Potassium Metabisulphite 95% Extrapure
Potassium pyrosulfite; Dipotassium disulfite
Product Code. |
02138 |
Grade |
|
Purity |
95% |
CAS No. |
16731-55-8 |
Molecular Formula |
K2S2O5 |
Molecular Weight |
222.31 |
H.S.Code |
2832.20100 |
Shelf Life |
60 Months |
Physical Properties
| Physical state at 20 °C |
Solid |
Colour |
White crystalline |
Odour |
Odorless |
| pH value |
3-4.5 at 22.2 g/l at 25 °C |
Melting point/ Freezing point [°C] |
150°C |
Decomposition point [°C] |
150°C |
| Vapour density |
2.3 |
Density [g/cm3] |
2.34 |
Solubility in water [% weight] |
22.2 g/l at 20 °C |
Packaging
Specification
| Appearance | White crystalline powder |
| Assay (iodometric) | 95 - 99.9% |
| Iodometric,SO2 | 54.8 - 57.6% |
| Appearance of solution | Passes test |
| pH (5% solution in water) | 3 - 4.5 |
| Chloride (Cl) | Max 0.05% |
| Heavy metal (as Pb) | Max 0.001% |
| Thiosulphate | Passes test |
| Copper (Cu) | Max 0.0025% |
| Zinc (Zn) | Max 0.0025% |
| Iron (Fe) | Max 0.002% |
| Selenium (Se) | Max 0.0005% |
| Arsenic (As) | Max 0.0002% |
| Mercury (Hg) | Max 0.0001% |
Safety Information and Hazard Symbols
Symbol: GHS07
Signal Word: Warning
Hazardous Statement: H315-H319-H335
Precaution Statement: P261-P305 + P351 + P338