G-7 Glass Silicone High-Temperature Laminate — Sheet

G7 sheet is a flat thermoset laminate of woven fiberglass cloth and silicone resin, produced per NEMA LI-1. The silicone binder — rather than epoxy — provides its defining characteristic: continuous operating temperature up to 425°F (220°C). G7 sheet also carries a UL 94 V-0 flame rating and excellent arc resistance, making it the top choice for flat insulating components in extreme-temperature electrical and industrial equipment.

Ready Plastics stocks G7 glass-silicone sheet in standard thicknesses. Contact us for current inventory dimensions and custom-cut availability.

G7 sheet is machined using carbide tooling on routers, mills, and drill presses. Like other glass-reinforced laminates, the fiberglass content is abrasive, so carbide is required for acceptable tool life. Use positive rake angles, moderate feed rates, and thorough chip clearance to minimize edge fraying. Dust extraction is essential for operator safety.

G7 and G-11 are both high-temperature NEMA glass laminates, but they use different resin systems. G-7 uses silicone resin and handles continuous service to 425°F (220°C); G-11 uses epoxy resin and is rated to 355°F (180°C). G-7 also provides better arc resistance. G-11 offers higher flexural and compressive strength. Choose G-7 when temperature exceeds 355°F or arc resistance is a priority.

G7 sheet is used for high-temperature electrical insulation barriers, arc-resistant switch panels, transformer barriers, furnace components, aerospace thermal shields, and any flat insulating component operating continuously above 355°F. Its UL 94 V-0 rating and 425°F thermal stability make it indispensable in demanding high-heat electrical environments.