Automated comparison · 0% overlap

FR-4 (Glass Epoxy Laminate) vs PBT GF30: 0% composition overlap. Significantly different materials serving different application areas.

FR-4 (Glass Epoxy Laminate) vs PBT GF30

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.

PBT GF30

Polymerspolyester_reinforced

Polybutylene Terephthalate with 30% glass fiber — THE connector and electrical component material. Key advantage over PA6 GF30: near-zero moisture absorption (0.02-0.2%), so mechanical and electrical properties are stable regardless of humidity. Lower UTS than PA6 GF30 but consistent. Trade names include Ultradur B4300 G6 (BASF), Valox 420 (SABIC), Celanex (Celanese), Crastin (DuPont). Used for electrical connectors, relay housings, coil formers, automotive sensors, and any part requiring dimensional stability in humid environments.

	FR-4 (Glass Epoxy Laminate)	PBT GF30
Material Number	—	—
Category	Polymers	Polymers
Standard	IPC-4101	ISO 10350

Mechanical properties

Property	FR-4 (Glass Epoxy Laminate)	PBT GF30	Unit
Flexural Strength	380–480	—	MPa
Tensile Strength	280–340	130–150	MPa
Compressive Strength	350–420	—	MPa

Density	1.8–1.9	1.52–1.55	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	0.03–0.06	%
tensile_strength	—	145–165	MPa
elongation	—	2–3	%
e_modulus	—	9.5–11	GPa
density	—	1.52–1.54	g/cm3
hdt_1_8mpa	—	200–210	°C
melting_point	—	220–225	°C
water_absorption_24h	—	0.02–0.08	%
Tensile Modulus	—	10000–12000	MPa
Elongation at Break	—	2–4	%
Charpy Impact (notched)	—	8–12	kJ/m²
Melting Point	—	223–227	°C
HDT/A (1.8 MPa)	—	210–220	°C
Glass Fiber Content	—	30	%

Compatibility Assessment

FR-4 (Glass Epoxy Laminate) and PBT GF30 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 PBT GF30?

FR-4 (Glass Epoxy Laminate) and PBT GF30 have a 0% composition overlap. They are generally not directly interchangeable.

Can I replace FR-4 (Glass Epoxy Laminate) with PBT GF30?

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 PBT GF30?

The main differences are in the following elements: overall alloying content. FR-4 (Glass Epoxy Laminate) is a Polymers grade, while PBT GF30 is a Polymers grade.

Related Comparisons

PBT GF30vsPA6 GF30

View full data for each material:

FR-4 (Glass Epoxy Laminate) details PBT GF30 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.