high density alumina grinding balls & lining blocks ¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨ Chemical composition ¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨ AL²0³>: 92.5% SiO²: 3% MGO: 1.7% BAO: 1.1% CaO: 0.7% Traces of other substances Physical specifications ¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨ Alumina content as high as 92.5% specific gravity: over 3.60 G/cm³   Average: 3.68 G/cm³ Porosity: 0 Hardness moh's: 9 Hardness rockwell 45N.: 75/79 Compressive strenght: 21/22.000 KP/cm² Bending strength: 3.200/3.400 KP/cm² Elasticity modulus: 2.7 / 2.8 x 106 KP/cm² Impact strength: 8 KP-CM/cm² Color: white Ball sizes available: 20 mm / 25 mm / 30 mm / 40 mm / 50 mm / 60 mm / 70 mm Block sizes available: 40 mm / 45 mm / 50 mm / 65 mm / 75 mm Also cylinders available