Contact Us
West Ujimqin Banner, Xilingol League, Inner Mongolia, China
© 2025 Alchemist Worldwide Ltd, All Right Reserved
Product Name: Sodium Sulfite
Synonyms: Disodium sulfite, Sodium sulphite
Chemical Formula: Na2SO3
CAS Number: 7757-83-7
Recommended Use: Water treatment, photography, pulp and paper production, food preservative
Supplier Information: Check with your distributor or manufacturer for up-to-date contact numbers.
Emergency Contact: Use local poison control or company-listed emergency number if exposure occurs.
GHS Classification: Not classified as hazardous under GHS standards for pure material
Potential Health Effects: Dust or solution can irritate eyes, skin, or respiratory tract. Ingestion might upset stomach. Individuals with asthma or sulfite sensitivity can have severe reactions including trouble breathing.
Signal Word: None for non-hazardous classification
Hazard Statements: May cause mild irritation or allergic reactions in sensitive people.
Precautionary Statements: Avoid inhaling dust; wash hands after handling; use in well-ventilated places; store away from acids.
Chemical Name: Sodium Sulfite
Concentration: 97 – 100%
Impurities: Some grades contain trace sodium carbonate or sodium chloride from manufacturing.
Other Ingredients: Usually none in technical or pure grades.
Inhalation: Move person to fresh air; offer water and rest. Seek medical help for persistent coughing or wheezing.
Skin Contact: Rinse off with plenty of water, remove contaminated clothes. Consult doctor if irritation appears.
Eye Contact: Flush eyes under running water for 15 minutes. Medical attention if pain, redness or blurred vision linger.
Ingestion: Rinse mouth, give water to drink. Do not induce vomiting; seek medical advice if feeling unwell.
Flammability: Not flammable
Suitable Extinguishing Media: Use any available media for surroundings—foam, dry powder, CO2, or water spray
Specific Hazards: At high heat, releases sulfur dioxide gas with sharp odor that can irritate lungs
Special Protective Equipment: Firefighters should wear full protective gear and self-contained breathing apparatus
Advice for Firefighters: Stay upwind; prevent runoff from entering water supplies
Personal Precautions: Stay away from dust, ventilate area, use personal protective equipment
Spill Cleanup: Sweep up solid material without raising dust. Collect for reuse or disposal in labeled containers.
Environmental Precautions: Avoid letting powder enter drains or local streams
Disposal: Refer to disposal section below. Clean spill area with water after pickup.
Safe Handling: Avoid breathing dust or vapors; minimize skin contact; use goggles if splashing is possible.
Storage Conditions: Store in cool, dry, well-ventilated area. Keep container tightly sealed. Separate from acids and oxidizing agents.
Incompatible Materials: Avoid exposure to strong acids which release hazardous sulfur dioxide gas.
Packing Materials: Use moisture-proof containers for bulk storage.
Occupational Exposure Limits: No OSHA PEL or ACGIH TLV assigned for sodium sulfite; control dust as with nuisance particulates (10 mg/m3)
Ventilation: Use with adequate exhaust or general mechanical ventilation
Personal Protective Equipment: Wear eye protection (safety glasses), gloves made of rubber or neoprene, dust mask for high concentrations
Hygiene Measures: Wash hands before eating, drinking, or smoking; remove and wash contaminated clothing
Appearance: White crystalline powder or granules
Odor: None in solid form, slight sulfur odor in solution
Odor Threshold: Not established
pH (1% solution): 9 – 10
Melting Point: Decomposes before melting
Boiling Point: Not applicable
Solubility in Water: 27 g/100 mL at 20°C
Vapor Pressure: Negligible
Density: Around 2.63 g/cm3
Evaporation Rate: Not applicable
Partition Coefficient: Not available
Chemical Stability: Stable under recommended storage and handling conditions
Conditions to Avoid: Moisture, high heat, exposure to acids
Incompatible Substances: Strong acids, oxidizers
Hazardous Decomposition Products: Sulfur dioxide gas
Hazardous Polymerization: Will not occur
Likely Routes of Exposure: Inhalation, skin, eye contact
Acute Effects: Mild irritation of eyes or skin; headache or nausea if large quantities are swallowed or inhaled
Chronic Effects: Rare asthma-like reactions in sulfite-sensitive individuals
Carcinogenicity: Not listed by IARC, NTP, OSHA as carcinogen
LD50 Oral (rat): About 2,610 mg/kg
Symptoms of Overexposure: Coughing, shortness of breath, stomach upset, rash in sensitive people
Environmental Toxicity: Not believed to be acutely toxic; rapid breakdown in water, especially if well aerated
Aquatic Effects: Large releases can deplete oxygen and harm aquatic life due to sulfur compound breakdown
Persistence and Degradability: Converts naturally to sulfate under normal environmental conditions
Bioaccumulation Potential: Low
Mobility in Soil: High—dissolves and moves with water easily
Waste Treatment Methods: Use local, regional, or national regulations for sulfite waste
Disposal of Product: Small amounts may be diluted and flushed using large amounts of water, if permitted by local regulations
Disposal of Packaging: Rinse containers thoroughly; recycle or dispose of as per local requirements
Special Precautions: Do not dispose of in places where it may contact acids or oxidizers and release gases
UN Number: Not regulated for domestic or international shipping
Proper Shipping Name: Sodium sulfite
Transport Hazard Class: None
Packing Group: None
Hazard Label: None
Special Transport Precautions: Protect packaging from shifting, moisture, and contamination during transport
Chemical Inventory Status: Listed in TSCA, EINECS, and other major chemical inventories
SARA Title III Sections 302/304: Not listed
SARA Title III Sections 311/312: Not considered immediate health or physical hazard
California Proposition 65: Not listed
Other Regulations: Meets purity and labeling standards for chemicals used in food and water treatment in many countries
West Ujimqin Banner, Xilingol League, Inner Mongolia, China
