G10/FR4 is an electrical-grade, dielectric fiberglass laminate epoxy resin system combined with a glass fabric substrate.  G10/FR4 offers excellent chemical resistance, flame ratings and electrical properties under both dry and humid conditions.  It also features high flexural, impact, mechanical and bond strength at temperatures up to 266°F (130°C). G10/FR4 is suitable for structural, electronic, and electrical applications as well as pc boards.