Potassium Metabisulfite
- CAS Number
- 16731-55-8
- HSN Code
- 28322010
- Molecular Formula
- K2S2O5
- Catalogue Number
- AL01251
- Purity
- ≥ 95%
- Molecular Weight
- 222.31 g/mol
Complies with : IP | BP | USP | EP | ACS
ISO 9001
ISO 14001
GMP
COA with every batch
Key Properties
Potassium metabisulfite, also known as potassium pyrosulfite, is a white crystalline powder that serves as a widely used antioxidant and preservative. It is particularly essential in the winemaking industry, where it helps to prevent oxidation and spoilage of wine. With a purity of 95%, this compound is recognized for its ability to release sulfur dioxide (SO2) when dissolved in water, which acts as a potent antimicrobial agent. Its applications extend beyond winemaking to include food preservation and various laboratory uses, making it a versatile chemical in both industrial and research settings.
Also known as Potassium Pyrosulfite.
- Catalogue No.
- AL01251
- CAS Number
- 16731-55-8
- Molecular Formula
- K2S2O5
- Molecular Weight
- 222.31 g/mol
- HSN Code
- 28322010
- Grade
- 95%
- Product Form
- Substance
Potassium metabisulfite appears as a white crystalline powder with a characteristic pungent sulfurous odor. It has a melting point of approximately 150 °C and is soluble in water, with a solubility of about 10 g/100 mL at 20 °C. The density of potassium metabisulfite is around 1.48 g/cm³. It is important to note that upon heating, it decomposes to release sulfur dioxide, which can be irritating to the respiratory system. The compound is stable under normal conditions but should be stored in a cool, dry place away from incompatible materials.
- Appearance
- White crystalline powder
- Shelf Life
- 2 years
- Packaging
- 25 kg bags
- Storage
- Store in a cool, dry place, away from incompatible materials.
1.1 — Product identifier
- Chemical Name
- Potassium Metabisulfite
- Catalogue No.
- AL01251
- Product form
- Substance
- CAS Number
- 16731-55-8
- EC Number
- 240-440-2
- Grade
- 95%
- EC Index Number
- 016-063-00-2
- Chemical Formula
- K2S2O5
- HSN Code
- 28322010
- Synonyms
- Potassium Pyrosulfite
1.2 — Relevant identified uses of the substance or mixture and uses advised against
- Use of the substance/mixture
- Antioxidant, preservative, reagent
- 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 or when heated.
3.1 — Substance
- Name
- Potassium Metabisulfite
- CAS No.
- 16731-55-8
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
- May emit sulfur dioxide when heated or involved 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. Avoid breathing dust. Use appropriate protective equipment.
6.3 — Methods and material for containment and cleaning up
- Methods for cleaning up
- Contain spill and collect using appropriate methods. 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 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 acids and incompatible materials.
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 vapors are generated.
9.1 — Information on basic physical and chemical properties
- Physical state
- Solid
- Colour
- White
- Odour
- Pungent sulfurous
- Odour threshold
- Not specified
- pH value
- Not specified
- Relative evaporation rate (butylacetate=1)
- Not specified
- Melting point
- 150 °C
- Freezing point
- Not specified
- Boiling point
- Not specified
- 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
- 10 g/100 mL 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; 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
- 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)
- Not classified as dangerous goods
- Proper Shipping Name (IMDG)
- Not classified as dangerous goods
- Proper Shipping Name (IATA)
- Not classified as dangerous goods
- Proper Shipping Name (ADN)
- Not classified as dangerous goods
- Proper Shipping Name (RID)
- Not classified as dangerous goods
14.3 — Transport hazard class(es)
- Transport hazard class(es)
- Not applicable
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
Potassium metabisulfite is primarily used as an antioxidant and preservative in the food and beverage industry, especially in winemaking, where it prevents oxidation and microbial growth. It is also utilized in the preservation of dried fruits and vegetables, as well as in the production of certain pharmaceuticals and cosmetics. In laboratory settings, it serves as a reagent in various chemical reactions and is used in analytical chemistry for its reducing properties. Additionally, it finds applications in the photography industry as a developer and in the textile industry for bleaching processes.
ISO 9001
ISO 14001
GMP
COA with every batch
- Batch Number
- AL-2026-AL01251
- Manufacturing Date
- September-2026
- Expiry Date
- September-2031
- Molecular Weight
- 222.31 g/mol
| Test | Standard | Observed |
|---|---|---|
| Assay | ≥ 95% | 96.5% |
| Moisture Content | ≤ 1% | 0.5% |
| Residue on Ignition | ≤ 0.5% | 0.3% |
| Related Substances | None detected | None detected |
| Solubility | Soluble in water | Soluble |
The above product is expected to comply with 95% grade specification.
Technical Data Sheet
| Grade | Assay/Purity | Melting/Boiling Point | Moisture/LOD | Residue on Ignition | Related Substances | Solubility |
|---|---|---|---|---|---|---|
| 95% | ≥ 95% | 150 °C | ≤ 1% | ≤ 0.5% | None detected | Soluble in water |
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