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Product Name: Sodium Metabisulphite
Chemical Formula: Na2S2O5
Synonyms: Disodium disulphite, Sodium pyrosulphite
CAS Number: 7681-57-4
EC Number: 231-673-0
Recommended Use: Preservative, antioxidant, disinfectant, bleaching agent, water treatment
Supplier Details: Manufacturer or distributor contact details should appear here as per regulations, including address, phone number, and emergency phone number
Emergency Contact: Local poison control center or chemical emergency response center contact numbers
Classification: Skin irritation (Category 2), Eye irritation (Category 2A), Respiratory sensitizer (Category 1)
Hazard Statements: Causes skin and eye irritation, may cause allergic respiratory reaction, harmful if swallowed
Pictograms: Exclamation mark, health hazard
Signal Word: Warning
Precautionary Statements: Avoid breathing dust, wash thoroughly after handling, wear protective gloves/eye protection/face protection, use only outdoors or in a well-ventilated area
Other Hazards: Contact with acids releases toxic sulfur dioxide fumes; dust can cause asthmatic symptoms in sensitive individuals
Chemical Name: Sodium Metabisulphite
Concentration: 98-100%
CAS Number: 7681-57-4
Impurities: Contains traces of sodium bisulphite and sodium sulphate
Molecular Weight: 190.1 g/mol
Relevant impurities: Not classified as hazardous above reporting thresholds; quality and purity may slightly vary by supplier
Inhalation: Move person to fresh air out of risk area, keep at rest in a position comfortable for breathing, seek immediate medical attention for breathing problems or persistent cough
Skin Contact: Remove contaminated clothing, flush skin with plenty of water and mild soap, continue rinsing for at least 15 minutes, get medical advice if irritation persists
Eye Contact: Immediately rinse eyes with plenty of water, lifting upper and lower lids, continue flushing for at least 15 minutes, obtain prompt medical attention
Ingestion: Do not induce vomiting, rinse mouth with water, seek medical attention immediately, give nothing by mouth to unconscious person
Notes to Physician: Treat symptomatically, monitor for respiratory distress, treat asthmatic symptoms with appropriate bronchodilators
Suitable Extinguishing Media: Use water spray, dry chemical, foam, or carbon dioxide; water preferred for larger fires
Unsuitable Media: Direct water stream may spread dusty materials
Special Hazards: Thermal decomposition releases toxic and irritating gases including sulfur dioxide; dusts may form explosive mixtures with air
Protective Equipment: Self-contained breathing apparatus and full protective clothing required for fire-fighters
Firefighting Instructions: Evacuate surrounding area, use water spray to cool containers, avoid inhalation of combustion products, approach upwind
Personal Precautions: Evacuate unnecessary personnel; ensure adequate ventilation; avoid breathing dust and fumes; wear appropriate personal protective equipment such as gloves, safety goggles, and dust respirators
Environmental Precautions: Prevent leakage or spillage from entering drains, surface and ground waters, soil
Methods for Cleaning Up: Sweep up and shovel spilled material; avoid raising dust; collect in suitable, labeled containers for disposal; ventilate area thoroughly; clean spill site with water after removal of material
Emergency Procedures: Notify relevant authorities if spill reaches watercourse or environmental hazard occurs
Handling: Avoid breathing dust or fumes, avoid contact with skin or eyes, use only with adequate chemical-resistant gloves and goggles, wash hands thoroughly after handling, do not eat, drink, or smoke while using material
Safe Handling Advice: Open containers carefully to prevent sudden dust release, control dust formation at all points, avoid generation of airborne particulates
Storage Conditions: Store in cool, dry, well-ventilated area, away from direct sunlight, heat sources, and incompatible materials such as acids and oxidizers; keep container tightly closed and properly labeled
Incompatibilities: Strong acids, oxidizing agents, moisture; avoid storing near foods or animal feeds
Engineering Controls: Local and general ventilation must control airborne dust levels, process enclosures or extractors advised in handling areas
Occupational Exposure Limits: OSHA TWA 5 mg/m3 (as respirable dust, sodium metabisulphite), ACGIH TWA 5 mg/m3 (as SO2 generated)
