Chemical Product Library / Reference
Sodium metabisulfite
Chemical identity, technical indicators, performance and application reference. Confirm specifications and regulatory suitability against supplier documentation.
Chemical identity
| English name | Sodium metabisulfite |
|---|---|
| English synonyms | Sodium metabisulfite;Sodium pyrosulfite;SMBS |
| Chinese name | 焦亚硫酸钠 |
| Chinese synonyms | 偏重亚硫酸钠;焦亚硫酸钠;SMBS |
| Chemical category | Food Acids & Regulators |
| CAS No. | 7681-57-4 |
| EINECS No. | 231-673-0 |
| Molecular formula | Na2S2O5 |
| Molecular weight | 190.11 |
PubChem structure images are reference depictions, not proof of composition, purity, grade, or regulatory status. Mixtures and polymers may not have a single representative structure.
Technical indicators
Assay ≥97.0% (as SO2); water-insoluble matter ≤0.05%; iron ≤0.005%; heavy metals (as Pb) ≤5 ppm
Performance characteristics
White crystalline powder, soluble in water, strong reducing and bleaching properties
Application scenarios
Food preservative and antioxidant (wine, dried fruits), water treatment, photographic chemicals, textile bleaching