... 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 ... :Color BrownShape Angular, edge sharpCrystal Form Alpha alumina trigonal systemSpecific Gravity 3.92Hardness 2090 Knoop scale ... ISO 6344-2: 1998 brown fused alumina for making sanding cloth jumbo roll