G10 Epoxy Laminate Sheet – FAQ

What is G10 Epoxy Laminate Sheet? G10 epoxy laminate sheet is a high-performance electrical insulating material made...

What is G10 Epoxy Laminate Sheet?

G10 epoxy laminate sheet is a high-performance electrical insulating material made from glass fiber cloth impregnated with epoxy resin, then laminated under high temperature and pressure.

Key Features:

High mechanical strength, impact-resistant
Stable dimensions, suitable for precision components
Excellent electrical insulation
Low water absorption

1.Differences Between G10, FR4, and G11

Material	Flame Retardant	Temperature Rating	Cost	Typical Application
G10	No	130℃	Low	General electrical insulation, mechanical supports
FR4	UL94 V-0	130℃	Medium	PCB substrates, electronic components
G11	No	180℃	High	High-temperature electrical insulation, heavy-duty mechanical parts

Summary: G10 is for general industrial insulation; FR4 is for flame-retardant electronics; G11 is for high-temperature or high-load applications.

2.Main Applications of G10 Epoxy sheet

Transformer and reactor insulation supports: coil frames, insulating pillars, end plates
Electric motors and generators: insulating pads, winding supports, end-cap liners
Switchgear and distribution cabinets: support panels, partition boards, spacers
PCB and electronic components: non-flame-retardant substrates, connectors
Renewable energy: wind turbines, railway, HVDC battery insulation
Note: For long-term oil-immersed or high-temperature transformer coils, G11, laminated wood, or DDP insulation paper is recommended. G10 is suitable for dry-type or non-oil applications.

3.G10 Sheet Thickness and Sizes

Thickness: 0.2mm – 100mm, customizable
Standard Size: 1020×1220mm, 1220×2440mm
Custom Processing: CNC machining, drilling, milling, cutting
Surface Finish: Matte, polished, laminated

4.Performance of G10 Epoxy sheet

Mechanical: High tensile and impact strength, ideal for support structures, spacers, and insulating pillars
Electrical: High dielectric strength (>15 kV/mm), high insulation resistance
Thermal: Continuous use up to 130℃, short-term up to 160–180℃
Moisture Resistance: Low water absorption ≤0.2%, suitable for humid environments
Chemical Resistance: Resistant to most oils, solvents, mild acids and alkalis; not suitable for strong acids or alkalis
Machinability: Supports drilling, milling, cutting, and CNC processing

5.Selection Guide for G10

Electrical insulation: Dielectric strength >15 kV/mm
Operating temperature: ≤130℃ → G10; >130℃ → G11
Mechanical load: Thickness ≥5mm for structural components
Humidity: High-humidity environments acceptable
Chemical exposure: Avoid long-term contact with strong acids or bases

6.Processing and Machining Tips

Use carbide or diamond tools
Control cutting speed to avoid delamination
Ensure dust protection during machining
Edge chamfering or smoothing improves safety and durability

7.International Standards Compliance

NEMA G10 – US standard for insulating laminates
IEC 60893 – International laminated insulation board standard
ASTM D709 – Glass-epoxy composite material standard
UL 746 – Material certification for plastics and laminates
These standards ensure reliability in electrical, mechanical, and environmental performance.

8.G10 vs G11 vs FR4 Comparison

Feature	G10	FR4	G11
Temperature	130℃	130℃	180℃
Flame Retardant	No	UL94 V-0	No
Cost	Low	Medium	High
Machinability	Easy	Easy	Harder
Recommended Use	Dry transformers, general supports	PCBs, electronics	High-temperature transformers, high-power mechanical

9.Common Questions

Can it be used in oil-immersed transformers? Not recommended; G11 or laminated wood preferred.
Is it chemically resistant? Resistant to mild acids, alkalis, and oils; avoid strong acids/bases.
High water absorption? Very low, suitable for humid environments.
Is it machinable? Yes, supports drilling, cutting, milling, and CNC machining.

10.Consult the manufacturer

If you are looking for fr4 sheets, please contact XUJUE ElECTRICAL. Which is a professional manufacturer of high-quality electrical insulation materials with more than 65 years of manufacturing experience.it can be customized according to the product specifications, thickness and purpose you need.

Contact us now to get detailed product information and quotation. We can also mail samples for free for your testing.