Disodium thiosulfate
Thiosulfuric acid, disodium salt
Sodium hyposulfit
Na2O3S2
Molecular mass: 158.1
ICSC # 1138
CAS # 7772-98-7
RTECS # XN6476000
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Types of Hazard/ Exposure
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Acute Hazards/ Symptoms
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Prevention
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First Aid/
Fire Fighting
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FIRE
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Not combustible.
Gives off irritating or toxic fumes (or gases) in a fire.
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NO contact with
oxidants
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In case of fire in the surroundings: use appropriate extinguishing media.
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Explosion
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Risk of explosion
on contact with
oxidants
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Exposure
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•Inhalation
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Avoid inhalation of
dust
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Fresh air, rest.
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•Skin
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Rinse and then wash skin with water and soap.
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•Eyes
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Redness.
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Safety goggles
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First rinse with plenty of water (remove contact lenses if easily possible).
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•Ingestion
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Do not eat, drink, or smoke during work.
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Rinse mouth.
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Spillage Disposal
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Storage
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Packaging & Labelling
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Personal protection: P1 filter respirator for inert particles.
Sweep spilled substance into containers.
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Separated from
strong oxidants,
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Important Data
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Physical State; Appearance:
COLOURLESS CRYSTALS.
Physical Dangers:
Chemical Dangers:
The substance decomposes
on heating
producing toxic fumes,
including
sulfur oxides
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Reacts violently with strong oxidants.
Occupational Exposure Limits:
TLV not established.
MAK not established.
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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:
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Physical
Properties
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Decomposes below boiling point at 300°C
Melting point: 48.5°C
Density: 1.7
g/cm3
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Solubility in water, g/100 ml at 20°C: 20.9
Vapour pressure, Pa at 20°C: negligible
Octanol/water partition coefficient as log Pow: -4.35 (calculated)
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Environmental
Data
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N O T E S
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ADDITIONAL INFORMATION
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ICSC: 1138
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SODIUM THIOSULFATE
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(C) IPCS, CEC, 1994
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IMPORTANT LEGAL NOTICE:
Neither NIOSH, the CEC or the IPCS nor any person acting on behalf of NIOSH,
the CEC or the IPCS is responsible for the use which might be made of this
information. This card contains the collective views of the IPCS Peer Review Committee and may
not reflect in all cases all the detailed requirements included in national legislation
on the subject. The user should verify compliance of the cards with the relevant legislation
in the country of use.
The only modifications made to produce the U.S. version is inclusion of the OSHA PELs, NIOSH RELs and NIOSH IDLH values.
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