Automated comparison · 0% overlap

FR-4 (Glass Epoxy Laminate) vs PA66 (Nylon 66): 0% composition overlap. Significantly different materials serving different application areas.

FR-4 (Glass Epoxy Laminate) vs PA66 (Nylon 66)

Side-by-side chemical composition and mechanical property comparison.

Overview

FR-4 (Glass Epoxy Laminate)

PolymersReinforced

Flame retardant woven fiberglass cloth with epoxy resin binder — the worldwide standard substrate material for printed circuit boards (PCBs). Designated NEMA grade FR-4 and IPC-4101. Good mechanical strength, dimensional stability and electrical insulation up to 130°C (Tg). Dielectric constant 4.2–4.7 at 1 MHz. Self-extinguishing (UL94 V-0). Used for single/multilayer PCBs, electrical insulation boards, structural composites in electronics, test fixtures and jigs. Available in thicknesses 0.1–50 mm.

PA66 (Nylon 66)

PolymersPolyamide

Polyamide 66 — stiffer and more heat-resistant than PA6. Higher crystallinity gives better creep resistance and ~40°C higher melting point (260°C vs 220°C). Slightly more brittle. More moisture-sensitive at saturation than PA6. Trade names include Ultramid A (BASF), Zytel 101 (DuPont), Tecamid 66 (Ensinger). Dominant in US/UK markets. Used for automotive engine components, electrical connectors, gears, cable ties, and industrial bushings.

	FR-4 (Glass Epoxy Laminate)	PA66 (Nylon 66)
Material Number	—	—
Category	Polymers	Polymers
Standard	IPC-4101	ISO 10350

Mechanical properties

Property	FR-4 (Glass Epoxy Laminate)	PA66 (Nylon 66)	Unit
Flexural Strength	380–480	—	MPa
Tensile Strength	280–340	80–90	MPa
Compressive Strength	350–420	—	MPa

Density	1.8–1.9	1.13–1.15	g/cm³
Glass Transition Temp (Tg)	130–140	—	°C
Dielectric Constant (1MHz)	4.2–4.7	—	-
Dielectric Strength	40–50	—	kV/mm
UL94 Flammability	0	—	V-0
Water Absorption (24h)	0.1–0.2	1–1.5	%
tensile_strength	—	80–90	MPa
yield_strength	—	80–85	MPa
elongation	—	15–40	%
e_modulus	—	3–3.2	GPa
density	—	1.14–1.15	g/cm3
melting_point	—	260–265	°C
glass_transition_temp	—	70–80	°C
water_absorption_24h	—	1–1.3	%
Tensile Modulus	—	3000–3500	MPa
Elongation at Break	—	15–80	%
Charpy Impact (notched)	—	4–6	kJ/m²
Melting Point	—	255–260	°C
Glass Transition Temp	—	55–65	°C
Water Absorption (saturation)	—	7–8.5	%

Compatibility Assessment

FR-4 (Glass Epoxy Laminate) and PA66 (Nylon 66) have significantly different compositions (0% overlap). These materials are not interchangeable and serve different application areas.

Automated assessment based on composition analysis

Frequently Asked Questions

Is FR-4 (Glass Epoxy Laminate) the same as PA66 (Nylon 66)?

FR-4 (Glass Epoxy Laminate) and PA66 (Nylon 66) have a 0% composition overlap. They are generally not directly interchangeable.

Can I replace FR-4 (Glass Epoxy Laminate) with PA66 (Nylon 66)?

Generally not recommended. The compositions differ significantly (0% overlap). These materials have different alloying concepts and are intended for different applications.

What is the difference between FR-4 (Glass Epoxy Laminate) and PA66 (Nylon 66)?

The main differences are in the following elements: overall alloying content. FR-4 (Glass Epoxy Laminate) is a Polymers grade, while PA66 (Nylon 66) is a Polymers grade.

Related Comparisons

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View full data for each material:

FR-4 (Glass Epoxy Laminate) details PA66 (Nylon 66) details

Data provided for reference only. Always verify against the applicable specification for critical applications.

All data is for reference only. Equivalents indicate similarity, not identity. Always verify against the applicable specification for safety-critical applications. materialref.com accepts no liability for decisions based on this data.