... of AL2O3, it can be divided into the specification as follows: Common Ceramic Ball, Inert Alumina Ceramic Ball, Medium-Alumina Ceramic Ball, High-AluminaCeramic Ball and 99%-AluminaCeramic BallDia(Φ): 3 ... to the content of aluminum:60-70%, 65-75%, 92%, 95% Size: Φ25mm-Φ75mm4. Ceramic ball for BearingCharacteristics:Compared with steel, ceramic materials are noted ...