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Teflon® AF Performance

What could you do with a product that has all of the outstanding properties of Teflon® fluoroplastics, is optically clear, has the lowest known dielectric constant of plastics, is resistant to creep under stress loads, and has limited solubility in select solvents?

Teflon® AF is a family of amorphous fluoroplastics with extraordinary performance characteristics when compared with other products currently available — properties that can be tailored for many high-performance requirements and demanding applications.

The Teflon® AF family of amorphous fluoroplastics is similar to Teflon® PTFE and PFA in many unusual properties, but is unique in the following ways:


  • A true amorphous fluoroplastic.
  • Somewhat higher coefficient of friction than Teflon® PTFE and PFA, but lower than Tefzel® ETFE.
  • Excellent mechanical and physical properties at end-use temperature up to 300°C (572°F).
  • Excellent light transmission from ultraviolet (UV) through a good portion of infrared (IR).
  • Very low refractive index.
  • Lowest dielectric constant of any plastic even at gigahertz frequencies.
  • Limited solubility in selected perfluorinated solvents.
  • The ability to tailor the glass transition temperatures (Tg) for desired end-use characteristics, thus achieving the best balance of other properties.

For more detail, see the unique properties of Teflon® AF.

Comparison of Performance Characteristics

  Teflon® AF Teflon® PFA
Morphology Amorphous Semicrystalline
Optical Clarity Clear: >95% Translucent to Opaque
Upper Use Temperature, °C (°F) 285 (545) 260 (500)
Thermal Stability, °C (°F) 360 (680) 380 (716)
Thermal Expansion (linear), ppm/°C 80 150
Water Absorption No No
Weatherability Outstanding Outstanding
Flame Resistant LOI, % 95 95
Tensile Modulus, MPa (psi) 950–2150 (137,786–311,832) 271–338 (39,305–49,023)
Creep Resistance Good Low
Solubility Selected solvents No
Resistance to Chemical Attack Excellent Excellent
Surface-Free Energy Low Low
Refractive Index 1.29–1.31 1.34–1.35
Dielectric Constant 1.89–1.93 2.1

* Values are typical.