PP ball is a plastic ball a, a small proportion of the PP ball, floating in the water, so it can be used as a floating ball and PP ball and environmental protection, so it can be used in food and drug industry and cosmetic industry, the production process of PP ball than POM ball complex, mainly PP ball hardness is low, so the difficulty of polishing. The reason is that because of certain elastic PP ball, polished stone and PP ball rotates, the uneven friction, resulting in surface grinding as the rough surface, so the PP ball polishing need special polishing materials and equipment.