It is a product manufactured by gradual melting reduction of calcined bauxite in an electric arc furnace at high temperature (approximately 2000 degrees Celsius). Its chemical composition consists mainly of Al₂O₃ (94,5-97%) and vestigal amounts of TiO₂, SiO₂, Fe₂O₃, CaO and MgO.

Brown Aluminium Oxide is characterised by good toughness, high mechanical resistance and hardness (9 in Mohs scale). The microhardness of the material reaches about 1900kG/mm₂. Specific gravity (density) equals 3,90+/-0,05 g/cm₃. Bulk density depending on size equals 1,52-1,87 g/cm₃. It has relatively high thermal conductivity and low thermal expansion. As regards electricity it is an insulator.

Application:

• production of a broad range of abrasive tools, e.g. grinding wheels, abrasive segments, etc. that are designed for processing durable articles, above all for steel processing,
• production of abrasive papers and clothes,
• in fireproof and ceramic industry,
• in sand-blast processing.

Grit sizes are available at Grit sizes.