微晶耐磨氧化鋁球性能指標 Performance Index of Microlite Abrasive Alumina Ball, Lining Brick, Lining Plate Pieces 產品Product 性能指標Performance Index 92系列/Series 80系列/Series 70系列/Series Al2O3(%) ≥92 ≥80 ≥70 Fe2O3(%) ≤0.25 ≤0.3 ≤0.35 莫氏硬度M0hs Hardness 9 8.5 8 吸水率（%）Water Absorption Rate ≤0.02 ≤0.02 ≤0.02 體積密度（g/cm3）Bulk Density ≥3.6 ≥3.3 ≥3.00 磨耗（‰） ≤0.15 ≤0.18 ≤0.20