G-10 Glass Epoxy Laminate — Sheet

G10 sheet is a flat thermoset composite of woven fiberglass cloth and epoxy resin, laminated under heat and pressure per NEMA LI-1. It offers a tensile strength of 40,000 psi, flexural strength of 75,000 psi, and only 0.11% water absorption over 24 hours. It is widely used for electrical insulation panels, structural jigs, substrates, and components requiring high stiffness and moisture resistance.

Ready Plastics stocks G10 glass-epoxy sheet in a range of standard thicknesses and sheet dimensions. Contact us for current inventory and to request custom-cut pieces.

G10 sheet is machined using carbide tooling on routers, mills, and drill presses. The woven fiberglass reinforcement is abrasive, so carbide or diamond-coated tooling outlasts HSS significantly. Use sharp tools, moderate feed rates, and positive chip clearance to minimize delamination. Dust and fiber extraction are important for operator safety.

G10 and FR-4 are both NEMA glass-epoxy laminates with similar mechanical and electrical properties. The key difference is flame retardancy: FR-4 carries a UL 94 V-0 rating, while G10 is rated 94HB. For UL-listed equipment, PCB fabrication, or any application requiring certified flame resistance, FR-4 is the correct choice. G10 is often used in non-flame-critical structural and insulation applications where it offers comparable performance at a comparable price.

G10 sheet is used for electrical insulation barriers, fixture and jig plates, wear pads, electronic chassis panels, transformer components, and structural supports in industrial and aerospace equipment. Its combination of high flexural strength (75,000 psi), low moisture absorption, and good dielectric properties makes it a versatile engineering material.