E 285 SODIUM TETRABORATE (BORAX)
| Synonyms | Sodium borate |
| Definition | |
|---|---|
| Einecs | 215-540-4 |
| Chemical name | Sodium tetraborate; Sodium biborate; Sodium pyroborate; Anhydrous tetraborate |
| Chemical formula | Na2B4O7 Na2B4O7·10H2O |
| Molecular weight | 201,27 |
| Assay | |
| Description | Powder or glass-like plates becoming opaque on exposure to air; slowly soluble in water |
| Identification | |
| Melting range | Between 171 °C and 175 °C with decomposition |
| Purity | |
| Peroxides | No colour develops with added KI-solution |
| Arsenic | Not more than 1 mg/kg |
| Lead | Not more than 5 mg/kg |
| Mercury | Not more than 1 mg/kg |