| CAS | 7681-57-4 |
| Molecular Formula | Na2S2O5 |
| Molecular Weight | 190.10 |
| Shelf Life | 60 Months |
| Physical Properties | |||
| Physical State at 20 °C | Solid | Colour | White crystalline |
| Odour | Sulphorous | pH Value | 4.5 at 50 g/l at 20 °C |
| Melting Point/ Freezing Point [°C] | 300 °C | Density [g/cm3] | 1.48 |
| Solubility in Water [% weight] | 650 g/l at 20 °C | Partition Coefficient Log POW Octanol / Water at 20°C | -3.7 |
| Specifications | |||
| Appearance | White crystalline powder | Assay (Iodometric) | 96.5 – 100% |
| Assay (As So2; Iodometric) | 65 – 67.4% | Identity (Acc. To Pharmacopoeias) | Passes test |
| pH (5% Solution in Water) | 3.5 – 5.0 | Appearance of Solution | Passes test |
| Insoluble Matter in Water | Max 0.025% | Residual Solvents | Passes test |
| Chloride (Cl) | Max 0.02% | Thiosulphate (S2O3) | Max 0.05% |
| Heavy Metal (As Pb) | Max 0.002% | Arsenic (As) | Max 0.0004% |
| Iron (Fe) | Max 0.002% | ||
| Dangerous Goods Information | |||
| UN Number | – | DG Class | – |
| Safety Information & Hazard Symbols | |
| Symbol | GHS05, GHS07 |
| Signal Word | Danger |
| Hazard Statement | H302-H318 |
| Precaution Statement | P280-P305 + P351 + P338 |
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