Sodium Metabisulfite
- CAS Number
- 7681-57-4
- HSN Code
- 28321090
- Molecular Formula
- Na2S2O5
- Catalogue Number
- AL01393
- Purity
- 96.5%
- Molecular Weight
- 190.10 g/mol
Complies with : IP | BP | USP | EP | ACS
ISO 9001
ISO 14001
GMP
COA with every batch
Key Properties
Sodium metabisulfite (extra pure, sodium disulfite) is a widely used antioxidant and preservative, particularly essential in winemaking and food preservation. It is a white crystalline powder that is highly soluble in water, making it easy to incorporate into various formulations. With a purity of 96.5%, this grade is suitable for applications requiring high-quality standards, such as food and beverage production. Its ability to release sulfur dioxide (SO2) upon dissolution makes it effective in preventing oxidation and microbial growth, thus extending the shelf life of products.
Also known as Sodium disulfite, Sodium pyrosulfite.
- Catalogue No.
- AL01393
- CAS Number
- 7681-57-4
- Molecular Formula
- Na2S2O5
- Molecular Weight
- 190.10 g/mol
- HSN Code
- 28321090
- Grade
- Extra Pure
- Product Form
- Substance
Sodium metabisulfite appears as a white crystalline powder with a pungent sulfurous odor. It has a melting point of approximately 150 °C (decomposes), a boiling point of 190 °C (decomposes), and a density of about 1.48 g/cm³. The compound is highly soluble in water, with a solubility of approximately 50 g/100 mL at 20 °C. It has a pH value of around 4.5 in a 1% solution, indicating its acidic nature. The compound is not flammable but can release irritating sulfur dioxide gas when heated or in contact with acids.
- Appearance
- White crystalline powder
- Shelf Life
- 2 years
- Packaging
- 25 kg bags
- Storage
- Store in a cool, dry place, away from moisture and incompatible materials.
1.1 — Product identifier
- Chemical Name
- Sodium Metabisulfite
- Catalogue No.
- AL01393
- Product form
- Substance
- CAS Number
- 7681-57-4
- EC Number
- 231-673-0
- Grade
- Extra Pure
- EC Index Number
- 016-063-00-2
- Chemical Formula
- Na2S2O5
- HSN Code
- 28321090
- Synonyms
- Sodium disulfite, Sodium pyrosulfite
1.2 — Relevant identified uses of the substance or mixture and uses advised against
- Use of the substance/mixture
- Antioxidant, preservative, reducing agent
- Uses advised against
- Not specified
1.3 — Details of the supplier of the safety data sheet
- Company identification
- Address:- 102, B wing, Savgan Heights, RTO Lane,Andheri (W), Mumbai-400 053Maharashtra, India.
1.4 — Emergency Contact Details
- Phone / e-Mail
- Phone : +91 22 26317055 Mobile : +91 9820385757 e-mail : info@alphachemika.co.in
2.3 — Other hazards
- Other hazards
- Releases irritating sulfur dioxide gas upon decomposition.
3.1 — Substance
- Name
- Sodium Metabisulfite
- CAS No.
- 7681-57-4
4.1 — Description of first aid measures
- First-aid measures after inhalation
- Move to fresh air. If symptoms persist, seek medical attention.
- First-aid measures after skin contact
- Wash with soap and water. If irritation occurs, seek medical attention.
- First-aid measures after eye contact
- Rinse cautiously with water for several minutes. Remove contact lenses if present and easy to do. If irritation persists, seek medical attention.
- First-aid measures after ingestion
- Rinse mouth. Do not induce vomiting. Seek medical attention if symptoms occur.
4.2 — Most important symptoms and effects, both acute and delayed
- Symptoms relating to use
- Irritation of the respiratory tract, skin, and eyes; potential allergic reactions.
4.3 — Indication of any immediate medical attention and special treatment needed
- General information
- Treat symptomatically. Show this safety data sheet to the treating physician.
5.1 — Extinguishing media
- Suitable extinguishing media
- Water spray, carbon dioxide, dry chemical powder, foam.
- Unsuitable extinguishing media
- Not specified
5.2 — Special hazards arising from the substance or mixture
- Special procedures
- Non-flammable, but may release sulfur dioxide when heated.
5.3 — Advice for firefighters
- Protection during firefighting
- Do not enter fire area without proper protective equipment, including respiratory protection.
6.1.1 — For non-emergency personnel
- Emergency procedures
- Evacuate area and ventilate. Avoid dust formation. Use appropriate personal protective equipment.
6.3 — Methods and material for containment and cleaning up
- Methods for cleaning up
- Collect spillage and dispose of in accordance with local regulations. Avoid release into the environment.
6.4 — Reference to other sections
- Reference
- Not specified
7.1 — Precautions for safe handling
- Precautions for safe handling
- Avoid contact with skin and eyes. Use in a well-ventilated area. Wear appropriate personal protective equipment.
- Hygiene measures
- Wash hands and other exposed areas with mild soap and water before eating, drinking or smoking and when leaving work.
7.2 — Conditions for safe storage, including any incompatibilities
- Storage conditions
- Store in a cool, dry place, away from incompatible materials such as strong acids and oxidizers.
8.2 — Exposure controls
- Hand protection
- Protective gloves (e.g. nitrile rubber)
- Eye protection
- Chemical safety goggles or safety glasses
- Skin and body protection
- Wear suitable protective clothing
- Respiratory protection
- Use appropriate respiratory protection if dust or mist is generated.
