(1)chemical composition: Reduction:13% max Fe:o.4% max Al2o3:45% min Na:0.3% max So4+:1.5% max (2)phisical character: Pore volume:0.35ml/g min Specific surface:250m2/g min Abrasion index:2.5% max Fineness: 0--40um:20v% max 0---149um:92v% min (3)micro-activity: 800 degrees/4hr, 100%vapor:70 25 kg/bag
