Plastic ball as part of electrical accessories, water supply and drainage valve accessories, auto parts and other industries, but the industry's different requirements for plastic balls are different, the proportion used in the field of food will choose PP plastic ball to use, mainly because PA plastic ball, mainly because PA toughness, oil and other characteristics, the market demand above still not easy to rust, weight and other shortcomings in the chemical field, plastic ball production process than steel complex, so the price of plastic ball than steel ball complex, so the price of plastic ball PP the steel ball is much higher, mainly is the production technology aspect, the processing efficiency Aspect is not as simple as the production of steel ball, the cost of production is higher than the steel ball.