Our fiberglass reinforced plastic (FRP) building material is strong, lightweight and nonconductive. Plus, pultruded structural fiberglass won’t corrode, rot, rust or warp so it’s ideal for harsh environments.Our fiberglass reinforced plastic (FRP) building material is strong, lightweight and nonconductive. Plus, pultruded structural fiberglass won’t corrode, rot, rust or warp so it’s ideal for harsh environments.