... :3-70mm Application: concrete, building, ballmill. AL2O3: 95%, 92%, 75%, 68% industrial construction alumina ball : The Products, featured by high hardness, high density ... , inorganic mineral powders industries, etc. Technical date Sheet of abrasive alumina ball: Performance Index95 SeriesAl2o3(%)≥95Fe2O3(%)≤0.01Moh’s hardness9Moisture content(%)≤0 ...