| 21. | Aluminium oxide is insoluble in water.
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| 22. | Aluminium anodizing is usually performed in an acid solution, which slowly dissolves the aluminium oxide.
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| 23. | The products are aluminium oxide, free elemental iron, and a large amount of heat.
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| 24. | The outer layers contained glass nanoparticles and aluminium oxide plates were aligned perpendicular to the surface.
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| 25. | Aluminium oxide was taken off the United States Environmental Protection Agency's chemicals lists in 1988.
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| 26. | Aluminium oxide is on EPA's Toxics Release Inventory list if it is a fibrous form.
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| 27. | The major uses of speciality aluminium oxides are in refractories, ceramics, polishing and abrasive applications.
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| 28. | Glass of this class contains essential quantities of boron oxides, aluminium oxides and alkaline earth oxides.
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| 29. | Beryllium and bismuth at similar levels help disrupt the passivation layer of aluminium oxide and promote wetting.
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| 30. | Since the amalgam reacts with air to give aluminium oxide, small amounts of mercury corrode aluminium.
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