PBT resin is crystalline, linear saturated polyester, one of the excellent performance engineering plastics. In the five major engineering plastics, PBT industrialized latest but growing fastest. It mainly uses in automobile manufacturing, electronics, optical fiber communication, can also be used in the textile industry. PBT can be maintained good mechanical properties, heat resistance, chemical resistance and excellent electrical properties over a wide temperature range. In processing, PBT has good molding fluidity and high crystallization speed, And the process of molding is short, products’ surface is good gloss, dimensional is stable.