Perfluoroalkoxy alkane

PFA
Density[1] 2150 kg/m3
Flexural modulus(E) 586 MPa
Tensile strength(t) 24 MPa
Elongation @ break 300%
Folding endurance No break
Notch test
Melting point 315 °C
Maximum operating
   temperature 260 °C
Water absorption (ASTM) <0.03 % after 24 hours
Dielectric constant (Dk)
   at 1MHz 2.1
Dissipation factor
   at 1MHz 0.0001
Arc resistance < 180 seconds
Resistivity at 50% R.H. > 1016 Ω m
Perfluoroalkoxy alkane polymers are used to fabricate tube to handle aggressive chemicals.

Perfluoroalkoxy alkanes or PFA are fluoropolymers. They are copolymers of tetrafluoroethylene (C2F4) and perfluoroethers (C2F3ORf, where Rf is a perfluorinated group such as trifluoromethyl (CF3)). In terms of their properties, these polymers are similar to polytetrafluoroethylene (PTFE). The big difference is that the alkoxy substituents allow the polymer to be melt-processed. On a molecular level, PFA has a smaller chain length, and higher chain entanglement than other fluoropolymers. It also contains an oxygen atom at the branches. This results in a material that is more translucent and has improved flow, creep resistance, and thermal stability close to or exceeding PTFE.[2] Similarly advantaged processing properties are found in fluorinated ethylene propylene (FEP), the copolymer of tetrafluoroethylene and hexafluoropropylene.[3]

References

  1. ↑ "PTFE, FEP, and PFA Specifications". Boedeker Corp. 2007. Retrieved 2007-12-22.
  2. ↑ "PFA Properties". Fluorotherm Polymers. 2010. Retrieved 2014-02-12.
  3. ↑ Günter Siegemund, Werner Schwertfeger, Andrew Feiring, Bruce Smart, Fred Behr, Herward Vogel, Blaine McKusick "Fluorine Compounds, Organic" Ullmann's Encyclopedia of Industrial Chemistry, Wiley-VCH, Weinheim, 2002. doi:10.1002/14356007.a11_349


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