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Cyclosarin or GF (Cyclohexyl methylphosphonofluoridate) is an extrememly toxic substance that is one of the world's most dangerous weapons of war. It the most obscure member of the G-series family of nerve agents, a group of chemical weapon discovered and synthesized by a German team, led by Dr. Gerhard Schrader, during or soon after World War II.
As a chemical weapon, it is classified as a weapon of mass destruction by the United Nations according to UN Resolution 687, and its production and stockpiling was outlawed by the Chemical Weapons Convention of 1993.
Cyclosarin was found by Polish soldiers in artillery shells after Operation: Iraqi Freedom.
Chemical Characteristics
Like its predecessor, sarin, cyclosarin is a liquid organophosphate nerve agent. Its physical characteristics are quite different from sarin, however.
At room temperature, cyclosarin is a colorless liquid whose odor has been variously described as sweet and musty, and resembling peaches or shellac. Unlike sarin, cyclosarin is persistent liquid, meaning that it has a low vapor pressure, and therefore evaporates relatively slowly: about 69 times slower than sarin and 20 times more slowly than water. Its military value is therefore much greater as a liquid chemical weapon.
Also unlike sarin, cyclosarin is flammable, with a flash point of 94°C (201 °F).
Historical Notes
From CBWInfo.com (http://www.cbwinfo.com/Chemical/Nerve/GF.shtml)
- Cyclosarin was probably first synthesized during World War II as part of the systematic study of organophosphates undertaken by the Germans after their potential military utility was identified. It was again looked at in the early 1950's by both the United States and Great Britain as they undertook a systematic study of potential nerve agents (some U.S. sources suggest that interest in GF was stimulated by work undertaken in "another country"). However, the higher cost of the precursors for GF relative to those for GB along with its lower toxicity prevented it from being chosen for manufacture.
- Iraq is the only country in which large amounts of cyclosarin have ever been produced for use as a chemical warfare agent. As with most issues surrounding the Iraqi chemical weapons programs, the basis for their decision to produce GF is somewhat unclear. However, it seems likely that the choice was driven by a combination of a desire for a more persistent agent combined with problems with obtaining alcohol precursors for sarin (due to an embargo).
- As noted above, Iraq also fielded weapons filled with mixtures of sarin and cyclosarin. These mixtures appear to have been produced in part for purposes of increasing persistence and in part because of raw material issues.
Miscellaneous Facts
Binary weapons
Iraq developed a system in which GF (cyclosarin) is formed upon delivery, most likely mixing together methyphosphonyldifluoride with either cyclohexanol or a mixture of cyclohexylamine and cyclohexanol.
GB-GF Mixtures
According to CBWInfo.com (http://www.cbwinfo.com/Chemical/Nerve/GF.shtml), Iraq fielded munitions filled with a mixture of GB (sarin) and GF (cyclosarin). Tests on mice indicated that GB-GF mixtures have a relative toxicity between GF and GB.
References
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