Pottery clay, porcelain clay, carclazyte and clay are collectively called kaolin which is the filler used mostly in the rubber and plastic industry. Kaolin filler is divided into natural hydrated kaolin and calcined kaolin. In the rubber industry, it is easy for glue stock containing kaolin to process products. The surface is more smooth and it can help delay vulcanization rate. Vulcanized rubber added kaolin takes advantages of high tensile strength and stretching strength and good ear resistance, which makes kaolin popular in the industry. So many teams have researched the superfine grinding technology and modification treatment of kaolin.