... refractory products, competitive price, stable quality Brown fused alumina is fused in electric-arc furnace by using carefully selected ... 09% Physical Properties:Color BrownShape BlockyCrystal Form Alpha alumina trigonal systemSpecific Gravity 3.92Hardness 2090 Knoop scale ... 20-10mm, 8-5mm, 5-3mm, 3-1mm, 1-0mm,8/16mesh, 16/30mesh, 30/60mesh,0-100mesh ... .Other packing way upon request. brown fused alumina