Please see this article from Wikipedia:

http://en.wikipedia.org/wiki/Disulfur_decafluoride

This molecule is formed by electrical decomposition of SF6, having toxicity similar than phosgene, but IS NOT phosgene.

Maybe this article answers your question:

V. Malatesta, P. A. Hackett, C. Willis, J. Chem. Soc., Chem. Commun., 1981, 247-248.

DOI: 10.1039/C39810000247

Generally, SF6 is not reactive at all! Harsh conditions should be required for its conversion with CO2 (air?) to give fluoro phosgene (F2C=O) and sulfuryl fluoride (SO2F2). The authors used a laser irradiation procedure.

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In order to answer this question, one should know the experimental conditions. Is it a photochemical or a thermal system? Besides, in the absence of chlorine, only fluorphosgene could eventually be produced.

In my investigation on SF6 decomposition products by high current arc, in the Institute of Electical Research , in Mexico, I found that Depending on the present quantity of water the COF2 forms within a hermetically closed teflon vessel, containing SF6 and two tungsten electrodes, using differents distances in the separation, also were measured, S2F10,SF4, SF2, WF4, WF6, S2F2.