Molekula
Sodium metabisulfite EP Grade
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 EP Grade is a white, crystalline powder used primarily as a preservative, antioxidant, and reducing agent in pharmaceuticals, food processing, and water treatment. It prevents oxidation, controls microbial growth, and dechlorinates water. This European Pharmacopoeia (EP) grade meets strict purity standards for critical applications. CAS 7681-57-4, molecular formula Na₂O₅S₂, molecular weight 190.11 g/mol. Store at ambient conditions. Hazard classification: Danger (corrosive, harmful if swallowed). Molekula supplies Sodium metabisulfite EP Grade 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.
Pricing & pack sizes
Pack sizes & pricing
Pricing on request — packs available from research to bulk quantities.
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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 | White Crystals |
| Grade | Ph. Eur. |
| pH | 3.5 - 5.0 (5% aq.) |
| Chloride (Cl-) | ≤ 0.01% |
| Appearance of Solution | Clear colourless to light yellow |
| Residual Solvents | Excluded by the manufacturing process |
| Heavy Metals (Pb) | ≤ 0.001% |
| Assay (Titration) | ⩾ 97.0% (Iodometric) |
| Iron (Fe) | ≤ 0.0005% |
| Lead (Pb) | ≤ 0.0002% |
| Mercury (Hg) | ≤ 0.0001% |
| Arsenic (As) | ≤ 0.0002% |
| Selenium (Se) | ≤ 0.0003% |
| Identification (RAMAN) | Conforms to Reference |
| Thiosulphate (S2O3) | ≤ 0.05% |
| Sulphur dioxide (SO2) | 65.4 - 67.4% (Iodometric) |
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 | 90035640 |
| 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
-
Corrosive
GHS05
-
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 disulfite
- Sodium metabisulfite
- Sodium pyrosulfite
- sodium pyrosulphite
Frequently asked questions
What is sodium metabisulfite EP grade commonly used for?
Sodium metabisulfite EP grade is primarily used in pharmaceuticals as an antioxidant, preservative, and reducing agent in formulations, as well as in food and beverage applications for sulfiting purposes.
What is the chemical formula and molecular weight of sodium metabisulfite?
The chemical formula is **Na₂O₅S₂**, and the molecular weight is **190.11 g/mol**.
How should sodium metabisulfite EP grade be stored?
Store in a cool, dry, well-ventilated area at ambient temperature, away from incompatible substances like strong oxidizers, and ensure the container is tightly sealed.
Does Molekula supply sodium metabisulfite EP grade in bulk quantities?
Yes, Molekula can supply sodium metabisulfite EP grade in bulk, with quantities tailored to your specific requirements—please contact us for details.
What documentation is provided with an order of sodium metabisulfite EP grade?
Each order includes a Certificate of Analysis (CoA), Material Safety Data Sheet (MSDS), and a batch-specific documentation pack confirming EP-grade compliance.
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.