alumina abrasive powder 1.excellent quality 2.Competitive price 3.manufacture experience ... ,F46 F60,F80,F120,F180,F220, for refractory: sand in group size :0-1mm, 1-3mm, 3-5mm, 5-8mm ... ItemsPropertyAl2O3 99.55min ColorWhiteSiO2 0.05max Bulk density1.75-1.95g/cm3Na2O 0.20max Grain density3.90g/cm3 minFe2O3 0 ... of magnetic substance0.0023%max... WFA alumina abrasive powder for polishing and blasting