Fluorinated Ethylene Propylene (FEP)

Definition - What does Fluorinated Ethylene Propylene (FEP) mean?

Fluorinated ethylene propylene (FEP) refers to a chemical substance composed of hexafluoropropylene and tetrafluoroethylene that have been linked to form a copolymer. FEP is a widely used corrosion prevention coating for metallic surfaces due to its advantageous properties of both non-reactivity and low friction.

Corrosionpedia explains Fluorinated Ethylene Propylene (FEP)

The molecular structure of FEP as shown below depicts the long chain molecular bonds that give fluorinated ethylene propylene its key features, which includes:

  • Excellent thermal stability
  • Non-reactivity
  • Non-stick texture
  • High UV ray transparency and transmittance
  • Low refractive index, low light reflection
  • Nonporous
  • Excellent resistance to ozone
  • Low dielectric constant


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