Used as an abrasive in grinding and cutting tools due to its hardness. Common in sandpapers, grinding wheels, and polishing compounds. Serves as a refractory material in high-temperature applications like furnace linings and refractory containers. Acts as a catalyst support in chemical reactions, especially in petroleum refining. Employed in the production of aluminum metal through the Hall-Héroult process. Used in ceramics and cutting tools for its wear resistance, enhancing strength and high-temperature durability including electrical insulators. Found in dental implants and medical prosthetics as a biocompatible coating. Applied in electronics as a dielectric material in integrated circuits and as an insulator in circuit boards due to its thermal conductivity and electrical insulation properties. Used in sunscreen and cosmetics as a thickening or whitening agent. Utilized in thermal spray coatings to increase wear and corrosion resistance on metal components. Produced as alumina fibers for use in lightweight but strong composite materials.