G-7 Glass Silicone High-Temperature Laminate — Rod

G7 rod is a solid round bar made from NEMA G-7 glass-silicone laminate — woven fiberglass impregnated with silicone resin and cured under heat and pressure. Its silicone binder provides continuous service capability up to 425°F (220°C), a UL 94 V-0 flame rating, and excellent arc resistance. It is the highest-temperature round rod in the glass-reinforced thermoset laminate family.

Ready Plastics stocks G7 glass-silicone rod in standard diameters as cut-to-length pieces. Contact us for current size availability and pricing.

G7 rod is machined using carbide tooling. The woven fiberglass reinforcement is highly abrasive, so carbide inserts are required for acceptable tool life. Use moderate cutting speeds, positive rake geometry, and thorough chip clearance. Because the silicone resin can be somewhat gummy compared to epoxy grades, slightly lower cutting speeds are often beneficial. Dust and fiber extraction are important for operator safety.

G7 rod uses a silicone resin matrix; G11 rod uses an epoxy resin matrix. G-7 handles continuous service to 425°F (220°C) and offers superior arc resistance. G-11 is rated to 355°F (180°C) and provides higher compressive strength (37,000 psi vs. no published compressive value for G-7). Choose G-7 when service temperature exceeds 355°F or when arc resistance is required.

G7 rod is used for high-temperature insulating bushings, spacers, standoffs, and structural supports in transformer construction, high-voltage switchgear, furnace equipment, aerospace thermal assemblies, and industrial machinery operating above 355°F continuously. Its 425°F thermal rating, UL 94 V-0 flame rating, and excellent arc resistance make it the top choice in extreme-temperature glass-laminate rod applications.