[Freon decomposition products include phosgene] Well, it's a tangled mess. There are many different chemicals which have been sold under the Freon name. Mr. Brown may have confused any of these with Halon, another large family of fluorocarbons which *have* been used for fire suppression, including data centers. They all seem to be on the way out, due to the ozone-depleting properties of halogens in the upper atmosphere. I haven't examined all of the Halons, but I don't recall seeing any chlorinated ones, and without chlorine you can't make phosgene.
I'd sometimes wondered about the phosgene link, and finally looked it up. Its name has got nothing to do with phosphorus (which isn't used in any of these chemicals), but to the use of light to power the reaction in which it was first synthesized. So says Wikipedia, anyway. -- Mark H. Wood, Lead System Programmer [email protected] Friends don't let friends publish revisable-form documents.
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