PCTFE GASKETS / SEALS
PCTFE is a harder and stronger polymer, with better mechanical properties than PTFE. Originally known as KEL-F, the name is still used now.
Although not well known, PCTFE (Polychlorotrifluoroethylene) forms an ideal substitute for PTFE in certain applications where PTFE is unable to perform adequately.
Marginally higher tensile strength, PCTFE rates higher than PTFE on this metric.
PCTFE is stiffer than PTFE, which means it lacks some of the softness of PTFE when it comes to sealing, but that it also holds its dimensions more easily.
PCTFE is more expensive than PTFE, and is therefore used in specific applications only.