Low aluminum corundum corundum, also known as black sand, iron ore powder. Black corundum is a new polishing material to a water-Sanshui-and bauxite as raw material made by electric arc furnace smelting temperature. Corundum abrasive particle concentration of the basic black, cutting ability, toughness, hardness and softness, abrasion resistance, high efficiency. Mainly used for stainless steel, metal products, optical glass, bamboo products, polishing and sand blasting, but also a manufacturing resin grinding wheel, cutting disc, emery cloth the new material.