... density alumimum oxide 2.competitive price for sapphire growing 3.types: powder, ball, pellet, crackle High purity ... purity of 99.996-99.999%, density of 3.0-3.6g/cm.Main applications:1.sapphire crystal, ... crystal rods; 2.sapphire plate, sapphire crystal block; 3. laser crystal (YAG) and man-made gemstone, etc ... 99.996-99.999%, density of 2.5-3.5g/cm.Main uses:1.Filling2.Heat insulation layerSapphire ...