G10 Epoxy Glass Fiber Sheet Mechanical Strength and Applications

Time: 10-20 2025 Auther: Xujue Electrical

Mechanical Properties of G10 Epoxy Glass Fiber Laminate Product Introduction G10 epoxy glass fiber laminate is a co...

Mechanical Properties of G10 Epoxy Glass Fiber Laminate

Product Introduction

G10 epoxy glass fiber laminate is a composite material made of electrical-grade glass cloth impregnated with epoxy resin, cured under high temperature and high pressure.
This structure provides high mechanical strength, dimensional stability, low moisture absorption, and excellent electrical insulation.

G10 glass fiber laminates

Typical Mechanical Properties (at Room Temperature)

Property	Unit	Typical Value (G10)	Description
Density	g/cm³	1.80 – 1.90	Lightweight structural material
Tensile Strength	MPa	340 – 480	Maximum tensile load before failure
Flexural Strength	MPa	400 – 500	Resistance to bending deformation
Compressive Strength	MPa	350 – 450	Resistance to compression loading
Shear Strength	MPa	150 – 180	Interlaminar bonding strength
Impact Strength (Izod)	kJ/m²	10 – 15	Energy absorbed before fracture
Flexural Modulus	GPa	16 – 20	Stiffness under bending load
Poisson’s Ratio	—	0.12 – 0.17	Ratio of lateral strain to axial strain
Water Absorption (24h @23°C)	%	≤ 0.10	Indicates dimensional stability
Continuous Operating Temperature	°C	130 – 140	Recommended long-term service temperature
Heat Deflection Temperature	°C	150 – 180	Short-term heat resistance
Volume Resistivity	Ω·cm	≥ 1×10¹³	Electrical insulation through the bulk
Dielectric Strength	kV/mm	≥ 19	Breakdown voltage per thickness
Surface Resistivity	Ω	≥ 1×10¹²	Surface insulation capability
Flammability Rating	—	HB (G10) / V0 (FR4)	Fire resistance classification (UL94)
Strength Retention after Moisture	%	≥ 95	Strength stability under humidity exposure

Values may vary slightly depending on manufacturer and test standards (ASTM / IEC / GB/T).

Test Standards Reference

Test Item	International Standard (ASTM / IEC)	Chinese Standard (GB/T)
Tensile Strength	ASTM D638	GB/T 1447
Flexural Strength	ASTM D790	GB/T 9341
Compressive Strength	ASTM D695	GB/T 1041
Shear Strength	ASTM D2344	GB/T 1450
Water Absorption	ASTM D570	GB/T 1034
Dielectric Strength	ASTM D149 / D257	GB/T 1408

Stability and Performance Advantages

Thermal stability: Minimal strength loss between −40°C and 130°C.

Low moisture sensitivity: Strength decreases less than 5% after water absorption.

High interlaminar adhesion: Prevents delamination under load.

Excellent creep resistance: Suitable for long-term load-bearing structures.

Comparison with Other Materials

Material	Flexural Strength (MPa)	Density (g/cm³)	Remarks
G10	400–500	1.8–1.9	High strength, insulation, machinable
FR4	350–450	1.85	Flame-retardant version of G10
Aluminum 6061	≈300	2.7	Conductive, heavier
POM (Acetal)	≈80	1.42	Easy to machine, low strength
PEEK	150–200	1.3	Excellent but very costly

Conclusion:

G10 offers metal-like mechanical strength combined with electrical insulation and corrosion resistance, making it an ideal choice for mechanical structures, electrical insulation components, and automation systems.

G10 processing sheet

Machining & Handling Recommendations

Suitable for CNC milling, drilling, engraving, and laser cutting.

Use carbide or diamond-coated tools to prevent wear.

Control dust emissions (fiberglass dust is irritating to skin and lungs).

Store in dry, cool conditions, avoid prolonged exposure to sunlight or moisture.

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