Specifications
| Chemical Formula | Na2S2O5 |
| Molecular Weight | 190.10 |
| Assay (Na2S2O5) | 96% Min |
| Assay (SO2) | 64% Min |
| Solubility (10% Aqueous Solution) | Clear & colourless solution |
| pH Value of 5% Solution | 3.5 to 4.5 |
| Description | White crystalline powder, free from extraneous matter with a faint odour of sulphur dioxide gas. |