Melting point of Kel-F (PCTFE) seems to be about 212 C.
I think there are different kinds. Fleischmann said it was 300 deg C:
Wikipedia says 175 deg C:
The exact temperature does not matter. There is no way water would remain in the cell at any of the temperatures quoted. Ascoli65 has predicated his claim on grotesque nonsense. Anyone with an ounce of common sense will see it is nonsense. So what is the point of saying it? What is he trying to accomplish? Does he actually believe this??