© 2026 Nanjing Finechem Holdings Co., Ltd,
All Right Reserved
Product Name: Sodium Sulfite
Synonyms: Disodium sulfite, Sodium sulphite
Chemical Formula: Na2SO3
CAS Number: 7757-83-7
Recommended Uses: Used in water treatment, pulp and paper industry, and as a preservative in food processing
Supplier Details: Manufacturer and contact address provided with shipment
Emergency Contact: Local poison control center or supplier’s emergency line
GHS Classification: Not classified as hazardous under GHS, but can irritate eyes, skin, and respiratory system
Health Hazards: May trigger asthma-like reactions in sensitive individuals, causes irritation on skin and eyes, can provoke coughing and shortness of breath upon inhalation
Environmental Hazards: Toxic to aquatic life in high concentrations, releases sulfur oxides on decomposition
Label Elements: May require exclamation mark pictogram for irritant
Precautionary Statements: Avoid breathing dust, wash exposed skin thoroughly after handling, use in well-ventilated areas
Chemical Name: Sodium Sulfite
CAS Number: 7757-83-7
Percent by Weight: 98% minimum
Impurities: Sodium sulfate (<1%), traces of water (as hydrate form), trace metals less than 0.5%
Inhalation: Move person to fresh air immediately, support breathing if necessary, seek medical help if symptoms linger
Skin Contact: Rinse skin with plenty of water, remove contaminated clothing, wash area thoroughly, seek medical advice for persistent irritation
Eye Contact: Flush eyes with water for several minutes, holding eyelids open, get medical attention for ongoing discomfort or visual disturbances
Ingestion: Rinse mouth with water, do not induce vomiting, seek immediate medical attention
Suitable Extinguishing Media: Use foam, dry chemical, or carbon dioxide to extinguish nearby fires
Unsuitable Extinguishing Media: Do not use water streams directly on burning material as it may promote dust formation
Specific Hazards: May emit hazardous sulfur oxides (SO2) when heated or involved in fire
Protective Equipment: Firefighters should use full protective clothing and self-contained breathing apparatus
Firefighting Instructions: Prevent runoff from entering drains, cool containers with water spray from a safe distance
Spill Procedure: Wear appropriate personal protective equipment, avoid dust formation, ventilate area
Containment: Prevent material from entering waterways, cover drains, use physical barriers
Cleanup: Sweep or shovel spilled material into suitable containers, avoid raising dust, thoroughly wash spill area with water after cleanup
Disposal: Dispose of collected material in compliance with local regulations
Handling: Use only with adequate ventilation, wear appropriate personal protective gear, avoid contact with skin, eyes, and clothing, do not breathe dust
Storage: Keep containers tightly closed in a dry, cool, well-ventilated location, store away from acids and oxidizers, use corrosion-resistant containers
Special Precautions: Ground and bond containers when transferring material, keep away from food and feeding stuffs, segregate from incompatible substances
Occupational Exposure Limit: No specific OSHA PEL or ACGIH TLV designated; limit dust exposure as for nuisance particulates
Engineering Controls: Install local exhaust ventilation if dust present, ensure safe eyewash and shower facilities nearby
Personal Protective Equipment: Wear chemical-resistant gloves, safety goggles or face shield, and dust respirator where necessary
Hygiene Measures: Do not eat, drink, smoke while using this product; always wash hands after handling and before breaks or meals
Appearance: White crystalline powder or granules
Odor: Faint sulfurous odor
pH: 9 (1% solution in water)
Melting Point: Decomposes above 150°C (302°F)
Boiling Point: Not applicable (decomposes before boiling)
Solubility in Water: Readily soluble (27g/100mL at 25°C)
Density: About 2.63 g/cm³ (bulk density: varies)
Vapor Pressure: Not relevant at normal conditions
Flash Point: Not flammable
Other Properties: Stable under recommended use, releases SO2 gas slowly in moist air
Stability: Stable in dry conditions
Hazardous Reactions: Reacts with acids to release toxic sulfur dioxide gas
Incompatibility: Avoid contact with acids, oxidizing agents, aluminum, and magnesium
Decomposition Products: Sulfur dioxide, sodium oxide
Conditions to Avoid: High humidity, contact with moisture and heat over 150°C
Acute Effects: May irritate skin, eyes, and mucous membranes, inhalation of dust may provoke respiratory discomfort
Chronic Effects: Asthma-like symptoms can appear in sensitized individuals, some cases of allergy have been reported
LD50 (Oral, rats): Approximately 2,610 mg/kg
Carcinogenicity: Not classified as carcinogenic by IARC, NTP, or OSHA
Other Data: Symptoms in overexposure: wheezing, chest tightness, headache, nausea
Environmental Fate: Rapidly oxidized to sulfate by natural processes, low potential for bioconcentration
Aquatic Toxicity: Harmful to aquatic organisms at high concentrations, LC50 (rainbow trout) about 220 mg/L (96h)
Soil Mobility: Highly soluble, leaches in wet environments
Persistence and Degradability: Does not persist; breaks down in water and soil to nontoxic sulfate
Other Concerns: Can reduce dissolved oxygen in water, leading to fish kill in poorly buffered systems
Waste Disposal Method: Place material in appropriate waste container, neutralize with diluted acid under fume hood if required, send to licensed chemical disposal facility
Container Disposal: Rinse empty containers with water before recycling or discarding as permitted by regulations
Environmental Precautions: Prevent large quantities from contaminating soil and natural waters, follow local, state, and federal guidelines
UN Number: Not regulated for ground or air transport under most systems
Shipping Name: Sodium sulfite
Transport Hazard Class: Non-hazardous (general cargo)
Packing Group: None required
Special Precautions: Keep containers sealed and upright during transit, avoid excess moisture, clearly label all shipping units
OSHA Status: Not specifically listed as hazardous, but considered a nuisance dust
SARA Title III: No components are subject to emergency planning notification
TSCA: Listed in the Toxic Substances Control Act inventory
DSL (Canada): Listed
Food Additive Regulations: Approved for specific food uses by FDA, restrictions apply
Other Local and National Regulations: Comply with requirements for safe handling and reporting of quantities as appropriate
