In recent years, the use of plastic in the automobile industry in China is increasing rapidly. Plastic parts are no longer only put inside the car but also becoming external and structural component. For now, there are over 40 auto parts that can be made of plastic and the number is still growing. Plastic auto parts enjoys a variety of advantages, such as high rigidity and strength, heat and wear resistant, light and with extensive application. These advantages make the car lighter, save energy and reduce exhaust.