Carbonyl sulfide

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A highly toxic colorless gas with a sulfide odor. Carbonyl sulfide is formed during production of carbon disulfide and the manufacture of some plastics. Significant amounts of carbonyl sulfide are also released during the combustion of coal, fossil fuels, natural gas, biomass, and refuse. Non-human activity production of carbonyl sulfide comes from volcanos, salt marshes, and soils. It is naturally removed from the atmosphere by plants, photolysis, soil absorption, water hydrolysis, and microorganisms.

Synonyms and Related Terms



  • Flammable. 
  • May be ignited by sparks.  Forms explosive mixtures in air. 
  • Decomposes to form carbon monoxide.
  • Carbonyl sulfide: MSDS

Physical and Chemical Properties

Composition COS
CAS 463-58-1
Melting Point -138.8 C
Molecular Weight 60.07
Boiling Point -50.2 C

Resources and Citations