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Oxide of Aluminum (brown) Electro-fused aluminum oxide, or ELK/NK, has extremely tough and hard grains. Brown fused alumina is created by melting high-quality bauxite at a temperature of more than 2000°C in an electric arc furnace while combining it with iron powder and anthracite. AL2O3, TiO2, and minor amounts of SiO2 and Fe2O3 are the main chemical components. Greater toughness than SiC. The grains appear to be spherical in shape and have a solid, hard feel. It is appropriate for producing high-consolidation abrasive tools made of ceramic and resin as well as for precision casting, sandblasting, polishing, and other processes. Additionally, it can be used to create premium refractory materials.