... ; 17%min, Fe: 0.5%max, pH: 3.0min Water Insolubles: 0.15%max Grain size: 2---5mm Use: Used ... sulphate Specification: Al2O3, 15.9%min, Fe: 0.007%max, pH: 3.0min, Water Insolubles, 0.15%max Grain size: 15mm ... , 16%min, Fe: 0.005%max, pH: 3.0min, Water Insolubles: 0.15%max, As: 0.0005%max, Pb: 0 ... Powder Specification: Al2O3: 15.7%min, Fe: 0.5%max, pH: 3.0min, Water Insolubles: 0.15%max Size: Below 10mesh ...