Designing a PCB that runs at 10 GHz, survives 200°C, or both? Standard FR-4 won’t cut it. Yet many engineers either default to FR-4 out of habit or switch to Rogers and ignore an entire category of high-performance laminates that could serve them better — or cheaper. Arlon is one of those underused options. It covers a broad family of specialty materials built for RF/microwave, power electronics, and aerospace applications. If you’re sourcing laminates for a demanding design and Arlon PCB hasn’t made your shortlist, this guide will show you exactly what you’re missing — and how to decide whether it’s the right call for your next build.

Arlon PCB laminates are specialty dielectric materials designed for high-frequency signal integrity, high-temperature stability, and harsh-environment reliability. They span ceramic-filled PTFE, polyimide, and thermoset composites — each optimized for specific Dk/Df, Tg, and loss characteristics that FR-4 cannot match.

What Is an Arlon PCB

Arlon Group LLC is a US-based specialty laminate manufacturer. Their product lines are not general-purpose — every series targets a defined engineering problem. You’ll find Arlon materials in military radar systems, satellite subsystems, phased-array antennas, high-power amplifiers, and downhole drilling electronics.

An Arlon PCB is any printed circuit board fabricated using an Arlon laminate as the dielectric substrate. The laminate determines the board’s electrical, thermal, and mechanical behavior — so choosing the right Arlon series is as important as the circuit design itself.

Arlon’s portfolio breaks into four main laminate families:

• PTFE-based (e.g., 25N, 25FR, CLTE series) — low loss, stable Dk, suited for RF and microwave
• Ceramic-filled PTFE (e.g., AD series) — controlled Dk from 2.5 to 10.2, minimal temperature drift
• Thermoset/Woven glass (e.g., 35N, 45N, 55NT) — high-Tg polyimide hybrids, IPC-4101C compliant
• High-Tg epoxy (e.g., 85N) — drop-in FR-4 replacement with Tg ≥ 170°C

Each family demands different processing parameters at the fab. If you’re sending an Arlon PTFE board to a standard FR-4 shop without confirming their process controls, you’re asking for trouble.

Arlon PCB Materials Compared: Key Series and Specs

Understanding which Arlon series fits your design starts with the electrical and thermal parameters that matter most: dielectric constant (Dk), dissipation factor (Df), glass transition temperature (Tg), and thermal decomposition temperature (Td).

Arlon Series	Base Material	Dk (at 10 GHz)	Df (at 10 GHz)	Tg (°C)	Primary Application
AD series	Ceramic-filled PTFE	2.50–10.20	0.0020–0.0040	N/A (PTFE)	RF/microwave, antenna
CLTE-XT	PTFE/woven glass	2.94	0.0012	N/A	Low-loss high-speed
25N	PTFE/woven	2.55	0.0015	N/A	Microwave, radar
35N	Polyimide/glass	3.70	0.0110	250	Multilayer, aerospace
45N	Polyimide/glass	3.70	0.0100	260	High-temp multilayer
55NT	Thermoset/PTFE	3.50	0.0040	230	Mixed RF + digital
85N	High-Tg epoxy	4.20	0.0180	175	Replacement for FR-4

Pro Tip: The AD series is your first look for controlled-impedance microwave designs. Dk values across the AD family (from 2.5 to 10.2) let you hit specific impedance targets without changing trace geometry — useful in constrained layouts.

High-Frequency Performance: How Arlon PTFE Laminates Work

At RF and microwave frequencies, two parameters dominate: dielectric constant (Dk) and dissipation factor (Df). Every millimeter of trace is a transmission line at these frequencies. Signal insertion loss breaks into two components — dielectric loss (proportional to Df) and conductor loss (proportional to surface roughness and copper weight).

Arlon PTFE-based laminates hold their Dk within ±0.05 from 1 MHz to 40 GHz. That stability is the reason you see them in phased-array antenna feed networks where inter-element phase matching requires consistent electrical length across hundreds of traces.

Compare Arlon 25N (Df = 0.0015 at 10 GHz) against standard FR-4 (Df ≈ 0.020 at 1 GHz, rising further at 10 GHz). That’s a 10x difference in dielectric loss. At a board-level signal path of 50 mm at 10 GHz, the insertion loss difference is measurable enough to degrade system noise figure.

Dk stability with temperature is equally important in thermal cycling environments. FR-4’s Dk shifts 10–15% over the −55°C to +125°C range common in mil-spec qualification. Arlon’s ceramic-filled PTFE materials (AD series) hold to within ±2% over the same range.

