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Sodium metabisulfite
CAS No.: 7681-57-4
Formula: Na2O5S2
Exact Mass: 189.89800
Molecular Weight: 190.10700
PSA: 124.92000
LogP: 0.27220
Reference Price: $274/ton Inquiry Now
Sodium metabisulfite 7681-57-4 MSDS

Section 1. Chemical Product and Company Identification
    Sodium metabisulfite
    Common Name/
    Trade Name
    Commercial Name(s)
    Chemical Name
    Chemical Family
    Sodium metabisulfite

Section 4. First Aid Measures
    Eye Contact        Check for and remove any contact lenses. In case of contact, immediately flush eyes with plenty of water for    
    at least 15 minutes. Cold water may be used. Get medical attention immediately.
    Skin Contact        In case of contact, immediately flush skin with plenty of water. Cover the irritated skin with an emollient.    
    Remove contaminated clothing and shoes. Cold water may be used.Wash clothing before reuse. Thoroughly
    clean shoes before reuse. Get medical attention.
    Serious Skin Contact        Wash with a disinfectant soap and cover the contaminated skin with an anti-bacterial cream. Seek immediate    
    medical attention.
    Inhalation        If inhaled, remove to fresh air. If not breathing, give artificial respiration. If breathing is difficult, give oxygen.    
    Get medical attention.
    Serious Inhalation        Not available.    
    Ingestion        Do NOT induce vomiting unless directed to do so by medical personnel. Never give anything by mouth to an    
    unconscious person. If large quantities of this material are swallowed, call a physician immediately. Loosen
    tight clothing such as a collar, tie, belt or waistband.
    Serious Ingestion        Not available.    

Section 5. Fire and Explosion Data
    Flammability of the Product Non-flammable.
    Auto-Ignition Temperature Not applicable.
    Flash Points        Not applicable.    
    Flammable Limits        Not applicable.    
    Products of Combustion        Not available.    
    Fire Hazards in Presence of Not applicable.
    Various Substances
    Explosion Hazards in Presence Risks of explosion of the product in presence of mechanical impact: Not available.
    of Various Substances        Risks of explosion of the product in presence of static discharge: Not available.    
    Fire Fighting Media        Not applicable.    
    and Instructions
    Special Remarks on        When heated to decomposition it emits toxic fumes of SOx, Na2O.    
    Fire Hazards        Decomposes on heating to form sodium sulfate    
    Special Remarks on Explosion Not available.

Section 6. Accidental Release Measures
    Small Spill        Use appropriate tools to put the spilled solid in a convenient waste disposal container. Finish cleaning by    
    spreading water on the contaminated surface and dispose of according to local and regional authority
    Large Spill        Use a shovel to put the material into a convenient waste disposal container. Finish cleaning by spreading    
    water on the contaminated surface and allow to evacuate through the sanitary system. Be careful that the
    product is not present at a concentration level above TLV. Check TLV on the MSDS and with local
    Sodium metabisulfite

Section 7. Handling and Storage
    Precautions        Do not ingest. Do not breathe dust. Avoid contact with skin. Wear suitable protective clothing. In case of    
    insufficient ventilation, wear suitable respiratory equipment. If ingested, seek medical advice immediately and
    show the container or the label. Keep away from incompatibles such as oxidizing agents, acids.
    Storage        Keep container tightly closed. Keep container in a cool, well-ventilated area. Moisture sensitive. Air    

Section 8. Exposure Controls/Personal Protection
    Engineering Controls        Use process enclosures, local exhaust ventilation, or other engineering controls to keep airborne levels below    
    recommended exposure limits. If user operations generate dust, fume or mist, use ventilation to keep
    exposure to airborne contaminants below the exposure limit.
    Personal Protection        Safety glasses. Lab coat. Dust respirator. Be sure to use an approved/certified respirator or equivalent.    
    Personal Protection in Case of Splash goggles. Full suit. Dust respirator. Boots. Gloves. A self contained breathing apparatus should be
    a Large Spill        used to avoid inhalation of the product. Suggested protective clothing might not be sufficient; consult a    
    specialist BEFORE handling this product.
    Exposure Limits        TWA: 5 (mg/m3) from OSHA (PEL) [United Kingdom (UK)]    
    TWA: 5 (mg/m3) from ACGIH (TLV) [United States]
    TWA: 5 (mg/m3) from NIOSH [United States]
    TWA: 5 (mg/m3) [United Kingdom (UK)]
    Consult local authorities for acceptable exposure limits.

