G10 sheet is the flat-panel form of NEMA G-10 glass-epoxy laminate — a thermoset composite produced by impregnating woven fiberglass cloth with epoxy resin and laminating the assembly under heat and pressure into rigid, dimensionally stable flat stock. G-10 is the benchmark glass-epoxy grade: non-flame-retardant by default, but outstanding in mechanical strength, electrical insulation, and moisture resistance for a wide range of structural and electronic applications.
G10 sheet delivers tensile strength of 40,000 psi, an exceptional flexural strength of 75,000 psi, and compressive strength of 65,000 psi. Rockwell hardness reaches M110 and shear strength is 19,000 psi. Water absorption over 24 hours is just 0.11%, contributing to exceptional dimensional stability in humid environments. The material carries a 94HB flammability rating and a maximum continuous operating temperature of 280°F (140°C). These properties make G10 sheet a preferred choice for structural insulators, jigs and fixtures, electronic substrates, and panels requiring high stiffness.
Standards & compliance. G10 sheet conforms to NEMA LI-1 Grade G-10 and is tested per ASTM D709. It does not carry a UL 94 V-0 flame rating; for applications requiring flame retardancy, see FR-4. Ready Plastics stocks G10 sheet in a range of thicknesses and standard sheet dimensions; custom cuts are available.
Sister grades. For flame-retardant requirements, FR-4 glass-epoxy sheet adds UL 94 V-0 performance with comparable mechanical properties and is the go-to choice for PCB fabrication and UL-listed equipment. When higher operating temperatures are needed, G-11 glass-epoxy sheet withstands continuous service up to 355°F (180°C). For even greater thermal performance with arc resistance, see G-7 glass-silicone sheet.
