Description
Sodium Metabisulphite 97% Food Grade
Sodium Metabisulphite 97% Food Grade (CAS 7681-57-4, molecular formula Na2S2O5) is a treatment chemical specified by municipal and industrial plant operators where dose consistency and impurity control directly affect finished water quality. China Chemicals supplies it at 97% min in pack sizes from 1 kg through to 1000 kg Bulk Bag, so laboratory trial quantities and full production volumes can be sourced from the same specification.
It is also traded as SMBS, Sodium Pyrosulphite, E223. Every consignment ships with a batch-specific Certificate of Analysis and the current Safety Data Sheet, and material is stored and picked under stock rotation so you receive product well inside its shelf life.
Typical applications
- Chlorine scavenging ahead of RO membranes
- Oxygen scavenging in boiler feedwater
- Preservative in food and beverage at food grade
- Bleaching in textile and pulp processing
- Mining reagent for cyanide detoxification
Technical specification
| Chemical name | Sodium Metabisulphite 97% Food Grade |
|---|---|
| Synonyms | SMBS, Sodium Pyrosulphite, E223 |
| CAS number | 7681-57-4 |
| Molecular formula | Na2S2O5 |
| Appearance | White crystalline powder, SO2 odour |
| Assay Na2S2O5 | 97.0% min |
| SO2 content | 65% min |
| Iron (Fe) | 10 ppm max |
| Heavy metals as Pb | 5 ppm max |
| Arsenic | 1 ppm max |
| Standard | FCC / E223 compliant |
Values above are typical and are confirmed on the Certificate of Analysis issued against each batch. Tighter specifications can be quoted where a process requires them.
Packaging and supply
Available in 1 kg, 5 kg, 25 kg Bag, 1000 kg Bulk Bag. Bulk, road tanker and export drum quantities are quoted on request, including FOB and CIF terms for international shipment. Pricing shown is per pack in USD, exclusive of freight and any applicable duties.
Handling and safety
Transport classification: UN3260 · Corrosive, Class 8. Store in the original closed container in a cool, well-ventilated area away from incompatible materials, and handle using appropriate personal protective equipment. Read the Safety Data Sheet in full before use — it is issued with every order and is available on request before purchase.
Supply to industry only. Products are sold for legitimate industrial, laboratory and manufacturing use. We may request end-use details and business registration before releasing an order.
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