Sulfur mustard

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Victim with mustard gas burns, in World War I
Sulfur mustard (HD)
Sulfur Mustard

Sulfur Mustard

General
Systematic name Bis (2-chloroethyl) sulfide
Other names Iprit
Kampfstoff "Lost"
Lost
Mustard gas
Senfgas
Yellow Cross Liquid
Yperite
Molecular formula C4H8Cl2S
Molar mass 159 g/mol
Appearance Colorless if pure.
Normally ranges from
pale yellow to dark brown.
Slight garlic type odor.
CAS numbers [505-60-2]
[39472-40-7]
[68157-62-0]
Properties
Density and phase 1.27 g/ml, liquid
Solubility in water Negligible
Melting point 14.4 °C
Boiling point 217 °C (decomposes)
Vapor pressure 0.11 mmHg @ 25 °C
Hazards
MSDS External MSDS
Main hazards Vesicant
NFPA 704

NFPA 704.svg

1
4
1
 
0.003 mg/m3
Flash point 105 °C
Related compounds
Related compounds Nitrogen mustard
Except where noted otherwise, data are given for
materials in their standard state (at 25 °C, 100 kPa)
Infobox disclaimer and references

Sulfur mustard is a chemical compound. It can be used for chemical warfare. Most sulfur mustards are squishy liquids with no color and no smell when they are at room temperature. When used in warfare, they have a color yellowish to brown. Some of them smell like culinary mustard (the type used for food), horseradish or garlic. They got their name from the smell, but are completely unrelated to culinary mustard.

Sulfur mustard (in its form mustard gas) was synthesized by Frederick Guthrie in 1860. It may have been discovered as early as the 1820s, by M.Depretz.

Its use during warfare was prohibited by the Geneva Protocol of 1925. This protocol outlawed the use of poison gas (which was widely used in the First World War). An additional agreement, the Chemical Weapons Convention, was ratified in 1993. It also outlaws the production and stockpiling of such agents.