Perfluoroalkoxy PFA

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Perfluoroalkoxy PFA, closely related to other fluoro polymers, is a clear co-polymer. It roughly combines the properties of PTFE or FEP, thus often used when a high continuous operating temperature and clarity are required.
 

PFA is a copolymer of the structure -A-B-A-B-A-B- (where A and B are different repeating units) and fits into the fluoropolymer family. 
 

PFA is a partially fluorinated copolymer of tetrafluoroethylene (TFE), the base material for PTFE, with a perfluoroalkoxy monomer (PFA). In the case of PFA the TFE and PFA do not combine in a ratio of 1:1 to give the straight -A-B-A-B-A-B- format, but combine in a ratio of 1:0.01 to give a copolymer of the format -A-A-A-A-A-A-B-A-A-A-A-A-A-B where there are approximately 100 A monomers for every B monomer. 

PFA was not the first melt-processable fluoropolymer but represented a major step forward in the fluoropolymer family. PFA was the first material to combine the best attributes of PTFE and FEP and is considered by some to be the best melt-processable fluoropolymer alternative to PTFE.