The glass beads,composed of Si,Na and Ca,are broken and calcined by high temperature after which the said microspheres are obtained.With properties of the high roundness rate,better hardness,excellent anti-friction and direct reflect light .They are widely applied in the fields of plastic rubber,abrasion ground,blast derusting,road-reflect dope and handicraft lamp,etc. Size:20-30# SiO2: 65%min Na2:14%max CaO: 8%max Packing: 25kg pp bag, 40 bags into 1 jumbo bag
