Specifications of Sodium Thio Sulphate
| PARAMETERS | SPECIFICATIONS | |
| ANHYDROUS | PENTAHYDRATE | |
| Appearance | White crystalline powder | White crystals |
| Assay% on dry basis | 98.00% min | 98.00% min |
| pH value of aqueous solution | 6.5 to 9.5 | 6.0 to 8.0 |
| Insoluble matter | 0.01% min | 0.01% min |
| Sodium sulphide | 0.001% max | 0.005% max |
| Heavy metals | 0.005% max | 0.003% max |
| Iron | 0.005% max | 0.002% max |
| Loss on drying | 1.5% max | – |
| Sulphur | 39% min | – |
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CAS Number:
ANHYDROUS-7772-98-7
PENTAHYDRATE-10102-17-7 -
Chemical Formula:
ANHYDROUS - Na₂S₂O₃
PENTAHYDRATE - Na₂S₂O₃ 5H₂O
