Sodium tetraborate (Sodium tetraborate, borax, borax, borax, E285) is a salt of weak boric acid and a strong base, a common boron compound, has several crystal hydrates. Chemical formula Na2B4O7.
Sodium tetraborate is used as a component of detergents and cosmetics; in the paper and pharmaceutical industries; in the production of enamels, glazes, optical and colored glasses; as a disinfectant and preservative.