SODIUM METABISULPHITE , PURE
SODIUM METABISULPHITE , PURE
| Article No. | 548708 |
| Grade | AR/ACS |
| Purity | 97% |
| CAS No. | 7681-57-4 |
| Molecular Formula | Na2S2O5 |
| Molecular Weight | 190.10 |
| H.S. Code | 2832.1090 |
| 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 |
Specifications
| Appearance | White crystalline powder |
| Assay | Min. 97.0% |
| Insoluble matter in water | Max. 0.005% |
| Chloride (Cl) | Max. 0.005% |
| Arsenic (As) | Max. 0.0001% |
| Phosphate (PO4) | Max. 0.002% |
| Thiosulphate (S2O3) | Max. 0.05% |
| Heavy metal (as Pb) | Max. 0.001% |
| Iron (Fe) | Max. 0.002% |
| Packings | 500 gm |
