yttria stabilized zirconia ceramic beads Item Unit Specification Composition wt% 94.5% ZrO2 5.2% Y2O3 Bulk Density Kg/L >3.6(Φ2mm) Specific Density g/cm3 â?¥6.02 Hardness Moh's >9.0 Elastic modulus GPa 200 Thermal Conductivity W/m.K 3 Crushing Load KN â?¥20 (Φ2mm) Fracture Toughness MPam1-2 9 Grain size µm â?¤0.5 Wear loss ppm/h