Plastic balls could be separated into POM balls, PA balls, PP balls, PE balls and so on according to their material. Plastic balls have a high hardness and rigidity and are high density and high crystalline linear polymer with a high degree of creep resistance, stress relaxation ability, excellent wear resistance, self-lubricating and fatigue. Plastic balls have good overall performance and fatigue resistance. And plastic balls are resistant to repeated impact and have a very small strength change. Plastic balls are mainly used in automobiles, sensors, valves, pumps, sanitary ware, electronics, bearings, electrical appliances, etc.