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Al2O3 92% min Appearance White sphere Dew point -70 ℃ BET m2/g 280 min SiO2 0.1% max Fe2O3 0.04% max Na2O 0.45% max L.O.I 7% max BulkGravity(g/cm3) 0.75-0.85 Absorption rate(60%RH) 20% min Porosity volume (ml/g) 0.40 min Crush Strength 120(N/sphere) min Abrasion(%) 0.2 max