[IMAGE: Graph comparing Dk vs. frequency for Arlon PTFE vs. FR-4 — alt text: “Arlon PCB dielectric constant vs frequency stability chart”]

Controlled Impedance Design with Arlon Laminates

Microstrip and stripline impedance depend directly on Dk and dielectric thickness. With tighter Dk tolerance, your impedance prediction from field solvers (Sonnet, AWR, HFSS) matches fabricated results more closely. Arlon specifies Dk to ±0.10 or tighter across most lines. FR-4 manufacturers typically hold ±0.20 to ±0.50.

For 50Ω microstrip on a 0.5 mm thick CLTE-XT substrate (Dk = 2.94), trace width is approximately 1.2 mm. That same impedance on 0.5 mm FR-4 (Dk ≈ 4.5) requires a wider 0.9 mm trace. The narrower trace on Arlon is more area-efficient — a genuine layout advantage in dense microwave modules.

Engineer’s Note: When you calculate trace widths for Arlon PTFE boards, account for PTFE’s higher coefficient of thermal expansion (CTE) in the Z-axis — typically 175–250 ppm/°C vs. FR-4’s 50–70 ppm/°C. This matters for via barrel integrity in thermal-cycling assemblies. Specify copper-filled vias or use a via aspect ratio ≤ 8:1 per IPC-2221 recommendations.

High-Temperature Performance: Arlon Polyimide and High-Tg Series

Not every Arlon application is RF-driven. The polyimide series (35N, 45N) addresses a different failure mode: thermal delamination and via cracking in boards that see extended exposure above 150°C.

FR-4’s Tg is typically 130–140°C (some high-Tg grades reach 170°C). At temperatures near or above Tg, the resin softens and CTE in the Z-axis spikes. Vias crack. Pads lift. Multilayer adhesion fails.

Arlon 35N runs Tg at 250°C. Arlon 45N at 260°C. In a downhole drilling tool operating at 200°C ambient for hours, that 60°C margin is the difference between a passing temperature-cycle test and a field failure. Td (thermal decomposition temperature) for these materials exceeds 380°C, meaning lead-free solder reflow profiles (peak 260°C per J-STD-001) won’t begin attacking the resin.

[IMAGE: Cross-section of multilayer Arlon polyimide PCB stack — alt text: “Arlon polyimide PCB high-temperature multilayer cross-section”]

IPC Compliance and Material Classification

Arlon laminates map to specific IPC-4101C slash sheets:

• FR-4 equivalent (85N): IPC-4101C /26 (Tg ≥ 170°C)
• Polyimide (35N, 45N): IPC-4101C /40 and /41
• PTFE laminates: IPC-4101B /10 or /11 (unfilled PTFE)

When your design package specifies “IPC-4101C /41 compliant,” your fabricator must source a material that meets those electrical and thermal requirements. Arlon 45N qualifies. Specifying an IPC slash sheet gives you material performance traceability without locking you into a single brand — useful for dual-sourcing in mil/aero programs.

Pro Tip: Always request a Material Data Sheet (MDS) from your fab confirming the Arlon lot number and material series used. Lot traceability is a standard requirement under AS9100D for aerospace boards and under MIL-PRF-31032 for military programs. RAYPCB maintains full material traceability documentation on aerospace and defense builds.

Arlon PCB Design Rules: What Changes from FR-4

Working with Arlon materials is not the same as working with FR-4. Experienced Arlon PCB manufacturers adjust their processes accordingly. Here’s what you need to know at the design stage.

Minimum Feature Sizes and Layer Counts

Arlon PTFE materials are softer than FR-4. Drilling generates more smear. Z-axis CTE is higher. These properties impose tighter design rules:

1. Minimum via drill diameter: 0.2 mm mechanical, 0.1 mm laser (on thin cores)
2. Via aspect ratio: ≤ 8:1 preferred; ≤ 10:1 maximum for PTFE laminates per IPC-2221B
3. Annular ring: ≥ 0.125 mm for Class 2; ≥ 0.05 mm for Class 3 (IPC-6012E)
4. Minimum copper trace/space: 75 µm / 75 µm for standard; 50 µm / 50 µm for advanced fabrication
5. Layer counts: 2–20 layers typical; PTFE multilayers beyond 8 layers require bonding films
6. Controlled impedance tolerance: ±5% (Class B per IPC-2141A); tighten to ±2% for critical RF nets

For mixed-material stackups — Arlon PTFE signal layers bonded to FR-4 or Rogers core layers — you need explicit stackup drawings with material callouts on every layer. Do not leave material selection to the fab unless you have a confirmed spec sheet agreement in place.

