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Samples of ruby, a red variant of corundum.
| IUPAC name
| Systematic IUPAC name
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|Melting point||2,072 °C (3,762 °F; 2,345 K)|
|Boiling point||2,977 °C (5,391 °F; 3,250 K)|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Aluminium oxide or alumina is the chemical compound of aluminum and oxygen, with chemical formula Al2O3. It's the most common and stable form of the aluminium oxides. Aluminium oxide occurs naturally in it's crystalline alpha phase as mineral corundum.
Aluminium oxide is very hard solid (9 Mohs scale). It's electrical insulator.
Aluminium oxide is often present in sandpapers, you can also buy it from mineral collectors as corrundum or gemstones like ruby or saphire.
Heating elements also contain alumina powder which acts as an insulator for the resistance wiring.
Aluminium oxide is a product of thermite reaction:
- M2O3 + 2 Al → Al2O3 + 2 M
No special handling is necessary.
Avoid inhalating the dust. Aluminium oxide isn't flamable or explosive.
Storage in closed bottles is adequate.
Aluminium oxide could be safely dumped with normal trash or spilled out in a soil.