Differences between PTFE (Teflon), FEP, and PFA
September 11, 2009
The name, “Teflon” is Dupont’s trademark name for its family of fluoropolymers. At times, it is mistaken that DuPont’s trademark name is meant only to refer to the fluoropolymer, PTFE, when FEP and PFA also can be used under the appellation.
Industry experts also use other names to refer to the fluoropolymers. FEP, PFA, and PTFE are also known under names such as THV, PVDF, ETFE, ECTFE, and CTFE.
Though all of the fluoropolymers can be cataloged in the same family, they vary slightly in regards to thermal and mechanical properties.
PTFE and PFA have a raised temperature tolerance in comparison to FEP.
FEP and PFA are clear, yet PTFE is translucent. FEP and PFA have better mechanical properties in comparision to PTFE.
The main differences are in regards to chemical inertness, corrosion resistance ,permeability, and FDA approval.