Borax
Sodium Borate, Sodium Tetraborate, Disodium Tetraborate
| PROPERTIES | |
| Properties | |
| Chemical formula | Na2B4O7·10H2O or Na2[B4O5(OH)4]·8H2O |
| Molar mass | 381.38 (decahydrate)、201.22 (anhydrate) |
| Density | 1.73 g/cm3 (solid) |
| Melting point | 743 °C (1,369 °F; 1,016 K) anhydrate |
| Boiling point | 1,575 °C (2,867 °F; 1,848 K) |
| SPECIFICATION | ||
| Specification | 11S | 11 |
| Appearance | Transparent Granules | White, Odourless, Crystalline Solid |
| Boron Content (As B) | 10.5% Min | 10.5% Min |
| Na2O | 16.25% Typical | 16.25% Typical |
| Matter Insoluble in Water | 1.0% Max | 1.0% Max |
| Bulk Density | 0.90 gm/cc | 0.812 gms/cc |
| Particle size: 1.4mm – 5mm | 95% Min | |
| Solubility in Water: (a) At 20°C | 4.70% | |
| (b) At 100°C | 65.64% | |
| pH @ 20°C: (a) pH 0.1% solution | 9.3 | |
| (b) pH 1.0% solution | 9.2 | |
| Bulk Density (Loose) | ||
| Particle size: (a) +1mm | 0.8% Max | |
| (b) -0.060mm | 4.0% Max | |