Section 9. Physical and Chemical Properties
    Solid. (Crystals solid or Powdered solid. Odor        odor of sulfur dioxide    
    Physical state and appearance
    Granular solid.)
    Taste        Not available.    
    Molecular Weight        190.13 g/mole    
    Color        White to yellowish.    
    pH (1% soln/water)        4.3 [Acidic.]    
    Not available.
    Boiling Point
    Melting Point        Decomposition temperature: 150°C (302°F)    
    Critical Temperature        Not available.    
    Specific Gravity        1.4 - 1.48 (Water = 1)    
    Vapor Pressure        0 mm Hg. It is a solid that doesn't emit any vapors.    
    Vapor Density        Not available.    
    Volatility        Not available.    
    Not available.
    Odor Threshold
    Water/Oil Dist. Coeff.        Not available.    
    Ionicity (in Water)        Not available.    
    Dispersion Properties        See solubility in water.    
    Solubility        Easily soluble in cold water, hot water.    
    Freely soluble in glycerol.
    Slightly soluble in alcohol.
    Moderately soluble in ethanol.
    Solubility in Water: 54 g/100 ml water @ 20 deg. C; 81.7 g/100 ml water @ 100 deg. C..
    Sodium metabisulfite

Section 10. Stability and Reactivity Data
    The product is stable.
    Instability Temperature        Not available.    
    Conditions of Instability        Incompatible materials, heat, moisture, air, dust generation.    
    Incompatibility with various        Reactive with oxidizing agents, acids.    
    Non-corrosive in presence of glass.
    Special Remarks on        Moisture sensitive Air sensitive.    
    Reactivity        It slowly oxidizes to sodium sulfate upon exposure to air and moisture.    
    Incompatible with sodium nitrite
    Not available.
    Special Remarks on
    Polymerization        Will not occur.    

Section 11. Toxicological Information
    Routes of Entry        Inhalation. Ingestion.    
    Toxicity to Animals        Acute oral toxicity (LD50): 1131 mg/kg [Rat].    
    Acute dermal toxicity (LD50): >1000 mg/kg [Guinea pig].
    Chronic Effects on Humans        CARCINOGENIC EFFECTS: 3 (Not classifiable for human.) by IARC.    
    MUTAGENIC EFFECTS: Mutagenic for bacteria and/or yeast.
    May cause damage to the following organs: upper respiratory tract, skin, eyes.
    Other Toxic Effects on        Slightly hazardous in case of skin contact (irritant), of ingestion, of inhalation.    
    Special Remarks on        Not available.    
    Toxicity to Animals
    Special Remarks on
    May affect genetic material (mutagenic) based on animal test data.
    Chronic Effects on Humans        May cause adverse reproductive effects based on animal test data.    
    Special Remarks on other        Acute Potential Health Effects:    
    Toxic Effects on Humans        Skin: May cause skin irritation.    
    Eyes: May cause eye irritaiton.
    Inhalation: May cause respiratory tract irritation with coughing and wheezing.
    Ingestion: May be harmful if swallowed. May cause gastrointestinal tract irritation by liberation of Sulfurous
    acid. Symptoms may include abdominal pain, nausea, vomiting, diarrhea, violent colic, and possible gastric
    hemorrhaging. May affect behavior/central nervous system and cause central nervous system
    depression/seizures. It may also affect the cardiovasular system (hypotension, tachycardia, cardiovascular
    collapse). Ingestion of sulfite compounds may cause a severe allergic reaction (anaphylactoid symptoms) in
    sensitive individuals and some asthmatics.
    Chronic Potential Health Effects:
    Skin: Prolonged or repeated skin contact may cause allergic dermatitis.
    Ingestion: Prolonged or repeated ingestion may cause anorexia, and affect the liver, urinary system, and
    metabolism (weight loss).
    Inhalation: Prolonged or repeated inhalation may irritate the lungs, may cause bronchitis to develop with
    cough, phlegm and/or shortness of breath.
    Future exposures may also cause asthma like allergy with coughing, shortness of breath, wheezing and/or
    chest tightness.

