Borax Decahydrate, chemically known as Sodium Tetraborate Decahydrate (Na2B4O7·10H2O), is a naturally occurring mineral and salt of boric acid. It appears as a white crystalline or granular solid and is moderately soluble in water. It is one of the most important boron compounds, valued for its flux properties in glass and ceramics, buffering capacity in industrial processes, and antifungal properties in wood and agricultural applications.