Calcined alumina is made into a variety of ceramic products, including spark-plug insulators, integrated-circuit packages, bone and dental implants, laboratory ware, sandpaper grits and grinding wheels, and refractory linings for industrial furnaces. These products exhibit the properties for which alumina is well known, including low electric conductivity, resistance to chemical attack, high strength, extreme hardness (9 on the Mohs hardness scale, the highest rating being 10), and high melting point (approximately 2,050 °C, or 3,700 °F).
Metallurgical alumina, also known as smelter-grade alumina or aluminum oxide, is a type of alumina primarily produced for use in the production of aluminum metal through the Hall-Héroult process. Main applications are Aluminum Smelting, Alumina Refining, Alumina Based Refractories, Cement Production, Abrasives.
