Description

Sulfamic acid is a white crystalline solid, stable and non-hygroscopic. It is soluble in water and formamide and slightly soluble in methanol, ether, acetone and concentrated sulphuric acid. It is classified as a strong inorganic acid and is produced commercially from urea and fuming sulphuric acid. A dilute aqueous solution of the acid is stable for a long time at room temperature, but undergoes rapid hydrolysis at high temperatures. Its solutions are less corrosive to metals than other inorganic acids such as hydrochloric acid.

Sulfamic acid is used as an acid cleaner, usually for metals and ceramics. It is an alternative to hydrochloric acid for rust removal. It is often used as a descaling agent in detergents, cleaners and toilet cleaners to remove limescale.