Join Date: Oct 2004
Location: Peters Creek, Alaska
To confirm what others have supposed, PTFE is the material known as Teflon (as is Goretex, BTW). Various manufacturers' literature state that it is chemically inert, insoluable in all known solvents, has excellent resistance to inorganic and organic acids, is attacked only by molten alkali metals and by fluorine at high temperatures, etc. So, I don't think CO2 is likely to break it down...but then, I'm no chemist.
FWIW, when I set up my CO2 system, I had no thread compound on hand but I did have a role of teflon tape made for gas applications. It's much thicker than standard teflon tape, so I supposed that it's less likely to shred. To hedge that bet, I applied it behind the first thread with the idea of keeping it as far out of the path of gas flow as is practical. If/when I have to break the setup down, I'll check the tape's condition.