... ratio up To grade % ≥98, ≥98, ≥96, ≥96Bulk Density1g/ml: ≥0.60 ≥0.60 ≥0.60 ≥0.60Wear Ratio%: &le ... ;0.20, ≤0.25, ≤0.20, ≤0.20Crushing strength N: ≥30/cm, ≥45 ... /cm, ≥60/p, ≥70/pWater adsorption%: ≥20.5, ≥20.5, ≥20.5, ≥20.5Packing water ...