... furnace at a temperature of over 2200 celsius degree, and made into different grain sizes through crystal, choosing, ... densityg/cm33.90minParticle densityg/cm39.00minGrain sizesmm0-1 1-3 3-5 5-8 Physical characteristics Basic MineralAl2O3Crystal SysemHexagonalColourBrownTrue ... 1mm,1-3mm,3-5mm,5-8mm,200mesh,325mesh Applications:1.Coated and bonded abrasive tools2.Lapping and polishing processes3. ...