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Aluminium Oxide is a chemical compound of Oxigen and Aluminium. It's formula is Al2O3. In its most commonly occurring crystalline form, called corundum or α-aluminium oxide, its hardness makes it suitable for use as an abrasive and as a component in cutting tools. Al2O3 is an electrical insulater but has a relatively high thermal conductivity for a ceramic material. Aluminium oxide is insoluble in water.

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Aluminum oxide can be made by its reaction with water. (water vapour) 
2Al + 3 H2O --> Al2O3 + 3H2 
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