alumina abrasive powder 1.excellent quality 2.Competitive price 3.manufacture experience 4.high purity white fused ... F10, F16, F24,F36,F46 F60,F80,F120,F180,F220, for refractory: sand in group size :0-1mm, 1-3mm, 3 ... content of magnetic substance0.0023%max... WFA alumina abrasive powder for polishing and blasting