Section 12. Ecological Information
    Ecotoxicity        Not available.    
    BOD5 and COD        Not available.    
    Products of Biodegradation        Possibly hazardous short term degradation products are not likely. However, long term degradation products    
    may arise.
    Toxicity of the Products        The products of degradation are less toxic than the product itself.    
    of Biodegradation
    Sodium metabisulfite
    Special Remarks on the        Not available.    
    Products of Biodegradation

Section 13. Disposal Considerations
    Waste must be disposed of in accordance with federal, state and local environmental
    Waste Disposal
    control regulations.

Section 14. Transport Information
    DOT Classification        Not a DOT controlled material (United States).    
    Identification        Not applicable.    
    Special Provisions for        Not applicable.    
    DOT (Pictograms)

Section 15. Other Regulatory Information and Pictograms
    Federal and State        Connecticut hazardous material survey.: Sodium metabisulfite    
    Illinois toxic substances disclosure to employee act: Sodium metabisulfite
    Rhode Island RTK hazardous substances: Sodium metabisulfite
    Pennsylvania RTK: Sodium metabisulfite
    Minnesota: Sodium metabisulfite
    Massachusetts RTK: Sodium metabisulfite
    New Jersey: Sodium metabisulfite
    California Director's List of Hazardous Substances: Sodium metabisulfite
    TSCA 8(b) inventory: Sodium metabisulfite
    TSCA 4(a) ITC priority list: Sodium metabisulfite
    TSCA 8(a) PAIR: Sodium metabisulfite
    TSCA 8(d) H and S data reporting: Sodium metabisulfite: effective: 1/26/94; sunset: 6/30/98
    California        California prop. 65: This product contains the following ingredients for which the State of California has    
    found to cause cancer which would require a warning under the statute: No products were found.
    Proposition 65
    California prop. 65: This product contains the following ingredients for which the State of California has
    found to cause birth defects which would require a warning under the statute: No products were found.
    Other Regulations        OSHA: Hazardous by definition of Hazard Communication Standard (29 CFR 1910.1200).    
    EINECS: This product is on the European Inventory of Existing Commercial Chemical Substances (EINECS
    No. 231-673-0).
    Canada: Listed on Canadian Domestic Substance List (DSL).
    China: Listed on National Inventory.
    Japan: Listed on National Inventory (ENCS).
    Korea: Listed on National Inventory (KECI).
    Philippines: Listed on National Inventory (PICCS).
    Australia: Listed on AICS.
    WHMIS (Canada) Not controlled under WHMIS (Canada).
    Other Classifications
    DSCL (EEC)        R22- Harmful if swallowed.        S46- If swallowed, seek medical advice    
    R31- Contact with acids liberates        immediately and show this container or label.    
    toxic gas.
    Health Hazard
    HMIS (U.S.A.)        1 National Fire Protection    
    0 Flammability
    0 Association (U.S.A.)
    Fire Hazard
    1 0 Reactivity
    Specific hazard
    Personal Protection
    Sodium metabisulfite
    WHMIS (Canada)
    DSCL (Europe)
    TDG (Canada)
    ADR (Europe)
    Protective Equipment
    Lab coat.
    Dust respirator. Be sure to use an
    approved/certified respirator or
    equivalent. Wear appropriate
    respirator when ventilation is


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