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Product Name: Sodium Metabisulfite
Chemical Formula: Na2S2O5
Common Synonyms: Disodium disulfite, Sodium pyrosulfite
CAS Number: 7681-57-4
Recommended Use: Food preservative, water treatment, industrial chemical
Manufacturer: Contact details on commercial packaging or local distributor
Emergency Contact: Access local poison control or the emergency line listed on the label
GHS Classification: Acute toxicity (Oral) Category 4, Skin irritation Category 2, Eye irritation Category 2A
Pictograms: Exclamation mark
Signal Word: Warning
Hazard Statements: Harmful if swallowed, causes skin irritation, causes serious eye irritation, may cause allergic respiratory reaction in sensitive persons
Potential Health Effects: Asthma-like symptoms, skin rash, eye damage, gastrointestinal upset
Target Organs: Lungs, skin, eyes
Chemical Name: Sodium metabisulfite
Concentration: 98–100%
Impurities: Trace amounts of sodium sulfate, sodium sulfite
Molecular Weight: 190.1 g/mol
Inhalation: Move to fresh air, loosen clothing, seek medical attention for difficulty breathing or asthma symptoms
Skin Contact: Rinse with water for several minutes, remove contaminated clothing, use soap, seek medical help if irritation persists
Eye Contact: Rinse cautiously with water for at least 15 minutes, remove contact lenses, seek immediate medical assistance
Ingestion: Do not induce vomiting, rinse mouth with water, call poison control or doctor right away
Suitable Extinguishing Media: Use water spray, dry chemical, foam, or carbon dioxide
Hazards from Combustion: Produces toxic gases such as sulfur oxides and sodium oxide in a fire
Protective Equipment: Firefighters use self-contained breathing apparatus and full protective clothing
Special Procedures: Fight fire from a safe distance, avoid inhaling fumes, cool containers with water spray to prevent rupture
Personal Precautions: Wear chemical-resistant gloves, goggles, protective clothing, and if necessary, a respirator
Spill Cleanup: Ventilate area, sweep up material carefully to reduce dust, place in appropriate container for disposal, avoid water entering spill area
Environmental Precautions: Do not let product enter watercourses or drains, prevent spread using sand or inert absorbent
Decontamination: Smaller spills can be cleaned with water after removal of bulk solid, use sulfite-neutralizing agents if available
Handling: Use only in well-ventilated areas, avoid dust creation, handle with clean, dry tools, avoid contact with acids as toxic sulfur dioxide gas can form
Storage Temperature: Store at room temperature, keep tightly sealed in original container
Storage Conditions: Protect from moisture and light, keep away from incompatible substances like acids, oxidizers, and reducing agents
Special Instructions: Clearly label containers, keep out of reach of children, ensure emergency eyewash stations and showers are close by
Exposure Limits: OSHA PEL: 5 mg/m3 (TWA), ACGIH TLV: 5 mg/m3 (TWA)
Engineering Controls: Good local ventilation, closed systems where possible, dust extraction recommended
Personal Protective Equipment (PPE): Chemical-resistant gloves, splash goggles or face shield, long-sleeved clothing, NIOSH/MSHA approved respirator if dust is generated or limits exceeded
Hygiene Measures: Wash hands after handling, do not eat, drink or smoke near the chemical, launder contaminated clothing before reuse
Appearance: White to off-white crystalline powder
Odor: Slight sulfurous smell
Melting Point: Decomposes above 150°C
Solubility: Easily soluble in water
pH (solution): 4.0–4.6 (5% solution)
Vapor Pressure: Not applicable
Boiling Point: Not applicable (decomposes before boiling)
Density: 1.48 g/cm3
Other Properties: Non-flammable, changes color if exposed to air or moisture
Chemical Stability: Stable under dry, cool conditions in closed containers
Reactivity: Reacts with acids to release sulfur dioxide gas
Incompatible Materials: Strong acids, oxidizing agents like chlorine; contact generates heat and toxic gases
Hazardous Decomposition Products: Sulfur dioxide, sodium oxide
Polymerization: Will not polymerize
Likely Routes of Exposure: Inhalation, ingestion, skin contact, eye contact
Acute Effects: Harmful if swallowed, causes respiratory, skin, and eye irritation, may trigger asthma attacks
Chronic Effects: Prolonged exposure can cause chronic respiratory distress, sensitization in asthmatic individuals
LD50 (oral, rat): Approximately 1132 mg/kg
Carcinogenicity: Not classified as a carcinogen by NTP, IARC or OSHA
Irritation Data: Strong irritant to eyes and skin, especially if contact is prolonged
Allergic Reactions: May provoke asthmatic or allergic reactions in susceptible individuals
Ecotoxicity: Toxic to aquatic life in high concentrations, forms acidic compounds in water harmful to fish and aquatic organisms
Persistence: Breaks down in water and soil, forming sulfite and sulfate ions
Bioaccumulation: Does not bioaccumulate in organisms
Mobility: High solubility in water allows it to move freely if released
Environmental Fate: Converts rapidly to other sulfur compounds under environmental conditions
Waste Management: Dispose of contents in accordance with local, regional, and national regulations
Waste Characterization: Not a listed hazardous waste in most regions, but chemical should not be dumped in sewers or waterways
Container Disposal: Triple rinse empty containers and dispose of as hazardous material
Best Practices: Use waste minimization procedures, avoid generating dust, coordinate with licensed hazardous waste handler
UN Number: UN 3077
Proper Shipping Name: Environmentally hazardous substance, solid, n.o.s. (contains sodium metabisulfite)
Hazard Class: 9 (Miscellaneous dangerous substances)
Packing Group: III
Labeling Requirements: Marked as hazardous to the environment for international shipments
Special Precautions: Avoid moisture, separate from food and feed products during shipping, ensure container integrity
Workplace Safety: Listed by US OSHA, European ECHA, and other regulatory bodies as a hazardous substance
SARA 302/313 Status: Not regulated as an extremely hazardous substance, but included on some hazardous chemical lists
TSCA Status: Listed
EU Regulation: Covered under REACH, CLP, and former Dangerous Substances Directive
Labeling Obligations: Hazard pictograms, signal word, hazard statements, precautionary statements as outlined by GHS
Additional Information: Some uses (e.g., food, water treatment) come with specific restrictions or reporting requirements under national or regional law
West Ujimqin Banner, Xilingol League, Inner Mongolia, China
