... , Alumina pebbles, used in ceramic tile, cement, chemical, mineral 95% :Advantages:The products are featured by high hardness, ... . They are using ceramics, cements, paints, refractory, inorganic mineral powders and other materials to form. And the detailed information ... Index for alumina grinding balls: ProductAl2O3(%)Density(g/cm3)Water absorption(%)Moh’s hardness(scale)Abrasion loss(%)92 series92≥3 ...