As an indispensable raw material for modern industrialization, brown corundum is widely used in modern industrial production. Because of its relatively stable physical and chemical properties and wide application range, the mining industry thinks that the hardness of brown corundum is high, which is mainly determined by its chemical properties: the chemical composition of brown corundum presents a crystal-like ternary system. Chemically, it is not easy to react with strong acid and alkali, and its stability is very good.

The main chemical composition of brown corundum powder is AL2O3, with a content of 94.5%-97%, and a small amount of Fe, Si, Ti, etc. After grinding and shaping by a autogenous mill, iron is removed by magnetic separation and screened into various particle sizes, with dense texture, high hardness and spherical particles. Its main component is alumina, which is classified by aluminum content. The lower the aluminum content, the lower the hardness.

Brown corundum belongs to mineral materials, and the hardness of mineral materials is generally expressed by Mohs hardness, which is between 9.0 and 9.2, and different brown corundum hardness is different. The hardness of brown corundum is closely related to the content of its main component AL2O3, which is also an important factor to determine its purity.