Copper Foil Selection

Surface roughness on the copper foil directly affects insertion loss at frequencies above 5 GHz. Standard electrodeposited (ED) copper has an RMS roughness of 1.5–3.0 µm. At 10 GHz, skin depth in copper is about 0.66 µm — nearly all current flows in the skin layer, and surface roughness becomes a dominant loss factor.

For Arlon RF boards, specify reverse-treated foil (RTF) or very-low-profile (VLP) foil with RMS roughness ≤ 0.5 µm. The tradeoff is slightly lower peel strength (~0.8 N/mm vs. 1.2 N/mm for standard ED) — acceptable for rigid boards, something to flag on flex or rigidified designs.

Real-World Application: Arlon AD300D in a Ku-Band Phased Array Feed Network

Consider a 16-element phased-array antenna module operating at 12.5 GHz Ku-band, used in a satellite communication terminal. The RF feed network must distribute signal to each radiating element with amplitude variation < 0.5 dB and phase variation < 5° across the aperture.

The design team selected Arlon AD300D (Dk = 3.00 ± 0.05, Df = 0.0023 at 10 GHz) for the signal distribution layer. Substrate thickness was 0.508 mm (20 mil), supporting 50Ω microstrip at 1.24 mm trace width with a copper weight of 0.5 oz/ft² (17 µm).

Key fabrication choices:

• Copper foil: VLP RTF, 0.5 oz, RMS roughness < 0.4 µm
• Via construction: Filled and capped vias on the SMA launch pads, drill diameter 0.3 mm
• Soldermask: Liquid photo-imageable (LPI), pulled back 0.1 mm from RF traces to prevent dielectric loading
• Surface finish: Electroless nickel / immersion gold (ENIG) per IPC-4552, 3–5 µin Au over 120–240 µin Ni

The fabricated board measured insertion loss of 0.48 dB at 12.5 GHz over a 60 mm signal path — within 0.03 dB of the simulation result from HFSS. Phase variation across the 16-element feed network came in at ±2.8°, well inside the 5° budget. That result is repeatable because Dk variation on AD300D from panel to panel is controlled to ±0.05 — which is what you’re paying for.

[IMAGE: Ku-band phased array PCB with exposed RF trace network — alt text: “Arlon AD300D PCB Ku-band phased array feed network”]

Common Mistakes When Designing and Ordering Arlon PCBs

Even experienced engineers make avoidable errors when transitioning from FR-4 to Arlon laminates. Here are the ones that show up most often at the fabrication stage.

Mistake 1: Specifying Arlon series without confirming fab capability. Not every PCB manufacturer stocks Arlon laminates. Some will substitute a “similar” material without telling you. Always confirm the exact Arlon part number — not just the family or the Dk value — before sending your order.

Mistake 2: Ignoring bonding film compatibility. PTFE does not bond to itself or to FR-4 without a compatible adhesive film. Arlon provides bonding films (e.g., Arlon CuClad 6700) for PTFE-to-PTFE lamination. Using a generic FR-4 prepreg to bond PTFE layers causes delamination in thermal cycling. Get the stackup approved by your fab before releasing Gerbers.

Mistake 3: Running standard FR-4 drill parameters on PTFE. PTFE is viscoelastic. High drill spindle speeds smear the material into the via barrel. Fabs need to run lower speeds, higher feeds, and use new drill bits on PTFE laminates. A via on an under-processed PTFE board shows poor barrel quality on the IPC-A-600 microsection — and that’s a Class 3 rejection.

Mistake 4: Applying standard soldermask over RF traces. Soldermask adds a thin dielectric layer over your copper. On RF lines, this shifts the effective Dk and changes characteristic impedance. Either remove soldermask from RF traces (specify “LPI soldermask, RF trace clearance 0.1 mm”) or account for it in your field solver model.

Mistake 5: Skipping thermal stress testing on polyimide multilayers. IPC-TM-650 method 2.6.27 (IST — interconnect stress test) should be specified for Arlon polyimide builds going into high-reliability applications. It’s not required by default — you have to call it out in your acceptance criteria.

Mistake 6: Assuming standard lead times. Arlon specialty materials are not warehouse stock at most fabs. Lead time for raw laminate can be 2–4 weeks. Plan accordingly and communicate with your fabricator before your tape-out date.

