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TPE/P (Aflas ®)

Common Name: Aflas ®, TFE/P, FEPM
Chemical Name: Tetrafluoroethylene / Propylene
ASTM D1418 Designation: FEPM

General Characteristics

Hardness Range (Shore A): 70-90
Tensile Strength Range (psi): 1700-3000
Elongation (Max %): 250-350
Compression Set: Good
Abrasion Resistance: Good
Tear Resistance: Good
Solvent Resistance: Excellent
Oil Resistance: Excellent
Low Temperature: 25°F
High Temperature: +450°F


  • Resistant to a wide range of chemicals, oil, strong acids, bases, alkalis, amines, brake fluid (including DOT 3), steam & hot water, methanol fuels.
  • Superior electrical insulation compared to standard fluoroelastomers
  • TFE/P can be compounded to resist rapid gas decompression (explosive decompression).
  • Recommended for high pressure/ high temperature applications.


  • Not recommended for mineral oils, aeromatic oils, low temperature performance.
  • Aflas ® is a copolymer of tetrafluoroethylene and propylene (TPE/P) with a fluorine content of 57% and are peroxide cured or electron beam cured. It offers excellent chemical and high heat resistance compared to standard fluoroelastomer (aka Viton ®) compounds.
  • TPE/P elastomers are widely used in the automotive industry as automobile engine become more powerful and operate at higher temperatures and as performance engine oils are formulated with amine-based additives. The wire an cable industry also uses TPE/P elastomers because of the high heat resistance. TPE/P elastomers are also made into O-rings, gaskets seals, packings.
  • TPE/P/VdF is a Terpolymer of tetrafluoroethylene, propylene and vinylidene fluoride with a a peroxide cure and a fluorine content 60%. TPE/P/VdF offer a lower operating temperature with a glass transition temperature around -13°C compared to -3°C of the TPE/P compounds.

Fluorocarbon Types

  • TFE/P – Dipolymer of tetrafluoroethylene and propylene
  • TFE/P/VdF – Terpolymer of tetrafluoroethylene, propylene and vinylidene fluorid


AFLAS ® is a registered trademark of Asahi Glass Co., Ltd.

Viton ® is a a registered trademark of DowDupont Elastomers.