... .5mm ~70mm 4.Manufactory type:CIP or Rolling Alumina ball have characteristics of high strength, high density, high abrasion ... , entire specification,strong practicability. It can be used for ball mill, mixing mill, vibration mill, sand mill, etc. ... ≤0.25≤0.2Mohs Hardness9999Water Absorption Rate(%)≤0.02≤0.02≤0.02≤0.02Bulk Density(g/cm3)≥3.0≥3 ... 15≤0.10 Contact Person: Ms Easter Alumina Ball--SGS