... High grinding efficiency 2.High density 3.wear-resistant Zirconium oxide balls , zirconium oxide ceramic balls,12mm balls Jiaozuo Lifeng Industrial Co., ... .Size: Diameter(mm)3,3.7,4.5,5,6.5,7,8.5,10,12,1520,25,30,35,50Typical Value ... Property :ItemsValuesUnitComposition94.8%ZrO2+5.2%Y2O3Wt%Density≥5.95g/cm3Fracture toughness8-10MpaModulus of elasticity200GpaThermal conductivity3(20 ...