Properties of Borax
Borax, also known as sodium tetraborate, or disodium tetraborate, is a naturally occurring mineral compound with the chemical formula Na2B4O7·10H2O. It consists of soft, colorless crystals that dissolve easily in water.
The following table provides a comprehensive list of borax properties in both SI and US customary/Imperial units at normal temperature and pressure (NTP).
Note: click on the icon to switch between Metric and Imperial units.
Physical Properties | Metric |
---|---|
Chemical Formula | Na2B4O7·10H2O |
Molar Mass | 381.368 g/mol |
Crystal System | Monoclinic |
Mohs Hardness | 2 - 2.5 |
Density | 1730 - 1900 kg/m3 |
Color | Colorless, white, gray, or greenish white |
Diaphaneity | Translucent to opaque |
Luster | Resinous, greasy |
Cleavage | (100) perfect, (110) perfect |
Fracture | Conchoidal, brittle |
Streak | White |
Thermal Properties | Metric |
Melting Point | 743 °C |
Note: unless stated otherwise, all values are taken at room temperature (approximately 20°C or 68°F) and 1 atm pressure. (1 atm = 101,325 Pa)
Related Pages
References: 1) Cardarelli, François. Materials Handbook: A Concise Desktop Reference. Switzerland: Springer International Publishing, 2018. 2) CRC Handbook of Chemistry and Physics, 97th Edition. United Kingdom: CRC Press, 2016-2017.