... etc.Technical data: ItemsSS-AB-70Al2O3( % )66%--70%Specific Gravity g/cm32.95~3.02(Mohs Scale)Hardness8.5Compression Strength ... medium alumina grinding ball is widely used in the industry of ceramics, petroleum, fine chemical engineering, building materials, metallurgy, ... high cost performance in the present market because of its advantage of high hardness, high density, good high-temperature behavior ...