... coating ,bauxite (2)High hardness, Low abrasive loss Ceramic beads,It can be used for superfine grinding of relatively soft nonmetal ... powder such as Superfine heavy CaCO3,kaolin , talc, etc.(1)Content of Alumina is ... High specific weight, true density is 2.7kg/l,bulk density is1.75kg/l(4)High performance /price ratio, very reasonable price Alumina grinding ...