Elastic plastic ball with several materials, mainly TPU TPR plastic ball, plastic ball, plastic ball TPE, PVC plastic ball, which used a PVC plastic ball is mainly PVC plastic production difficulty, good toughness, the hardness of the ball can be controlled, the general production of elastic plastic ball hardness is at 90 degrees to 100 between the elastic, plastic ball in industrial use is mainly used in the switch valve, such as the above, as the plastic sealing ball to use, because the elastic plastic ball is elastic, so the valve in advance by the pressure, can seal the valve firmly, precision machining of elastic plastic ball is bigger than the difficulty of processing engineering plastic ball, the main reason is that in the process of grinding ball milling machine can not give pressure, because the pressure change will make the elastic plastic ball deformation, ground deformation in the state of the ball is not precision, tolerance, so elastic Plastic ball processing efficiency is very low, the price is also high.