Brown Fused Alumina.

Brown fused aluminium oxide (artificial corundum)
Brown fused aluminium oxide is fused and crystallized under high temperature from a mixture of bauxite and other raw materials. It is characterized by its high hardness, good toughness and sharp shape in size. Abrasives tools made of it are suitable for grinding metals of high-tensile strength such as carbon steel, general-purpose alloy steel, annealed malleable iron and hard bronze, etc. It also can be used as refractory materials.