1. also known as sodium borate, sodium tetraborate, or disodium tetraborate, is a salt of boric acid. It is usually a white powder consisting of soft colorless crystals that dissolve easily in water.
2. Formula: Na2B4O7·10H2O or Na2[B4O5(OH)4]·8H2O. 
3. Molar mass: 381.37 g/mol
4. Melting point: 743 °C
5. Boiling point: 1,575 °C
6. Density: 1.73 g/cm³
7. Soluble in: water.