Detailed Product Description Alumina ( Al2O3 ) purity:99%, 99.5%, 99.7% Al2O3Endure high temperature of 1600 degrees CelsiusVarious shapes: ball, plungers, rings, plates, bars, discs and pistonsColors: white, black, pink and brownDensity: more than 3.85g/cm3 High strength: bending strength more than 300MPa High hardness: HV0.5 more than 1800 Low porosity: 0 could be metalized with MoMn, Ni, Pt,Ag ...