G10/FR4 glass epoxy laminate
Thermoset composite
Glass-epoxy laminate for electrical insulation and mechanical rigidity.
G10/FR4 is a woven-glass-fabric epoxy laminate valued for electrical insulation, high mechanical strength, and dimensional stability. It's a composite, not a thermoplastic, and cuts and handles differently from every other material in this catalog.
Specs
- Density
- 0.065 lb/in³
- Stock thicknesses
- 0.0625, 0.125, 0.1875, 0.25, 0.375, 0.5, 0.75, 1 in
- Sheet size
- 48 x 36 in
- Brands available
- Any approved source
Price depends on size, quantity, tolerance and finish - get an exact number for this material in seconds.
Handling notice
- G10/FR4 glass epoxy laminate has a grain direction from its woven reinforcement; part orientation on the sheet can matter for strength in service.
Why this material
Choose G10/FR4 when you need genuine electrical insulation combined with mechanical rigidity - it isn't a substitute for any of the thermoplastics in this catalog, it solves a different problem.
Typical applications
- Electrical insulating boards and standoffs
- Fixtures and jigs requiring rigidity and dimensional stability
- PCB-adjacent structural components
- Cryogenic structural supports (low thermal conductivity)
Handling notes
- Cutting G10/FR4 produces fine glass dust that requires local exhaust and a P100 respirator - this material is batched to one scheduled shop day per week for that reason.
- The woven glass fabric has a grain direction; part orientation on the sheet can matter for strength in service. Flag this if your application is orientation-sensitive.
Questions
Why is G10 only cut on certain days?
Cutting G10/FR4 destroys carbide tooling faster than any other material we stock and produces glass dust requiring dedicated exhaust and PPE. Batching it to one scheduled day a week keeps that setup and blade cost from being spread across every order.
Is G10 the same as FR4?
They're the same glass-epoxy laminate family; FR4 specifically denotes a flame-retardant resin system, which is standard for this product today.
Does G10/FR4 warp after cutting like PEEK does?
No - it's a thermoset composite, not a thermoplastic, and doesn't carry the same residual-stress warping behavior. Its main handling consideration is the abrasive glass fiber, not stress relief.