Alumina, or aluminum oxide, with a molecular weight of 102, is the major source of aluminum in nature. Alumina has very high melting point, which is 2,072 °C and it is extremely hard. Alumina ceramic is the most common technical ceramic material and a relatively traditional material. High purity alumina ceramics as a fine ceramic material is widely used in a lot of industries. This material has superb performances in electrical insulation, high chemical resistance and low thermal expansion. Alumina tubes are used for industrial furnace and thermal couple protector. High purity alumina materials are excellent for making parts for CVD, ion implants, photolithography, and semiconductor parts. In traditional industries, alumina ceramics are ideal for products such as injector tubes, gas nozzles and insulators. Compared with metals, alumina ceramic material is extremely hard, making it an ideal material for abrasive, grinding media. Alumina mortars and pestles are widely used in laboratories for grinding hard materials.
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