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The Impacts of Isola 370HR in PCB Fabrication

The Isola 370HR PCB material offers great properties and advantages. Isola 370HR PCB material guarantees successful PCB fabrication. This article seeks to provide important information about Isola 370HR.

What is Isola 370HR?

Isola 370HR is a high Tg PCB laminate. This laminate comprises the Fr-4 epoxy resin system. Also, it is specifically designed for multilayer PCB applications. Isola 370HR PCB material has advanced features such as CAF resistance and UV blocking. Also, this laminate features great dielectric and thermal properties.

This laminate comprises multifunctional epoxy resin with E-glass fabric reinforcement. Also, this resin system offers better thermal performance and low CTE while maintaining Fr-4 processability.

Furthermore, the mechanical and thermal performances of this laminate exceed that of traditional FR-4 materials. Also, Isola 370HR is compatible with Automated Optical Inspection (AOI) systems. This material is the best for sequential lamination designs.

Properties of Isola 370HR PCB Material

UV blocking

Isola 370HR offers high throughput during PCB manufacturing and assembly. Also, this laminate blocks the effect of UV rays on PCBs.

Very high glass transition temperature (Tg)

The Tg value of Isola 370HR is 180 degrees Celsius. Also, Isola 370HR features great thermal performance due to its high Tg value.

High Decomposition temperature (Td)

The decomposition temperature of Isola 370HR is 340 degrees Celsius at 5% weight loss. This helps to ensure high thermal performance. Also, this value indicates that the material can barely decompose chemically.

Exceptional thermal conductivity

The thermal conductivity of Isola 370HR is 0.4 W/m/K. This measures the rate of heat transfer in a PCB material. The thermal conductivity of Isola 370HR PCB material contributes to its performance.

CAF resistant

This is another great property of Isola 370HR. This PCB laminate is CAF resistant. Conductive anodic filament (CAF) causes failures in PCBs.  Isola 370HR PCB material is resistant to CAF and prevents failure in circuit boards. CAF occurs when a metallic filament is formed from an electrochemical migration process.

Glass fabric availability

This PCB laminate features standard E-glass. Also, the laminate features a square weave electronic glass reinforcement.

Low Z-axis CTE

The CTE value of Isola 370HR at z-axis is 45 ppm/ºC. With this property, Isola 370HR is a thermally stable material for PCB applications.

Copper Foils Used in Isola 370HR PCB Material

There are two different types of copper foil used in Isola 370HR PCB material. They include:

Reverse Treat Foil

This type of copper foil requires treating the electrodeposited copper’s face. The treatment used is a rough coating. Also, this treatment boosts the base foil adhesion to Isola 370HR dielectric. The reverse treat foil has a rough surface area ratio between the range of 1.0 and 1.2. However, this foil features dismal peel strength. Also, it is prone to delamination.

HTE Grade 3

HTE refers to High Elongation Electrodeposited copper. This type of copper foil is IPC-4562 Grade 3. The exterior face of the foil is semi-matt. Also, it features anti tarnish treatment. This reduces oxidation and corrosion during storage. In addition, the matt side gets Zn/Cr treatment. Therefore, this enhances adhesion to prepreg.

Thermal Analysis Techniques of Isola 370HR

There are several techniques for analyzing the thermal performance of Isola 370HR. These techniques include:

Thermal mechanical analysis

This analysis can measure the Tg of Isola 370HR. Thermal mechanical analysis determines the PCB material to measure Tg. Isola 370HR features around a 500% increase in post-Tg rate. Also, the actual expansion rates depend on the Isola laminate resin content.

Dynamic mechanical analysis

This analysis measures dissipation of energy and modulus properties of Isola 370HR. Also, these measurements offer quantitative and qualitative details of this material. This analysis is crucial in evaluating the mechanical properties of viscoelastic polymeric materials. These are PCB materials that show frequency and temperature effects.

Dynamic mechanical analysis helps to establish the Tg of resin systems. Also, this analysis is ideal for evaluating the cure extent and mechanical characteristics of Isola materials.

Differential scanning calorimetry

This thermal analysis technique establishes the Tg of Isola 370HR. Also, this analysis measures the flow of heat in and out of Isola 370HR. Changes in heat flow helps to detect the glass transition.

Thermal gravimetric analysis

This measures temperature degradation of Isola 370HR. Also, this technique determines the change in weight against temperature. PCB degradation often occurs over a wide temperature range. Also, it occurs when there is an irreversible chemical bond breakdown in the polymer structure. Isola 370HR features greater degradation temperature. Therefore, this material is more thermally stable.

Isola 370HR Sequential Lamination

Sequential lamination involves various technologies. It is a process that involves laminating a laminated subparts to an extra copper layer. Isola 370HR experiences at least two lamination cycles. Below are some technologies for sequential lamination of this PCB material.

High layer count HDI

This product features a thicker subpart which has about 6 to 26 layers. Also, it comprises about 2 sequential circuitry layers on each side. The center core of Isola 370HR use buried vias.

Blind via boards

You will have to join the subparts together. However, you will position the subparts on the external part of the finished PCB. Use drilled plated through hole to create connection for the subparts and he finished PCB.

Standard HDI

The Isola 370HR has a thin core at the center. Also, this core features about 2 to 4 layers. For each side, the core has 1 to 3 sequential applied circuitry layers. Microvias link the external layers. The standard HDI is the commonest approach in Isola 370HR sequential lamination.

Frequently Asked Questions

What is the best desmear method for Isola 370HR?

Plasma desmearing is the best desmear method for this PCB material. Also, this method etches the resin system and provides improved hole wall texturing. Also, you can perform this method without using a permanganate pass.

Does Isola 370HR adhere to RoHS standard?

Yes, Isola 370HR adheres to the RoHS standards. Therefore, this PCB material is safe for the environment.

What is the ideal weave style for Isola 370HR?

The square weave is ideal for Isola 370HR PCB material. This style has a uniform yarn count. Also, it features a similar pitch in all areas.


Isola 370HR PCB material is a reliable and high performance material for PCB fabrication. Also, this PCB material features great properties that enhance PCB functionality.




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