In addition to its use in the production of primary aluminum, aluminum oxide has other key industrial uses. Alumina is often used as a filler for plastics. The compound is also widely used as an abrasive and is a less-expensive substitute for industrial diamond. Aluminum oxide flakes produce reflective effects within the paint used on automobiles. The largest scale use of alumina occurs in refineries, where the aluminum oxide compound is used to convert dangerous hydrogen sulfide waste gases into elemental sulfur.
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