Target Use	General-purpose	High-speed digital

The Df difference (0.016 vs. 0.005) is where these two materials diverge sharply. At 10 Gbps and above, Megtron 4 is the correct choice. R-1766 is not a low-loss material.

Fabrication and Processing Considerations

Lead-Free Compatibility

The R-1766 is compatible with lead-free soldering processes, though its Tg of 140°C means the headroom above the peak reflow temperature (~260°C) is limited. The material’s Td of 315°C and T288 of 5 minutes (without copper) give some buffer, but you should count your reflow passes carefully. Two full lead-free reflow cycles are generally considered the practical limit for Tg-140 materials.

Drilling and Routing

Being an FR-4-class glass-epoxy material, the R-1766 drills and routes with standard carbide tooling and conventional spindle speeds. No exotic process modifications are required — it integrates into a standard FR-4 production flow.

Sequential Lamination

While the R-1766 supports standard multi-layer lamination processes, engineers considering sequential lamination (for via-in-pad designs or blind/buried via stacks) should carefully evaluate the cumulative thermal exposure. Each lamination cycle adds thermal stress on the dielectric, and the limited T288 of the R-1766 means you typically shouldn’t exceed two lamination cycles without detailed verification.

Panasonic’s Process Guidelines

Panasonic publishes a dedicated Process Guidelines document (covering R-1766/R-1661 among others) that outlines recommended lamination parameters including temperature ramp rates, press cycle durations, and cooling protocols. Consulting that document before finalizing your fabrication spec is strongly recommended.

Useful Resources for R-1766 Engineers

Resource	Description	Link
Official Panasonic R-1766 Datasheet (2022)	Latest IPC-format datasheet with full electrical and thermal data	Download PDF
Panasonic Electronic Materials Product Page	Product listing and download center	industrial.panasonic.com
IPC TM-650 Test Methods	Reference standard for thermal and electrical property testing	ipc.org
PCB Directory — R-1766 Listing	Third-party specs and supplier contacts	pcbdirectory.com
Panasonic Circuit Board Materials Overview	Full portfolio context	industrial.panasonic.com/cbm

Frequently Asked Questions About Panasonic R-1766

Is Panasonic R-1766 a true FR-4 material?

Yes, the R-1766 is a glass-fiber-reinforced epoxy laminate classified as an FR-4-grade material. It achieves UL 94V-0 flammability rating and meets the general electrical and mechanical requirements associated with the FR-4 designation. It is not a specialty low-loss or high-frequency material — it is Panasonic’s general-purpose offering in the glass epoxy multi-layer category.

What is the Tg of the R-1766 and why does it matter?

The R-1766 has a Tg of 140°C as measured by DSC and TMA, and 150°C by DMA. The glass transition temperature defines the point at which the laminate transitions from a rigid, glassy state to a softer, rubbery state — above Tg, the Z-axis CTE increases dramatically (from 65 ppm/°C to 270 ppm/°C), which puts stress on plated-through holes and vias. For lead-free assembly with peak temperatures around 260°C, the 140°C Tg is workable for a limited number of reflow passes but is not the highest-Tg option available in the Panasonic range.

Can R-1766 be used for controlled impedance designs?

Yes, with care. The Dk values from the datasheet (4.3–4.6 depending on prepreg style and frequency) are consistent enough for controlled impedance work, provided your simulation tool and fabricator are using the correct thickness- and frequency-specific Dk inputs. Avoid using a single flat Dk value across all layers if you’re mixing prepreg cloth styles.

What prepreg is used with R-1766 in multi-layer construction?

The standard companion prepreg is the R-1661(GZ). Panasonic publishes matched Dk/Df data for both the laminate and prepreg as part of the same datasheet package, which simplifies stack-up modeling. The two materials are processed under the same lamination guidelines.

How does R-1766 compare to other Panasonic materials for cost and performance?

R-1766 is positioned as a cost-effective general-purpose laminate. It is less expensive than higher-Tg Panasonic materials (like R-1755V) and significantly less expensive than the Megtron family. If your application needs Df below 0.010 or Tg above 150°C, you’ll need to step up to a more specialized Panasonic material — but for mainstream multilayer PCB production, R-1766 delivers reliable performance at competitive cost.

Final Engineer’s Perspective

The R-1766 is not a glamorous material — it doesn’t have the headline specs of Megtron 6 or MEGTRON 8. But that’s not what it’s trying to be. For the tens of thousands of multilayer boards that go through standard production lines every week — consumer products, industrial controls, mid-range networking gear — you want a material that processes cleanly, measures consistently, and is backed by detailed, credible datasheets. The Panasonic R-1766 glass epoxy PCB material checks all of those boxes. Know its Tg limits, don’t push it into high-speed signal applications it wasn’t designed for, and it will serve your design reliably.