G11 rod is the cylindrical round-bar form of NEMA G-11 glass-epoxy laminate — a high-temperature thermoset composite of woven glass fabric and elevated-performance epoxy resin, produced in rod form by winding and curing under heat and pressure. G-11 rod is specified when turned or bored insulating components must perform reliably at continuous temperatures exceeding the 280°F limit of G-10 and FR-4, while maintaining the excellent machinability and electrical insulation properties of the glass-epoxy family.
G11 rod exhibits tensile strength of 63,000 psi, flexural strength of 75,000 psi, and compressive strength of 37,000 psi. Rockwell M112 hardness and a shear strength of 22,000 psi confirm the material's structural rigidity under machining loads and in-service stresses. Water absorption over 24 hours is 0.20%, maintaining dimensional stability in humid environments. The maximum continuous operating temperature is 355°F (180°C) — 75°F higher than G-10 rod — with a 94HB flammability rating.
Standards & compliance. G11 rod conforms to NEMA LI-1 Grade G-11 and is tested per ASTM D709. Ready Plastics stocks G11 rod in standard diameters as cut-to-length pieces; contact us for current size availability.
Sister grades. G-10 glass-epoxy rod is the cost-effective standard-temperature option for applications up to 280°F. FR-4 glass-epoxy rod adds UL 94 V-0 flame retardancy within the same thermal envelope. For the most extreme thermal environments — continuous service above 355°F — G-7 glass-silicone rod is rated to 425°F (220°C).
