... % Alumina grinding ball : The Products, featured by high hardness, high density, low wear loss. Good normalization, good corrosion-resistance, etc., are ... SeriesAl2o3(%)≥95Fe2O3(%)≤0.01Moh’s hardness9.5Moisture content(%)≤0.02Bulk Density(g/cm3)≥3.65Wearing loss≤0.06Ball size Normal size ...