PFA is produced by copolymerization of perfluoroethers and hexafluoropropylene (the monomer used to produce PTFE). The main difference in its structure is that some carbon atoms are linked to a fluoroether group, with an oxygen atom, and not just carbon-fluorines bonds.
Properties of PFA are very similar to PTFE or FEP. The thermal stability is close to PTFE: PFA has a melting point, at 305°C, lower than PTFE while still allowing for a large range of applications. PFA also exhibits low friction.
Just like FEP, PFA is injection moldable and can be directly extruded. This effectively gives more versatility in designing PFA parts.
PFA tubes are generally more flexible than PTFE tubes, but don’t reach their flexlife. Compared to FEP, PFA offers globally better mechanical properties at high operating temperatures.
The production of PFA polymer and its transformation are well-known for their low contamination level. Therefore, PFA is often preferred to other fluoropolymers in high purity applications, like the semi-conductor industry or pharmaceutical production.