... paper,sand cloth,jumbo roll,fused abrown,corundum,brown aluminium oxide Description:AP-17 It is one type of non-calcined ... Brown Fused Aluminium Oxide grain for coated abrasives application, the grain shape is very ... .08%Physical Properties:Color BrownShape Angular, edge sharpCrystal Form Alpha alumina trigonal systemSpecific Gravity 3.92Hardness 2090 Knoop scale, 9.0 ...