... , Φ5.0, Φ6.5, Φ7.0 Φ8.5, Φ10, Φ12, Φ15, Φ20, Φ25, Φ30, Φ40, Φ50, Φ60 RollingΦ8.0, Φ10 ... *7.5 Φ9.7*9.7 Φ12.7*12.7 Φ15*15 Φ20*20 *New molds are needed for making other non ... .2% Y2O3 HardnessKg/mm2>1200Densityg/cm³ ≥ 6.00 Crushing LoadKN ≥ 15(Φ5mm) Fracture ToughnessMpa.m0.58 High qulity grinding zirconia ball