Personal Protective Equipment: Chemical-resistant gloves (e.g., nitrile), tightly-fitted safety goggles or face shields, lab coat or protective clothing, dust mask or NIOSH-approved respirator if airborne concentrations exceed exposure limits
Hygiene Measures: Wash hands and face after handling, change contaminated clothing, do not carry contaminated work clothing offsite
Appearance: White or colorless crystalline powder or granules
Odor: Slight sulfurous odor
Odor Threshold: Detectable at low concentrations (sulfur dioxide smell)
pH (1% solution): 4.0-5.0
Melting Point/Freezing Point: Decomposes at 150°C; does not have a true melting point
Boiling Point: Not applicable
Flash Point: Non-flammable
Evaporation Rate: Not applicable
Flammability (Solid, Gas): Not flammable, but dust may pose explosion risk
Vapor Pressure: Not applicable
Vapor Density: Not applicable
Relative Density: 1.48 g/cm3
Solubility: Soluble in water (650 g/L at 20°C)
Partition Coefficient (n-octanol/water): Not available
Auto-ignition Temperature: Not self-igniting
Decomposition Temperature: 150°C
Viscosity: Not applicable
Chemical Stability: Stable under recommended storage conditions and temperatures, avoids prolonged exposure to air and moisture
Reactive Conditions: Heat, moisture, contact with acids
Incompatible Materials: Acids (releases sulfur dioxide gas), oxidizers (may cause violent reactions), moisture (decomposes product and releases SO2)
Hazardous Decomposition Products: Sulfur oxides (mainly sulfur dioxide)
Hazardous Reactions: Exothermic reaction with acids, releases toxic fumes
Acute Toxicity: Low oral toxicity, but ingestion may cause irritation of digestive tract, nausea, vomiting, diarrhea, and in sensitive individuals, possible allergic reactions
Inhalation: Breathing dust can cause irritation to nose, throat, and lungs, may trigger asthma-like reactions and respiratory distress, particularly in individuals with asthma or allergies
Skin Contact: Can cause redness, itching, and irritation
Eye Contact: Causes pain, redness, watering, and potential temporary vision impairment
Chronic Exposure: Prolonged contact may cause skin sensitization, repeated inhalation may aggravate respiratory conditions
Carcinogenicity: Not classified as carcinogenic by IARC, ACGIH, NTP, or OSHA
Mutagenicity and Reproductive Toxicity: Not reported under normal handling
Aquatic Toxicity: Harmful to aquatic life with short-term effects, especially to invertebrates and fish due to potential to lower oxygen in water
Persistence and Degradability: Readily degrades in water to harmless compounds, SO2 released can acidify aquatic environments
Bioaccumulative Potential: Does not significant accumulate in organisms
Mobility in Soil: Dissolves and disperses easily in soil and groundwater
Other Adverse Effects: Avoid large releases to surface water due to risk of pH shifts and temporary oxygen depletion harming local organisms
Disposal Methods: Dispose of in accordance with local, regional, and national regulations; do not allow into drains, water courses, or soil
Waste Treatment: Neutralize using dilute alkali, dilute sulfur dioxide produced, or consult chemical waste specialist
Container Disposal: Empty containers may retain residue; rinse thoroughly before recycling or discarding per approved disposal practices, do not reuse contaminated containers
UN Number: 3077
UN Proper Shipping Name: Environmentally Hazardous Substance, Solid, N.O.S. (contains sodium metabisulphite)
Transport Hazard Class: 9
Packing Group: III
Labeling: Environment hazard symbol required for international transport; ensure all containers clearly marked
Marine Pollutant: Not considered a marine pollutant according to current regulations
Special Precautions: Keep away from incompatible materials, temperature extremes, humidity during transit
OSHA: Covered under toxic and hazardous substances standard
TSCA (US): Listed in TSCA inventory
EINECS/ELINCS (EU): Listed
REACH: Complies with requirements for registration, evaluation, authorization, restriction of chemicals
WHMIS (Canada): Classified as hazardous—check current specifications
Labeling Requirements: Must include standard hazard statements and pictograms; keep SDS available in the workplace
Other Regulations: Subject to transport, environmental, food contact, and workplace safety controls in various jurisdictions; users should confirm applicable state and local requirements to avoid compliance issues
West Ujimqin Banner, Xilingol League, Inner Mongolia, China
