Curb use of engineering plastic mold pp (polypropylene) raw materials determines the appearance and quality of the mold, so it has good malleability, machinability, hardenability, hardenability and can grind, but also has a small oxidation, decarburization sensitivity and deformation hardening cracking tendency of such materials will also be low vacuum mold surface hardening treatment, so the durability of the mold to a new level. Curb mold-produced raw materials are optional level manufacturing, quality and reliable