| Article No. | 05935 |
| Purity | 96.5% |
| Molecular Formula | Na2S2O5 |
| H.S. Code | 2832.1090 |
| Grade | Extra Pure |
| CAS No. | 7681-57-4 |
| Molecular Weight | 190.10 |
| Shelf Life | 60 Months |
| 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 | ||||
| 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% | 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% |
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Symbol: GHS05, GHS07
Signal Word: Danger
Hazardous Statement: H302-H318
Precaution Statement: P280-P305 + P351 + P338