Molekula
Sodium metabisulfite
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 2000 · Listed pack sizes are a starting point — we manufacture, source and repack to the quantity you need
Sodium metabisulfite is a white crystalline powder used as a reducing agent, preservative, and antioxidant in food, pharmaceuticals, and industrial processes. It is also employed in photographic chemicals and water treatment. CAS: 7681-57-4, Molecular Formula: Na2O5S2, Molecular Weight: 190.11 g/mol, Storage: Ambient, Signal Word: Danger. Molekula supplies Sodium metabisulfite from research to bulk quantities with full documentation and ISO 9001:2015 traceability.
Example image for illustration only. Other packaging and pack sizes are available.
Often bought together
Pricing & pack sizes
These pack sizes aren't a limit. Molekula manufactures, sources and repacks to order — if you need 500 kg and only see 1 kg listed, . We quote from grams to multi-tonne.
Need a different size? Add the nearest pack and change the size in your basket — we price it at the same rate per unit.
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500 g — £20.00 per pack ex VAT · £24.00 inc. VAT
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1 kg — £26.40 per pack ex VAT · £31.68 inc. VAT
Need a different quantity or pack?
Tell us how much you need and when — drums, IBCs, sacks or a one-off bulk lot. We'll manufacture or source it and come back with a price.
Prices exclude VAT/sales tax and shipping.
Specifications
| Property | Value |
|---|---|
| Appearance | Fine Crystals |
| Heavy metals | ≤10mg/kg |
| Identification | Conforms to reference |
| Assay | ≥98.5% |
| Cadmium (Cd) | ≤0.05 mg/kg |
| Iron (Fe) | ≤3mg/kg |
| Lead (Pb) | ≤0.5mg/kg |
| Mercury (Hg) | ≤0.1 mg/kg |
| Arsenic (As) | ≤0.5 mg/kg |
| Nickel (Ni) | ≤1.0 mg/kg |
| Chromium (Cr) | ≤1.0 mg/kg |
| Antimony (Sb) | ≤1.0 mg/kg |
| Selenium (Se) | ≤0.5 mg/kg |
| Thiosulphate (S2O3) | ≤0.05% |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Acidity | Neutral |
Literature values
Published physical properties of the substance, not batch specifications.
| Property | Value |
|---|---|
| Appearance | White hexagonal crystals or powder |
| Solubility (other solvents) | Freely soluble in water, glycerol; slightly soluble in alcohol |
Source: PubChem CID 656671 (HSDB)
Identification
| Property | Value |
|---|---|
| SKU | 33231649 |
| CAS Number | 7681-57-4 |
| EC Number | 231-673-0 |
| Molecular Formula | Na2O5S2 |
| Molecular Weight | 190.11 |
| Exact Mass | 189.8983 |
| SMILES | [O-]S(=O)S(=O)(=O)[O-].[Na+].[Na+] |
| InChIKey | HRZFUMHJMZEROT-UHFFFAOYSA-L |
| InChI | InChI=1S/2Na.H2O5S2/c;;1-6(2)7(3,4)5/h;;(H,1,2)(H,3,4,5)/q2*+1;/p-2 |
| PubChem CID | 656671 |
| REACH Code | Y110 |
| TSCA Listed | Yes |
| HTS Code | 28321000 |
| Tariff Code | 2832100000 |
Safety & GHS
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Corrosive
GHS05
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Health Hazard
GHS07
Hazard statements
- EUH031 Contact with acids liberates toxic gas
- H302 Harmful if swallowed
- H318 Causes serious eye damage
Precautionary statements
- P264 Wash thoroughly after handling
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P301+312 IF SWALLOWED: Call a POISON CENTER or doctor/physician if you feel unwell
- P305+351+338 IF IN EYES: Rinse with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing
- P333+313 IF skin irritation or a rash occurs: Get medical advice/attention
- P337+313 If eye irritation persists get medical advice/attention
Documents
Safety Data Sheets (SDS)
Available in English, French, German, Italian, Spanish.
Certificate of Analysis (CoA) by batch
Enter a lot or batch number to retrieve the CoA for that specific batch. We can generate one from spec data if no PDF is on file.
Synonyms
- Campden Tablets
- Disodium metabisulfite
- Disodium pyrosulfite
- Natrii disulfis
- Natrium pyrosulfit
- Natriummetabisulfit
- Sodium bisulfite anhydrous
- Sodium disulfite
- Sodium pyrosulfite
- sodium pyrosulphite
Frequently asked questions
What is sodium metabisulfite used for?
Sodium metabisulfite is commonly used as a preservative in food and beverages, a reducing agent in chemical processes, and in water treatment to control microbial growth.
What is the chemical formula and molecular weight of sodium metabisulfite?
The formula is Na2O5S2 and the molecular weight is 190.11 g/mol.
How should sodium metabisulfite be stored?
It should be stored at ambient temperature in a dry, well-ventilated area away from incompatible materials.
What grade is available for sodium metabisulfite?
Available in technical and food-grade qualities; specific grades depend on customer requirements and application.
Can Molekula supply sodium metabisulfite in bulk?
Yes, Molekula can supply sodium metabisulfite in bulk quantities; please contact our sales team for pricing and availability.
What documentation comes with a sodium metabisulfite order?
Each order includes a Certificate of Analysis (CoA) and Safety Data Sheet (SDS); additional documentation can be provided upon request.
Ready to order or need a custom pack?
Tell us the product, grade, and quantity — Molekula usually responds within one working day with pricing and lead time.