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SODIUM THIOSULFATEICSC: 1138
June 2006
CAS #: 7772-98-7Disodium thiosulfate
Thiosulfuric acid, disodium salt
Sodium hyposulfit
EINECS #: 231-867-5

  ACUTE HAZARDS PREVENTION FIRE FIGHTING
FIRE & EXPLOSION Not combustible. Gives off irritating or toxic fumes (or gases) in a fire.  Risk of explosion on contact with oxidizing agents.  NO contact with oxidizing agents.    In case of fire in the surroundings, use appropriate extinguishing media.   

   
  SYMPTOMS ACUTE HAZARDS FIRST AID
Inhalation   Avoid inhalation of dust.  Fresh air, rest. 
Skin     Rinse and then wash skin with water and soap. 
Eyes Redness.  Wear safety goggles.  Rinse with plenty of water for several minutes (remove contact lenses if easily possible). 
Ingestion   Do not eat, drink, or smoke during work.  Rinse mouth. 

SPILLAGE DISPOSAL CLASSIFICATION & LABELLING
Personal protection: particulate filter respirator adapted to the airborne concentration of the substance. Sweep spilled substance into covered containers. 

According to UN GHS Criteria

 

Transportation
UN Classification
 

STORAGE
Separated from strong oxidants. 
PACKAGING
 
SODIUM THIOSULFATE ICSC: 1138
PHYSICAL & CHEMICAL INFORMATION

Physical State; Appearance
COLOURLESS CRYSTALS. 

Physical dangers
 

Chemical dangers
Decomposes on heating. This produces toxic fumes including sulfur oxides. Reacts violently with strong oxidants. 

Formula: Na2O3S2
Molecular mass: 158.1
Decomposes at 300°C
Melting point: 48.5°C
Density: 1.7 g/cm³
Solubility in water, g/100ml at 20°C: 20.9
Vapour pressure at 20°C: negligible
Octanol/water partition coefficient as log Pow: -4.35 (calculated) 


EXPOSURE & HEALTH EFFECTS

Routes of exposure
 

Effects of short-term exposure
 

Inhalation risk
A nuisance-causing concentration of airborne particles can be reached quickly when dispersed. 

Effects of long-term or repeated exposure
 


Occupational exposure limits
 

ENVIRONMENT
 

NOTES
 

ADDITIONAL INFORMATION
  EC Classification
 

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    See Also:
       Toxicological Abbreviations
       SODIUM THIOSULFATE (JECFA Evaluation)