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The chemical formula of aluminium oxide is Al2O3. In this compound, two aluminium atoms bond with two oxygen atoms. The aluminium and oxygen atoms share an equal number of electrons, giving them both a positive charge. As a result, aluminium oxide is a white solid that is insoluble in water. This is a typical characteristic of all inorganic chemical compounds.
Aluminium oxide is found in nature as a number of different minerals including the important bauxite ore. It is used in various chemical, industrial and commercial applications. In its crystalline form known as corundum, it is very hard and can be used as an abrasive or cutting tool. It can also be incorporated into ceramics to improve their mechanical properties. This is particularly important for high-temperature appliances like kilns, furnaces, incinerators, and reactors of many types.
It has excellent corrosion resistance and is unaffected by most acids except hydrofluoric acid. It is also very good at abrasion. This makes it an ideal material for abrasive linings, chute linings, and discharge orifices. It is a key ingredient in ceramics such as alumina, which has the highest strength, hardness, and refractoriness of all the aluminium oxides.
Alumina is also a very effective abrasive and is used to make sandpaper and other abrasives. It is also a popular raw material for the manufacture of chemicals and ceramics. It is also used in vehicle and aircraft armour as well as bulletproof glass. Its strength and lightness are critical for these uses.