Use for the grinding or lab. for the ceramics industry. high-density and Low wear loss alumina grinding balls for continuous grind applications or batch mills, widely used in ceramics, glass, porcelain, enamel, pigment and mine Al2O3: 92% Density: 3.6g/cm EWT: less than 0.015% Compressive strength: above 2,000mPa Water absorption: less than 0.01% Crushing strength: greater than 520kN Hardness: 9 mohs Size: 15 to 100mm