Sodium Pyrosulfite 7681-57-4
- CAS No.: 7681-57-4
- Type.: Others
- Appearance: White or light yellow crystalline powder
- Molecular Formula: Na2S2O5
- Shelf Life: 2 Years
- Min Order Quantity: 1 ton
Industrial Grade
Food Grade
Project | Target | Test Result |
Content(As Na2S2O5) (≥) | 97.0% | 97.36% |
SO2 (≥) | 65.0% | 65.91% |
Iron(Fe) (≤) | 0.002 | 0.0017% |
As (≤) | 0.0001% | 0.0001% |
Water Insoluble Matter (≤) | 0.02% | 0.01% |
PB (≤) | 0.0005% | 0.00048% |
PH | 4-4.8 | 4.53 |
Food Grade
Project | Target | Test Result |
Content(As Na2S2O5), % | ≥96.5 | 97.06 |
Iron(Fe), % | ≤0.003 | 0.0014 |
Arsenic (As), % | ≤0.0001 | <0.0001 |
Heavy Metal (Pb), % | ≤0.0005 | <0.0005 |
Water-Insoluble, % | ≤0.05 | 0.03 |

(2) In pharmaceutical industry, Sodium Pyrosulfite is used for the production of chloroform, phenylpropanone and benzaldehyde.

(3) In rubber industry, Sodium Pyrosulfite is used as coagulant.
(4) In printing and dyeing industry, Sodium Pyrosulfite is used as a dechlorination agent for cotton cloth after bleaching, and a cotton textile finishing agent.
(5) In Leather processing and leather industry, Sodium Pyrosulfite can make leather soft, plump and tough, with waterproof, bending resistance, wear resistance and other properties.

(6) In chemical industry Sodium Pyrosulfite is used to produce hydroxyvanillin, hydroxylamine hydrochloride and so on.
(7) In photosensitive industries, Sodium Pyrosulfite is used as developing agents.

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