[IMAGE: Close-up of via cross-section in Arlon PTFE board showing barrel quality — alt text: “Arlon PCB via barrel cross-section quality inspection”]

Arlon PCB Cost Factors

Arlon PCB cost is substantially higher than FR-4 — this is not negotiable, and understanding why helps you budget correctly and justify the spend to your program manager.

Raw Material Cost

Arlon PTFE laminates cost roughly 8–15x the raw material cost of standard FR-4 on a per-panel basis. Polyimide laminates (35N, 45N) run 3–6x. The high-Tg epoxy 85N is the most price-competitive — typically 1.5–2x FR-4.

Processing Cost Multipliers

Specialty fabrication adds labor and yield risk:

• PTFE drilling: slower feeds, higher drill cost, more frequent bit changes
• Controlled impedance testing: adds time-domain reflectometry (TDR) cost
• Ionic cleanliness testing (IPC-TM-650 2.3.25): typically required for aerospace builds
• Microsection analysis (IPC-A-600): destructive test, adds cost on sample coupons

Layer Count Impact

Arlon cost scales more steeply with layer count than FR-4, because each additional PTFE layer requires compatible bonding film and a confirmed lamination cycle. A 4-layer Arlon PTFE board costs significantly more than two 2-layer boards — unlike FR-4 where incremental costs are smoother.

Realistic Cost Range

Board Type	Layer Count	Approx. Cost per Panel (prototype)
Arlon 85N (high-Tg epoxy)	4L	$120–$250
Arlon 35N/45N polyimide	6L	$400–$900
Arlon AD/CLTE-XT (PTFE)	4L	$600–$1,500
Arlon AD/CLTE-XT (PTFE)	8L	$1,800–$4,000+

Prices vary by panel size, copper weight, via count, impedance requirements, and certifications. Request a full RFQ — rough estimates at the design stage will mislead your budget.

Pro Tip: If Arlon PCB cost is a constraint, evaluate whether a hybrid stackup meets your performance requirement. Placing Arlon PTFE only on the RF signal layers while using standard FR-4 or polyimide for power and digital layers can cut material cost by 30–50% on mixed-signal boards. Confirm bonding compatibility with your fabricator first.

How to Choose an Arlon PCB Manufacturer

Not every PCB shop can build Arlon boards to spec. Here is a checklist to qualify your fabricator before committing:

• Confirmed Arlon laminate stocking or ordering agreements (ask for proof of purchase or distributor relationship)
• PTFE-specific drill programs and tooling in place
• Controlled impedance testing with TDR equipment; can hold ±5% or tighter
• Compatible bonding film inventory for your target stackup
• IPC-6012E Class 2 or Class 3 certification (Class 3 for military/aerospace)
• AS9100D certification (for aerospace programs)
• MIL-PRF-31032 qualification (for US DoD programs)
• Material traceability documentation (lot numbers, MDS on file)
• Microsection cross-section capability for IPC-A-600 inspection
• Experience with at least 20 Arlon PTFE builds in the past 12 months (ask for references)

RAYPCB fabricates Arlon PCBs across the full portfolio — PTFE, polyimide, and high-Tg epoxy series — with full IPC-6012E Class 3 compliance, controlled impedance TDR testing on every production panel, and material traceability documentation for aerospace and defense programs.

[IMAGE: PCB fabrication line with controlled impedance test setup — alt text: “Arlon PCB manufacturer controlled impedance TDR testing”]

Arlon vs. Rogers vs. FR-4: Choosing the Right Laminate

The three most common laminate choices for high-performance designs are Arlon, Rogers (now part of DuPont), and FR-4. Here’s how they compare across the decision-relevant parameters.

Parameter	FR-4 (standard)	Rogers RO4350B	Arlon AD300D	Arlon 45N (Polyimide)
Dk at 10 GHz	~4.5 (varies)	3.48 ± 0.05	3.00 ± 0.05	3.70
Df at 10 GHz	~0.020	0.0037	0.0023	0.0100
Tg (°C)	130–140	N/A (thermoset)	N/A (PTFE)	260
CTE Z-axis (ppm/°C)	50–70	46	~175	57
Processability	Standard	Near-standard	PTFE-specific	Standard
Relative cost	1x	4–6x	8–12x	3–5x
Best use case	Digital, low-freq	RF up to 30 GHz	Microwave, low-loss	High-temp multilayer

Rogers RO4350B is the dominant choice for designs from 1–30 GHz where the fab needs near-FR-4 processability. Arlon AD300D competes directly with Rogers at microwave frequencies and often wins on insertion loss at frequencies above 20 GHz due to its lower Df. Arlon 45N polyimide has no direct Rogers equivalent at 260°C Tg — it occupies a different performance space.

