It is released into the environment from manufacturing and welding processes, volcanoes, and sea salt aerosol. Hydrogen fluoride/hydrofluoric acid is used in commercial automotive cleaners, rust removers and inhibitors for ceramics and fabrics, and water spot removers. It is used in the manufacture of silicon semiconductor chips. It is used to remove and inhibit rust, and to etch, polish, and frost glass. It is an intermediate for many chemical reactions and syntheses. Hydrogen fluoride/hydrofluoric acid is used extensively in the extraction, processing, and refining of metals, rock, brick, and oil. For all practical purposes, they are considered the same chemical. DESCRIPTION: Hydrogen fluoride mixes readily with water forming hydrofluoric acid.Hydrofluoric acid that is more than 40% hydrogen fluoride fumes in air. When hydrogen fluoride is combined with water it is known as hydrofluoric acid, a colorless liquid, which in low concentrations is visually indistinguishable from water. APPEARANCE: Hydrogen fluoride is a colorless fuming liquid below 67☏ (19.4☌), or a colorless gas.
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