Sulfurous Acid
- CAS Number
- 7782-99-2
- HSN Code
- 28070010
- Molecular Formula
- H2SO3
- Catalogue Number
- AL1493A
- Purity
- > 95%
- Molecular Weight
- 82.08 g/mol
Complies with : IP | BP | USP | EP | ACS
ISO 9001
ISO 14001
GMP
COA with every batch
Key Properties
Sulfurous acid aqueous solution, also known as sulfur dioxide solution, is a reactive reducing acid characterized by its ability to act as a preservative and bleaching agent. This compound is notable for its dual role in both industrial and laboratory settings, where it is utilized for its reducing properties. The aqueous solution is commonly used in various applications, including food preservation and textile chemistry, due to its effectiveness in inhibiting microbial growth and its bleaching capabilities. With a CAS number of 7782-99-2, this product is essential in research and development within the chemical industry.
Also known as Sulfur dioxide solution.
- Catalogue No.
- AL1493A
- CAS Number
- 7782-99-2
- Molecular Formula
- H2SO3
- Molecular Weight
- 82.08 g/mol
- HSN Code
- 28070010
- Grade
- Aqueous solution
- Product Form
- Substance
Sulfurous acid appears as a colorless liquid with a density of 1.03 g/mL. It has a pungent sulfurous odor, characteristic of sulfur dioxide. The boiling point of sulfurous acid is approximately 108 °C, while it does not have a defined melting point as it is typically encountered in solution. It is soluble in water, forming a solution that can release sulfur dioxide gas upon decomposition. The solution is corrosive and can irritate the skin and eyes, necessitating careful handling.
- Appearance
- Colorless liquid
- Shelf Life
- -
- Packaging
- -
- Storage
- Store in a cool, dry place away from incompatible materials.
1.1 — Product identifier
- Chemical Name
- Sulfurous Acid
- Catalogue No.
- AL1493A
- Product form
- Substance
- CAS Number
- 7782-99-2
- EC Number
- 233-315-8
- Grade
- Aqueous solution
- EC Index Number
- 016-020-00-1
- Chemical Formula
- H2SO3
- HSN Code
- 28070010
- Synonyms
- Sulfur dioxide solution
1.2 — Relevant identified uses of the substance or mixture and uses advised against
- Use of the substance/mixture
- Used as a preservative and bleaching 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 sulfur dioxide gas upon decomposition, which is harmful if inhaled.
3.1 — Substance
- Name
- Sulfurous Acid
- CAS No.
- 7782-99-2
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 skin thoroughly with soap and water. Seek medical attention if irritation develops.
- First-aid measures after eye contact
- Rinse cautiously with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing and seek medical attention.
- First-aid measures after ingestion
- Do not induce vomiting. Rinse mouth and seek medical attention immediately.
4.2 — Most important symptoms and effects, both acute and delayed
- Symptoms relating to use
- Irritation of the respiratory tract, skin, and eyes; potential for severe burns.
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
- Corrosive; may produce toxic gases 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
- Neutralize with a suitable alkaline material and absorb with inert material.
6.4 — Reference to other sections
- Reference
- Not specified
7.1 — Precautions for safe handling
- Precautions for safe handling
- Use in a fume hood. Wear gloves and eye protection.
- 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 bases 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 ventilation is inadequate.
9.1 — Information on basic physical and chemical properties
- Physical state
- Liquid
- Colour
- Colorless
- Odour
- Pungent sulfurous odor
- Odour threshold
- Not specified
- pH value
- Not specified
- Relative evaporation rate (butylacetate=1)
- Not specified
- Melting point
- Not applicable
- Freezing point
- Not applicable
- Boiling point
- 108 °C
- 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
- 1.03 g/mL
- Solubility
- Soluble in water
- Log Pow
- Not specified
- Viscosity, kinematic
- Not specified
- Viscosity, dynamic
- Not specified
- Explosive properties
- Not explosive
- Oxidising properties
- Not oxidizing
- Explosive limits
- Not applicable
10.1 — Reactivity
- Reactivity
- Reacts with strong bases 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 bases, oxidizing agents, and reactive metals.
10.6 — Hazardous decomposition products
- Hazardous decomposition products
- Not specified
11.1 — Information on toxicological effects
- Acute toxicity
- Harmful if inhaled; may cause respiratory irritation.
- Skin corrosion/irritation
- Causes skin irritation.
- Serious eye damage/irritation
- Causes serious eye irritation.
- Respiratory or skin sensitisation
- Not a sensitizer.
- Germ cell mutagenicity
- Not classified
- Carcinogenicity
- Not classified
- Specific target organ toxicity (single exposure)
- May cause respiratory irritation.
- 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)
- 1833
- UN-No. (IMDG)
- 1833
- UN-No. (IATA)
- 1833
- UN-No. (ADN)
- 1833
- UN-No. (RID)
- 1833
14.2 — UN proper shipping name
- Proper Shipping Name (ADR)
- Sulfurous Acid
- Proper Shipping Name (IMDG)
- Sulfurous Acid
- Proper Shipping Name (IATA)
- Sulfurous Acid
- Proper Shipping Name (ADN)
- Sulfurous Acid
- Proper Shipping Name (RID)
- Sulfurous Acid
14.3 — Transport hazard class(es)
- Transport hazard class(es)
- 8
14.4 — Packing group
- Packing group (ADR)
- II
- Packing group (IMDG)
- II
- Packing group (IATA)
- II
- Packing group (ADN)
- II
- Packing group (RID)
- II
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
Sulfurous acid aqueous solution is widely used in the food industry as a preservative due to its ability to inhibit the growth of bacteria and fungi. It serves as a bleaching agent in textile chemistry, where it is employed to whiten fabrics and remove color. Additionally, it is utilized in the production of various chemicals, including sulfites and bisulfites, which are important in the manufacturing of paper and in water treatment processes. Its reducing properties make it valuable in analytical chemistry for titrations and other laboratory applications.
ISO 9001
ISO 14001
GMP
COA with every batch
- Batch Number
- AL-2026-AL1493A
- Manufacturing Date
- September-2026
- Expiry Date
- September-2031
- Molecular Weight
- 82.08 g/mol
| Test | Standard | Observed |
|---|---|---|
| Description | A clear colorless liquid | A clear colorless liquid |
| Assay (as SO2) | Min. 5-6% | 6.08% |
| Residue on ignition | <0.002% | 0.001% |
| Arsenic (As) | <0.00005% | <0.00005% |
| Heavy metals (as Pb) | <0.0001% | <0.0001% |
| Chloride (Cl) | <0.0005% | 0.0004% |
| Iron (Fe) | <0.0001% | <0.0001% |
The above product complies with EP grade
Technical Data Sheet
| Grade | Assay/Purity | Melting/Boiling Point | Moisture/LOD | Residue on Ignition | Related Substances | Solubility |
|---|---|---|---|---|---|---|
| Aqueous solution | > 95% | 108 °C | < 5% | < 0.5% | None detected | Completely soluble in water |
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