About this product
Sodium Meta Bi Sulphite — commonly written sodium metabisulphite and traded as SMBS — is a white crystalline powder with the formula Na2S2O5 (CAS 7681-57-4). It works as a reducing agent and oxygen scavenger, and as a source of sulphur dioxide in solution. We stock Industrial Grade (Superior) material at 96.0% mass minimum Na2S2O5 in 25 kg and 50 kg bags, backed by the manufacturer's Certificate of Analysis, and dispatch it from our Redhills, Chennai warehouse across South India.
Applications & Uses
Safety & Technical Documents
MSDS / SDS
TDS / COA
Certificate of Analysis · with every supply, on request
Product DataTechnical Specifications
Physical Properties
- Appearance
- White crystalline powder
- Purity
- 96.0% mass min (Na2S2O5)
- Assay
- Content (Na2S2O5) 96.0% mass min; SO2 Content 66.0% mass min; Iron (Fe) 0.003% mass max; Arsenic (As) 0.0001% mass max; Water insoluble matter 0.05% mass max
Supply & Packaging
- Packaging
- 25 kg bag50 kg bag
- Grades Available
- Industrial Grade (Superior)
- Origin
- Imported
Compliance & Storage
- HS Code
- 2832 10 00
- Storage
- Cool, dry, well-ventilated area away from acids. Keep containers sealed — releases sulphur dioxide (SO2) on contact with acids or moisture.
These specs are indicative. Request a Certificate of Analysis (COA) for batch-specific values.
Source Manufacturers
Sourced directly from verified manufacturers for consistent quality and traceability.
Supplied across South IndiaCoimbatore · Madurai · Hosur · Bangalore · Hyderabad · Visakhapatnam · Kochi
Frequently Asked Questions
What is sodium metabisulphite (SMBS) used for?
Sodium metabisulphite acts as a reducing agent and oxygen scavenger, and as a source of sulphur dioxide in solution. We supply it as Industrial Grade (Superior) white crystalline powder for those duties.
What is the CAS number and chemical formula of sodium meta bi sulphite?
The CAS number is 7681-57-4 and the chemical formula is Na2S2O5. Our spec sheet reports the assay as Content (Na2S2O5), 96.0% mass minimum.
Is SMBS the same as sodium metabisulphite?
Yes. SMBS is the common trade abbreviation for sodium metabisulphite, also written sodium meta bi sulphite. It is also known as sodium pyrosulphite or disodium metabisulfite.
What is the industrial grade specification of sodium metabisulphite — purity and SO2 content?
Our Industrial Grade (Superior) material runs Content (Na2S2O5) 96.0% mass minimum and SO2 Content 66.0% mass minimum. Iron (Fe) is 0.003% mass maximum, Arsenic (As) 0.0001% mass maximum and water insoluble matter 0.05% mass maximum, with values drawn from the manufacturer's Certificate of Analysis.
What packing is sodium metabisulphite available in, and can I buy it in Chennai?
We stock it in 25 kg and 50 kg bags at our Redhills, Chennai warehouse and dispatch across South India. The material is imported. HSN is 2832 10 00; order sizes depend on packaging and current stock. Call or WhatsApp +91 86087 80096 for a quote.
How should sodium metabisulphite be stored and handled?
It releases sulphur dioxide (SO2) on contact with acids or moisture and is irritating to eyes, skin and the respiratory tract. Store it in a cool, dry, well-ventilated area away from acids and keep containers sealed. Our TDS (SPC-TDS-PWD-009) and MSDS are both downloadable from this page.
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Product Details
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