XX rod is the solid round-bar form of NEMA Grade XX paper-phenolic laminate — a thermoset composite produced by impregnating kraft paper with phenolic resin and curing under heat and pressure into a lightweight, machinable cylindrical stock. Grade XX is the workhorse mechanical-electrical grade of the paper-phenolic family, balancing low cost, easy machinability, and good performance under low-humidity conditions, making XX rod a practical choice for general-purpose insulating posts, terminal pins, and small machined parts.
XX rod delivers tensile strength of 14,000 psi, flexural strength of 16,000 psi, and compressive strength of 26,000 psi. Rockwell hardness reaches M105 and shear strength is approximately 11,000 psi. Water absorption over 24 hours is approximately 3.5% — higher than fabric-reinforced grades, so XX is best suited to dry environments. The material carries a UL 94HB flammability rating and operates continuously up to 250°F (121°C). Dielectric strength is approximately 500 V/mil short-time at 1/16″ thickness perpendicular to laminations. These properties make XX rod a low-cost choice for insulating posts, pulleys, low-load gears, and small machined hardware.
Standards & compliance. XX rod conforms to NEMA LI-1 Grade XX and meets defense specification MIL-I-24768/12 (Type PBE). Test methods follow ASTM D709. Ready Plastics stocks XX rod in standard diameters; request a custom cut or contact us for availability.
Sister grades. For improved electrical performance at slightly higher cost, Grade XXX paper-phenolic rod offers higher dielectric strength under humid conditions. For higher impact resistance, step up to Grade C cotton-phenolic rod or Grade CE cotton-phenolic rod. When mechanical strength and dimensional stability under moisture are critical, consider G-10 glass-epoxy rod.
