What Is Sodium Metabisulfite (SMBS, E223)? Applications, Dosage, Alternatives & Specifications
Last updated: 2026-11-14 · CAS 7681-57-4 · Food Grade
- Quick facts
- Name
- Sodium Metabisulfite (SMBS, E223)
- CAS number
- 7681-57-4
- Grade
- Food Grade
- Certifications
- ISO 9001 · ISO 22000 · HACCP · FAMI-QS · Kosher · Halal · GMP · SGS
- Application areas
- 1
- Documentation
- COA · TDS · SDS
Overview
Sodium Metabisulfite is the sodium salt of pyrosulfurous acid, with the chemical formula Na2S2O5. As the most widely used variety of sulfite additives, it serves multiple functions in food processing including preservation, antioxidant, bleaching, and dough conditioning. Basic Information:
CAS Number: 7681–57–4
EINECS Number: 231–673–0
Applications
Comparison with Other Sulfites
Comparison Dimension
Specification
| Specific Functions and Uses | Market Characteristics and Dosage | |
|---|---|---|
| Food Industry | Preservative, antioxidant, bleaching agent, dough conditioner. Used in wine/fermented beverages (antioxidant), preserves/dehydrated vegetables (color protection), starch syrup (bleaching), biscuits/pastries (dough conditioning). | One of the largest application areas. Wine: SO2 residue ≤50mg/L; dried vegetables: SO2 residue ≤0.1g/kg. |
| Water Treatment | Dechlorination agent, reducing agent. Used for drinking water dechlorination, industrial wastewater treatment. | Reaction: SO2 + Cl2 + 2H2O → H2SO4 + 2HCl; dosage 1–5ppm. |
| Textile and Dyeing | Reducing agent, bleaching agent. Used for fabric bleaching, dye reduction. | Traditional application, stable demand. |
| Paper Industry | Bleaching agent, reducing agent. Used for pulp bleaching. | Stable demand in niche applications. |
| Mining Industry | Flotation agent, depressant. Used for mineral flotation. | Industrial applications. |
| Pharmaceutical Industry | Antioxidant excipient for injections. Used for drug formulation stabilization. | Dosage 0.01%-0.1%. |
| 3.1 Food Industry Applications |
Packaging & Storage
- Packing: 25kg net fiber drum with double PE liner.
- Sample: 100-500g free sample available.
- Storage: Keep in tightly closed packaging, cool, dry, well-ventilated. Protect from light and moisture.
- Shelf Life: 24 months from production date.
Quality & Certifications
Every batch tested by in-house QC lab. COA, TDS, SDS provided with each shipment.
Regulatory & Compliance
EU
Complies with EU regulations and FAMI-QS standards.
USA
Meets FDA and AAFCO requirements.
China
Registered under Chinese MOA regulations.
International
Kosher, Halal, ISO certified. FTA forms available.
Safety & Handling
- Hazard Class: Generally non-hazardous. Refer to SDS for details.
- Storage: Room temperature, dry, sealed. Avoid strong oxidizers.
- Transport: Non-dangerous goods. Standard sea/air freight.
- SDS: Available on request at sales@xadditive.cn.
Frequently asked questions
MOQ?
MOQ is 1kg for trial, 25kg for regular orders. Free samples available.
Shelf life?
24 months from production date when stored properly.
Certifications?
ISO 9001, ISO 22000, HACCP, FAMI-QS, Kosher, Halal, COA, SDS, TDS.
How to get quote?
Email sales@xadditive.cn with your requirement. Reply within 30 minutes.
Request a quote & COA
Ask for the current specification sheet, a COA sample and a bulk quotation — reply within 30 minutes on working days.