Sodium Metabisulfite
- CAS Number
- 7681-57-4
- HSN Code
- 28321090
- Molecular Formula
- Na2S2O5
- Catalogue Number
- AL1393A
- Purity
- 97%
- 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 (Na2S2O5) is a white crystalline powder that serves as a versatile reducing agent and antioxidant. This AR-grade product is characterized by its high purity of 97%, making it suitable for precise analytical applications. It is commonly used in various industries, including food preservation, photography, and water treatment. The compound is notable for its ability to release sulfur dioxide (SO2) gas upon contact with acids, which is a key feature in its applications as a preservative and antioxidant.
Also known as Disodium disulfite, Sodium pyrosulfite.
- Catalogue No.
- AL1393A
- CAS Number
- 7681-57-4
- Molecular Formula
- Na2S2O5
- Molecular Weight
- 190.10 g/mol
- HSN Code
- 28321090
- Grade
- AR (Analytical Reagent)
- 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), and a boiling point of 190 °C (decomposes). The density of sodium metabisulfite is about 1.48 g/cm³. It is soluble in water, with a solubility of approximately 50 g/L at 20 °C, and has a pH value of around 4.5 in a 1% solution. The compound is hygroscopic, meaning it can absorb moisture from the air, which can affect its stability and performance.
- Appearance
- White crystalline powder
- Shelf Life
- 2 years
- Packaging
- Available in 500 g and 1 kg plastic containers
- Storage
- Store in a cool, dry place, away from moisture and incompatible materials.
1.1 — Product identifier
- Chemical Name
- Sodium Metabisulfite
- Catalogue No.
- AL1393A
- Product form
- Substance
- CAS Number
- 7681-57-4
- EC Number
- 231-673-0
- Grade
- AR
- EC Index Number
- 016-063-00-2
- Chemical Formula
- Na2S2O5
- HSN Code
- 28321090
- Synonyms
- Disodium disulfite, Sodium pyrosulfite
1.2 — Relevant identified uses of the substance or mixture and uses advised against
- Use of the substance/mixture
- Used as a reducing agent, antioxidant, and preservative.
- 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 contact with acids.
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.
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 toxic fumes in a fire.
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. Wear appropriate protective equipment.
6.3 — Methods and material for containment and cleaning up
- Methods for cleaning up
- Contain spill and collect using suitable absorbent material. Dispose of in accordance with local regulations.
6.4 — Reference to other sections
- Reference
- Not specified
7.1 — Precautions for safe handling
- Precautions for safe handling
- Avoid inhalation and contact with skin and eyes. Use in a well-ventilated area.
- 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 acids and moisture.
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 ventilation is inadequate.
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)
- Not flammable
- Vapour pressure
- Not specified
- Relative vapour density at 20°C
- Not specified
- Density
- 1.48 g/cm³
- Solubility
- 50 g/L in water at 20 °C
- Log Pow
- Not specified
- Viscosity, kinematic
- Not applicable
- Viscosity, dynamic
- Not specified
- Explosive properties
- Not explosive
- Oxidising properties
- Not oxidizing
- Explosive limits
- Not applicable
10.1 — Reactivity
- Reactivity
- Stable under normal conditions, but reacts with acids to release sulfur dioxide.
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
- Low 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
- Not a skin sensitizer.
- 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 widely used in the food industry as a preservative and antioxidant, particularly in dried fruits and wines, to prevent browning and spoilage. In analytical chemistry, it serves as a reducing agent in various titrations and reactions. Additionally, it is utilized in the photography industry for developing films and papers, as well as in water treatment processes to remove chlorine. Its ability to release sulfur dioxide makes it effective in controlling microbial growth and oxidation in various applications.
ISO 9001
ISO 14001
GMP
COA with every batch
- Batch Number
- AL-2026-AL1393A
- Manufacturing Date
- September-2026
- Expiry Date
- September-2031
- Molecular Weight
- 190.10 g/mol
| Test | Standard | Observed |
|---|---|---|
| Assay (Purity) | 97% min | 97.5% |
| Moisture Content | < 1% | 0.5% |
| Residue on Ignition | < 0.5% | 0.3% |
| Solubility | 50 g/L in water | 52 g/L |
The above product is expected to comply with AR grade specification.
Technical Data Sheet
| Grade | Assay/Purity | Melting/Boiling Point | Moisture/LOD | Residue on Ignition | Related Substances | Solubility |
|---|---|---|---|---|---|---|
| AR | 97% | 150 °C (decomposes) | < 1% | < 0.5% | None detected | 50 g/L in water at 20 °C |
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