We use special resin types in our pultrusion process, which make all the difference. They include high heat distortion isophtalic polyester, phenolic novolac vinyl ester, polyurethane, epoxy, and other polyester and vinyl ester resins, blends and alloys. Our pultrusion process and chemical formulations generate straight parts, no arc or camber. Pultrusion is a continuous process for manufacturing composite materials with constant cross-section. Reinforcing fibers are pulled through a resin, and into a heated die, where the resin undergoes polymerization.