features: 1) ceramic balls include common balls (al2o3 17-23%), inert ceramic balls (al2o3 23-30%), pure ceramic balls (al2o3 99%) 2) catalyst bed support media has been widely used in many fields, including petroleum, chemical engineering, fertilizer production, natural gas and environmental protection 3) used as covering and supporting material of catalyst in reaction vessel and as packing in tower 4) with stable chemical specialties and a low rate of water absorption, it can resist high temperature and high pressure