Engineer’s Note: If your design brief says “use Rogers,” push back and ask for the performance requirement instead. “Rogers” has become a generic term like “Kleenex.” The actual requirement is Dk, Df, Tg, and processability — parameters Arlon meets or exceeds on most metrics. A competitive quote from an Arlon PCB manufacturer often comes in lower on the same electrical spec.

Frequently Asked Questions About Arlon PCBs

What frequencies are Arlon PCB laminates rated for? Arlon PTFE-based laminates (AD series, CLTE-XT, 25N) are characterized to 40 GHz and used in designs to 77 GHz in automotive radar applications. The polyimide series (35N, 45N) are not primarily RF materials but perform acceptably to 3–5 GHz in multilayer stackups where thermal performance is the design driver.

Can Arlon boards be processed through standard SMT reflow? Yes for polyimide and high-Tg epoxy series. Arlon 35N, 45N, and 85N withstand lead-free reflow peak temperatures of 260°C with no degradation — the Td exceeds 380°C. PTFE-based Arlon boards should be reviewed for specific reflow conditions; PTFE has higher Z-axis CTE, and repeated thermal cycling above 200°C can stress via barrels if aspect ratio and fill specification are not followed.

Is Arlon a suitable Rogers alternative? For many microwave designs, yes. Arlon AD300D and Rogers RO4003C occupy a similar electrical performance space (Dk ~3.0, Df ~0.002 at 10 GHz). Arlon tends to offer slightly lower Df at frequencies above 20 GHz. Processability is comparable. The choice often comes down to fabricator preference, regional laminate availability, and program-specific material qualification.

What is the minimum order quantity for Arlon PCB builds? Most specialty fab shops quote Arlon jobs at 5-panel minimums for prototype, with production runs starting at 20–50 panels. Some manufacturers accommodate single-panel prototype builds with NRE setup charges. Contact your fabricator early — raw laminate lead times can be 2–4 weeks.

How do I specify Arlon material on my board drawings? Reference the Arlon part number in the material callout on your fabrication drawing. Example: “Dielectric: Arlon AD300D, Dk = 3.00 ± 0.05, thickness 0.508 mm ± 10%.” Also call out the IPC-4101 slash sheet for traceability. Do not rely on “PTFE laminate” or “RF material” — these are too vague to enforce at the fab.

Do Arlon PCBs require special storage conditions? PTFE laminates are dimensionally stable and not moisture-sensitive in the same way FR-4 is. However, Arlon recommends storage at 15–30°C and ≤ 70% RH for all laminate families. Polyimide laminates should be baked at 120°C for 4–6 hours before layup if stored for more than 30 days, consistent with standard polyimide handling per IPC-1601.

Can Arlon laminates be combined with other materials in a hybrid stackup? Yes, but with conditions. PTFE-to-PTFE bonding requires Arlon-compatible bonding films, not standard epoxy prepregs. PTFE-to-FR-4 hybrids are feasible with specific adhesive systems and have CTE mismatch implications at the interface. Polyimide-to-FR-4 hybrids are more straightforward. Always validate the stackup with your fabricator before committing to a design.

What certifications should I require from an Arlon PCB manufacturer? At minimum: IPC-6012E Class 2 for commercial, Class 3 for military/aerospace. Add AS9100D for aviation programs, MIL-PRF-31032 for US DoD contracts, and ITAR registration if your design data is export-controlled. For space-grade applications, NASA-STD-8739.3 and J-STD-001 Class 3 requirements should be called out in your procurement specification.

Choosing the Right Arlon PCB Manufacturer for Your Program

Arlon materials deliver performance that standard FR-4 cannot — but only if the fabrication is executed correctly. The laminate alone doesn’t guarantee results. Drill parameters, lamination cycles, bonding films, surface finish selection, and impedance test methods all affect whether a board meets spec or gets scrapped.

Your design deserves a fabricator with a documented track record on the specific Arlon series you’re targeting. If you’re working on a radar front-end, a satellite payload, a downhole sensor, or any board where thermal stability or signal loss margins are tight, that’s exactly where RAYPCB’s specialty laminate team operates. We stock Arlon laminates across the AD, CLTE, polyimide, and high-Tg series and process them under IPC-6012E Class 3 controls.

Request a quote at RAYPCB.com. Include your Arlon series, layer count, controlled impedance requirements, and IPC class — we’ll send a detailed DFM review and firm pricing within 24 hours.