Sodium Sulfite
- CAS Number
- 7757-83-7
- HSN Code
- 28321090
- Molecular Formula
- Na2SO3
- Catalogue Number
- AL4281
- Purity
- ≥ 95%
- Molecular Weight
- 126.04 g/mol
Complies with : IP | BP | USP | EP | ACS
ISO 9001
ISO 14001
GMP
COA with every batch
Key Properties
Sodium sulfite is an inorganic sodium salt having sulfite as the counterion. It has a role as a reducing agent and a food preservative.
Also known as Sodium Sulfite Anhydrous, Disodium Sulfite.
- Catalogue No.
- AL4281
- CAS Number
- 7757-83-7
- Molecular Formula
- Na2SO3
- Molecular Weight
- 126.04 g/mol
- HSN Code
- 28321090
- Grade
- 95% Purified Anhydrous
- Product Form
- Substance
Melting point: 911 °C; Density: 2.63 g/cu cm.
- Appearance
- Small crystals or powder
- Shelf Life
- 2 years
- Packaging
- Available in: 500 gm plastic bottle, 5 Kg plastic container, 50 Kg fiber drum
- Storage
- Separated from strong oxidants and acids. Store in an area without drain or sewer access.
1.1 — Product identifier
- Chemical Name
- Sodium Sulfite
- Catalogue No.
- AL4281
- Product form
- Substance
- CAS Number
- 7757-83-7
- EC Number
- 231-821-4
- Grade
- 95% Purified Anhydrous
- EC Index Number
- 016-020-00-8
- Chemical Formula
- Na2SO3
- HSN Code
- 28321090
- Synonyms
- Sodium Sulfite Anhydrous, Disodium Sulfite
1.2 — Relevant identified uses of the substance or mixture and uses advised against
- Use of the substance/mixture
- Reducing agent, antioxidant, 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
2.1 — Classification of the substance or mixture
- Classification according to Regulation (EC) No 1272/2008
- Skin Corr. 1B
- Classification source
- ECHA C&L Inventory via PubChem CID 24437 - hazard classes notified by at least 50% of companies; pictograms and signal word derived from those statements
2.2 — Label elements
- Hazard pictograms
- Corrosive
- Signal word
- Danger
- Hazard statements
- H314: Causes severe skin burns and eye damage
2.3 — Other hazards
- Other hazards
- May cause irritation to skin and eyes.
3.1 — Substance
- Name
- Sodium Sulfite
- CAS No.
- 7757-83-7
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
- IMMEDIATELY flood affected skin with water while removing and isolating all contaminated clothing. Gently wash all affected skin areas thoroughly with soap and water.
- First-aid measures after eye contact
- First check the victim for contact lenses and remove if present. Flush victim's eyes with water or normal saline solution for 20 to 30 minutes while simultaneously calling a hospital or poison control center.
- 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 eyes, skin, and respiratory tract.
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
- Dry powder. Wear self-contained breathing apparatus for firefighting if necessary.
- Unsuitable extinguishing media
- Not specified
5.2 — Special hazards arising from the substance or mixture
- Special procedures
- Sulfur oxides, sodium oxides.
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
- Contain spill and collect using appropriate methods. Dispose of in accordance with local regulations.
6.3 — Methods and material for containment and cleaning up
- Methods for cleaning up
- Personal protection: filter respirator for inorganic gases and vapours adapted to the airborne concentration of the substance. Do NOT let this chemical enter the environment. Sweep spilled substance into covered containers. If appropriate, moisten first to prevent dusting.
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.
- 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
- Separated from strong oxidants and acids. Store in an area without drain or sewer access.
8.2 — Exposure controls
- Hand protection
- Handle with gloves.
- Eye protection
- Use equipment for eye protection tested and approved under appropriate government standards such as NIOSH (US) or EN 166(EU).
- Skin and body protection
- Wear suitable protective clothing
- Respiratory protection
- Use appropriate respiratory protection if dust is generated.
9.1 — Information on basic physical and chemical properties
- Physical state
- Solid
- Colour
- White
- Odour
- Odorless
- Odour threshold
- Not applicable
- pH value
- 9.5 (1% solution)
- Relative evaporation rate (butylacetate=1)
- Not applicable
- Melting point
- 911 °C
- Freezing point
- Not applicable
- Boiling point
- 1450 °C
- Flash point
- Not applicable
- Auto-ignition temperature
- Not applicable
- Decomposition temperature
- Not applicable
- Flammability (solid, gas)
- Non-flammable
- Vapour pressure
- Negligible
- Relative vapour density at 20°C
- Not applicable
- Density
- 2.63 g/cu cm
- Solubility
- 70 g/100 mL in water at 20 °C
- Log Pow
- -4
- 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 reacts with strong acids to release sulfur dioxide.
10.2 — Chemical stability
- Chemical stability
- It is fairly stable and does not oxidize as readily as hydrated sulfite.
10.3 — Possibility of hazardous reactions
- Possibility of hazardous reactions
- Decomposes on heating. This produces toxic and corrosive fumes. The substance is a strong reducing agent.
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
- When heated to decomposition it emits very toxic fumes of Na2O sodium oxide and SOx sulfur oxides.
11.1 — Information on toxicological effects
- Acute toxicity
- LD50 Rat iv 115 mg/kg; LD50 Mouse ip 950 mg/kg; LD50 Mouse iv 130 mg/kg
- Skin corrosion/irritation
- H314: Causes severe skin burns and eye damage
- Serious eye damage/irritation
- Not classified (based on available data)
- Respiratory or skin sensitisation
- Not classified (based on available data)
- Germ cell mutagenicity
- Not classified (based on available data)
- Carcinogenicity
- Not classified (based on available data)
- Specific target organ toxicity (single exposure)
- Not classified (based on available data)
- Specific target organ toxicity (repeated exposure)
- Not classified (based on available data)
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 Sulfite
- Proper Shipping Name (IMDG)
- Sodium Sulfite
- Proper Shipping Name (IATA)
- Sodium Sulfite
- Proper Shipping Name (ADN)
- Sodium Sulfite
- Proper Shipping Name (RID)
- Sodium Sulfite
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 sulfite is widely used as a reducing agent in photographic developer formulations, where it helps to maintain the quality of the images by preventing oxidation of the developing agents. In the food industry, it serves as a preservative, particularly in dried fruits and vegetables, to maintain color and freshness. Additionally, it is utilized in analytical chemistry for the determination of various metal ions and in the treatment of wastewater to remove chlorine. Its applications extend to the textile industry for bleaching processes and in the production of chemicals such as sodium bisulfite.
ISO 9001
ISO 14001
GMP
COA with every batch
- Batch Number
- AL-2026-AL01425
- Manufacturing Date
- September-2026
- Expiry Date
- September-2031
- Molecular Weight
- 126.04 g/mol
| Test | Standard | Observed |
|---|---|---|
| Assay | ≥ 95% | 96.5% |
| Moisture Content | ≤ 1% | 0.5% |
| Residue on Ignition | ≤ 0.5% | 0.3% |
| pH Value | 9.0 - 10.0 | 9.5 |
| Solubility | Soluble in water | Complete dissolution in water |
The above product is expected to comply with 95% Purified Anhydrous grade specification.
Technical Data Sheet
| Grade | Assay/Purity | Melting/Boiling Point | Moisture/LOD | Residue on Ignition | Related Substances | Solubility |
|---|---|---|---|---|---|---|
| 95% Purified Anhydrous | ≥ 95% | m.p. 911 °C | ≤ 1% | ≤ 0.5% | None detected | Soluble in water |
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