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| Sodium metabisulphite |
| English name |
Sodium metabisulphite |
| Molecular formula |
Na2S2O5 |
| Molecular weight |
190.1 |
| Properties |
white or light yellow crystal powder or little crystal. Specific gravity is 1.4. It dissolves in water and not in alcohols. It can decompose sulfur dioxide when the temperature is above 150℃. |
| Use |
widely used in medicine, food, rubber, textile, vegetable, etc. |
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| Technical index |
High puritylevel |
Industrial level |
Food level |
| Sodium metabisulphite |
Excellent grade product |
Sodium metabisulphite |
| Na2S2O5 ≥ % |
97.5 |
96.0 |
96.0 |
| Iron(Fe) ≤ % |
0.003 |
0.005 |
0.005 |
| Water insoluble matter ≤ % |
0.01 |
0.05 |
0.03 |
| Chlorid(Cl) ≤ % |
0.003 |
-- |
-- |
| Heavy metal(Pb) ≤ % |
0.001 |
-- |
0.001 |
| Arsenic(As) ≤ % |
0.0001 |
0.0001 |
0.0001 |
| PH value |
3.2-4.6 |
— |
3.2-4.6 |
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