brown fused alumina FEPA P grit, for making premium quality jumbo roll,sanding ... .80% Physical Properties:Color RedShape Angular, edge sharpCrystal Form Alpha alumina trigonal systemSpecific Gravity 3.94Hardness 2090 Knoop scale, 9.0 ... brown fused aluminium oxide,fused brown corundum,corundum,brown fused alumina,brown aluminium oxide,fused alumina brown fused alumina FEPA P grit