Alumina grinding ball is grinding body used in ball mill, vibrating mill and other fine grinding plants, it has advantages of high hardness, high volumetric density and anticorrosion. With the smashing efficiency and scuff-resistance much better than that of common ball-stone of natural cobblestone , its is widely used in ceramics, glass, porcelain enamel. Pigment, chemicals and other trade. Composition Al2O3: 65%, 75%, 90% 92%, 95%, 99% Diameter : 1mm-90mm Mosh Hardness 9