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Fluorinated ethylene propylene

FEP is an inert transparent Fluoropolymer that exhibits excellent chemical resistance, high dielectric strength and has a wide thermal range.

Brand Names

  • Teflon® FEP
  • Norton® FEP


  • High temperature resistance
  • Cryogenically stable
  • Superior chemical resistance
  • Inert & non-contaminating
  • High dielectric strength
  • Optically transparent

Common Applications

  • Thermoformed components
  • Heat sealed bags
PropertyTest MethodTypical Value
  English unitsSI Units
Available Thickness Range-2 – 20 mil51 - 508µm
Max. Operating Temp.-400ºF205°C
Melt PointASTM D-3418500 - 540ºF250 - 280°C
Dielectric Strength, 1milASTM D-2576500 V/mil260 kV/mm
Dielectric ConstantASTM D-1502.12.1
Specific GravityASTM D-7922.12 - 2.172.12 - 2.17
Tensile StrengthASTM D-8823500 psi24 MPa

Teflon® is a registered Trademark of DuPont used under license by Welch Fluorocarbon, Inc. Norton® is a registered trademark of Saint-Gobain.

Note: The information displayed on the Welch Fluorocarbon, Inc. website should be utilized for evaluation and reference purposes only, and should not be used as a definitive source. It is the user’s responsibility to test the suitability of any material for their particular end use.