BLACK FUSED ALUMINA has good features as high hardness, strong tenacity, better bonding ability and hydrophilicity, giving less heat, good self-sharpening, smooth surface and high finish. It's suitable for polishing various spare parts such as: bicycles, sewing-machine, hard metal tools, medical apparatus, timepieces, glass products and stone grinding. It's also the right material for making abrasive tools: fiber-reinforced cutting wheels, grinding wheels, sand cloth, paper and paste. Chemical composition (by weight% ) : Grit Al2O3 SiO2 Fe2O3 TiO2 24# -100# 77. 00min 11. 0min 5. 0min 1. 5-3. 5 120# -200# 75-81 9-12 4-6 2-3 240# -280# , w40 64. 0min 10. 0min 7. 0min 1. 5-3. 0 Available sizes F10-F500 Packing: 25kgs / bag. Hs code: 28182000