fiberglass molding part1.Material:P20,S55C,2738,718,2738,P20,45# 2. ... /Cold Runner We are specialized in designing and making fiberglass molding part Product Name fiberglass molding partCore & Cavity Steel S50C(45#),40Cr,P20H,718H ... ,2738,5CrNiMo,38CrMoAC,H13,S136HSteel hardness HRC 28--50Molding Way Compresion molding ...