9.1 — Information on basic physical and chemical properties
- Physical state
- Solid
- Colour
- White
- Odour
- Pungent sulfurous
- Odour threshold
- Not specified
- pH value
- 4.5 (1% solution)
- Relative evaporation rate (butylacetate=1)
- Not specified
- Melting point
- 150 °C (decomposes)
- Freezing point
- Not specified
- Boiling point
- 190 °C (decomposes)
- Flash point
- Not applicable
- Auto-ignition temperature
- Not applicable
- Decomposition temperature
- Not specified
- Flammability (solid, gas)
- Non-flammable
- Vapour pressure
- Not specified
- Relative vapour density at 20°C
- Not specified
- Density
- 1.48 g/cm³
- Solubility
- 50 g/100 mL (at 20 °C)
- Log Pow
- Not specified
- Viscosity, kinematic
- Not applicable
- Viscosity, dynamic
- Not applicable
- Explosive properties
- Not explosive
- Oxidising properties
- Not oxidizing
- Explosive limits
- Not applicable
10.1 — Reactivity
- Reactivity
- Stable under normal conditions, but may react with strong acids and oxidizing agents.
10.2 — Chemical stability
- Chemical stability
- Stable under recommended storage conditions.
10.3 — Possibility of hazardous reactions
- Possibility of hazardous reactions
- No dangerous reactions known under normal conditions of use.
10.4 — Conditions to avoid
- Conditions to avoid
- Avoid contact with incompatible materials and excessive heat.
10.5 — Incompatible materials
- Incompatible materials
- Strong acids, strong oxidizers.
10.6 — Hazardous decomposition products
- Hazardous decomposition products
- Not specified
11.1 — Information on toxicological effects
- Acute toxicity
- LD50 (oral, rat) > 2000 mg/kg.
- Skin corrosion/irritation
- May cause skin irritation.
- Serious eye damage/irritation
- Causes serious eye irritation.
- Respiratory or skin sensitisation
- May cause allergic skin reactions in sensitive individuals.
- Germ cell mutagenicity
- Not classified
- Carcinogenicity
- Not classified
- Specific target organ toxicity (single exposure)
- Not classified as a specific target organ toxicant.
- Specific target organ toxicity (repeated exposure)
- Not classified
12.1 — Toxicity
- Toxicity information
- Not specified
12.2 — Persistence - degradability
- Persistence - degradability
- Not specified
12.3 — Bioaccumulative potential
- Bioaccumulative potential
- Not specified
12.4 — Mobility in soil
- Mobility in soil
- Not specified
12.6 — Other adverse effects
- Environmental precautions
- Not specified
13.1 — Waste treatment methods
- Additional Info
- Dispose of contents/container in accordance with local, regional, national and international regulations.
14.1 — UN number
- UN-No. (ADR)
- Not assigned
- UN-No. (IMDG)
- Not assigned
- UN-No. (IATA)
- Not assigned
- UN-No. (ADN)
- Not assigned
- UN-No. (RID)
- Not assigned
14.2 — UN proper shipping name
- Proper Shipping Name (ADR)
- Sodium Metabisulfite
- Proper Shipping Name (IMDG)
- Sodium Metabisulfite
- Proper Shipping Name (IATA)
- Sodium Metabisulfite
- Proper Shipping Name (ADN)
- Sodium Metabisulfite
- Proper Shipping Name (RID)
- Sodium Metabisulfite
14.3 — Transport hazard class(es)
- Transport hazard class(es)
- Not classified as hazardous for transport
14.4 — Packing group
- Packing group (ADR)
- Not applicable
- Packing group (IMDG)
- Not applicable
- Packing group (IATA)
- Not applicable
- Packing group (ADN)
- Not applicable
- Packing group (RID)
- Not applicable
14.5 — Environmental hazards
- Dangerous for the environment
- Not specified
- Marine pollutant
- Not specified
- Other information
- No supplementary information available
15.1 — Safety, health and environmental regulations/legislation specific for the substance or mixture
- 15.1.1 EU-Regulations
- Not specified
Sodium metabisulfite is primarily used as an antioxidant and preservative in the food and beverage industry, particularly in winemaking, where it helps to prevent oxidation and spoilage. It is also utilized in the preservation of dried fruits and vegetables, as well as in the production of certain pharmaceuticals and cosmetics. Additionally, it serves as a reducing agent in various chemical processes and is employed in water treatment to remove chlorine. Its versatility makes it a valuable compound in both industrial and laboratory settings.
ISO 9001
ISO 14001
GMP
COA with every batch
- Batch Number
- AL-2026-AL01393
- Manufacturing Date
- September-2026
- Expiry Date
- September-2031
- Molecular Weight
- 190.10 g/mol
| Test | Standard | Observed |
|---|---|---|
| Assay | 96.5% min | 96.8% |
| Moisture Content | < 1.0% | 0.5% |
| Residue on Ignition | < 0.5% | 0.3% |
| Related Substances | None detected | None detected |
| Solubility | 50 g/100 mL | 52 g/100 mL (at 20 °C) |
The above product is expected to comply with Extra Pure grade specification.
Technical Data Sheet
| Grade | Assay/Purity | Melting/Boiling Point | Moisture/LOD | Residue on Ignition | Related Substances | Solubility |
|---|---|---|---|---|---|---|
| Extra Pure | 96.5% | 150 °C (decomposes) | < 1.0% | < 0.5% | None detected | 50 g/100 mL (at 20 °C) |
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