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These materials include copper, aluminum oxide, and hydrogen fluoride, which is used as a propellant in some rocket engines.—Leonard David, Space.com, 13 May 2026 Types of teeth whitening toothpaste formulas Three common agents are used in whitening toothpaste:
Toothpaste with abrasives: Abrasives such as silica, aluminum oxide and calcium pyrophosphate have proved highly effective in buffing out extrinsic stains.—Bestreviews, Chicago Tribune, 24 Apr. 2026 Threats to the ozone layer continue, from, for example, chlorine-containing molecules emitted by massive wildfires and aluminum oxide produced when satellites and other space objects burn up upon reentry into the atmosphere.—Andrea Thompson, Scientific American, 22 Apr. 2026 Using a Whetstone Whetstones (also known as sharpening stones) are flat blocks of abrasive material made from aluminum oxide, ceramics, steel sheets coated with diamond particles, or natural stone.—Randi Gollin, Martha Stewart, 15 Jan. 2026 See All Example Sentences for aluminum oxide