... be made into grinding tools, brown aluminum oxide is characterized by sharp grinding, low heat generation ratio, high grinding rate and few ... using course, and the sintering grinding tools that is characterized by deep blue color after firing, without resillage, without rust and ... -125lb/cu. Ft. Specific Gravity: 3.9 Grain Shape: Angular/sharp Hardness: 9 Mohs Solubility: N/A Technical Data Al2O3: 96 ...