1.supply abiasives since 1999 2. Al2O3 purity 99.6% min 3.Refractory material 4.group sizes 12-220 240-1200 # ... the great hardness material, such as the high speed steel, stainless steel and high carbon steel.(2)It also usually used for ... -8mm and 180,200,240,280,320F First grade white fused aluminium