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polishing industry use Abrasives 65% Zirconia Ceramic Beads, Zirconium Silicate Beads Specific Gravity: 4.0 g/cm3 Bulk Gravity: 2.5 g/cm3 Hardness(Mohs) 8 ZrO2: 60-65% SiO2: 35% Elastic modulus: 200 ...