hydrofluosilicic

Hydrofluosilicic acid, also known as fluorosilicic acid or hexafluorosilicic acid, is a chemical compound with the formula H2SiF6. It is a strong acid and a precursor to many fluorine-containing compounds. It is typically encountered as an aqueous solution, appearing as a colorless liquid. The acid is produced industrially as a byproduct of the phosphate fertilizer industry, where it is formed during the processing of phosphate rock with sulfuric acid.

The primary use of hydrofluosilicic acid is in water fluoridation programs. When added to public drinking water supplies in controlled amounts, it is used to help prevent tooth decay. It is also used in other applications, including the processing of aluminum, glass etching, and as a component in some metal surface treatments. While it is a useful industrial chemical, it is corrosive and should be handled with appropriate safety precautions. Exposure can cause irritation to skin, eyes, and the respiratory tract.