PTFE is inert to essentially all common chemicals. It is attacked by molten alkali metals, elemental fluorine, and pure oxygen at elevated temperatures. PTFE can also react, under some conditions, with alkaline earth oxides and finely divided metals such as aluminum or magnesium at elevated temperature. Absorption of solvents is noted with some chlorinated and fluorinated liquids containing no hydrogen. Solutions containing 0.1 – 2% PTFE have been obtained in perfluorokerosene in the temperature range 290 – 310 deg C.
Exposure to the following chemicals has been found to have no effect on PTFE:
The chemical resistance of ECTFE is not as universal as PTFE, FEP or PFA, MFA. It is susceptible to attack by some organic chemicals such as diacetone alcohol, acetone, benzene, liquid bromine, butyl acetate, chlorobenzene and chlorosulfonic acid above certain temperatures. ECTFE is compatible with a range of chemicals, however chemical compatibility must be verified before use or specification for an application. No known solvent causes stress cracking in ECTFE at temperatures up to 250 deg F (120 deg C).