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SODIUM THIOSULFATE
ICSC: 1138
Peer-Review Status: 04.06.2006 Validated
Disodium thiosulfate
Thiosulfuric acid, disodium salt
Sodium hyposulfit 
CAS #: 7772-98-7 RTECS #: XN6476000
EINECS #: 231-867-5
    Formula: Na2O3S2
Molecular mass: 158.1

TYPES OF
HAZARD /
EXPOSURE
ACUTE HAZARDS / SYMPTOMS      PREVENTION      FIRST AID / FIRE FIGHTING
FIRE Not combustible. Gives off irritating or toxic fumes (or gases) in a fire.  NO contact with oxidizing agents.  In case of fire in the surroundings, use appropriate extinguishing media. 
EXPLOSION Risk of explosion on contact with oxidizing agents.     
 
EXPOSURE      
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
PACKAGING & LABELLING
Personal protection: particulate filter respirator adapted to the airborne concentration of the substance. Sweep spilled substance into covered containers.   
EC Classification
 
UN Classification
 
GHS Classification
 

EMERGENCY RESPONSE SAFE STORAGE
  Separated from strong oxidants. 

IMPORTANT DATA
Physical State; Appearance
COLOURLESS CRYSTALS. 

Physical dangers
 

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

Occupational exposure limits
TLV (NOT-ESTABLISHED):. 

Routes of exposure
 

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

Effects of short-term exposure
 

Effects of long-term or repeated exposure
 


PHYSICAL PROPERTIES ENVIRONMENTAL DATA
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) 
 

NOTES
 

ADDITIONAL INFORMATION
 

IPCS
International
Programme on
Chemical Safety
WHO ILO EC Prepared in the context of cooperation between the International Programme on Chemical Safety and the European Commission
© IPCS 2004-2012
LEGAL NOTICE Neither the EC nor the IPCS nor any person acting on behalf of the EC or the IPCS is responsible for the use which might be made of this information.


    See Also:
       Toxicological Abbreviations
       SODIUM THIOSULFATE (JECFA Evaluation)