Fluorinated Ethylene Propylene (FEP) is a melt-processable copolymer of tetrafluoroethylene (PTFE) and hexafluoropropylene (HFP). 

A variety of FEP materials with different melt viscosity are available by modifying the percentage of HFP. FEP offers the same excellent combination of properties characteristic of PTFE such as non-aging characteristics, chemical inertness, exceptional dielectric properties, low flammability, heat resistance, toughness and flexibility, low coefficient of friction, non-stick characteristics, and negligible moisture absorption.

However, FEP is softer than PTFE. FEP is highly transparent and has excellent weather resistance, especially to UV. PB21000 materials meet the requirements of ASTM D2116.

PBY Material Codes:

PB21000M - FEP

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FEP Properties

  • Chemically inert to a wide range of industrial chemicals and solvents

  • Temperature range: -436°F to +392°F

  • Low coefficient of friction

  • Stress crack resistance

  • Good electrical properties

  • Outdoor weathering resistance

Typical Applications

  • Fluid Handling and chemical processing equipment

  • Pipe Linings and Pump Housings

  • Wet Bench Equipment

  • Packaging Equipment and Food Processing

  • Medical Components


PB21000M meets ASTM D2116 Type III requirements.


PB21000M - Material Data Sheet

Spec. Summary
Property Test Method Units Typical Values
Color - - Translucent to White
Specific Gravity ASTM D792 - 2.120 - 2.170
Hardness Shore D ASTM D2240 - 59 - 69
Tensile Strength, min. ASTM D2116 PSI [MPa] 3,000 [20.7]
Elongation at Break, min. ASTM D2116 % 275
Service Temperature High - °F [°C] 392 [200]
Service Temperature Low - °F [°C] -436 [-260]
Second Melt Peak Temp. ASTM D3418 °F [°C] 500 [260]
Glass Transition Temp. ASTM D3418 °F [°C] 176 [80]

Spec. Compliance



  • Wypych, George. Handbook of Polymers. 2nd Ed., ChemTec/Publishing, 2016.
  • Ebnesjjad, Sina. Fluoroplastics Vol1 & Vol2. 2nd Ed., Elsevier Inc., 2015.
  • Aerospace Materials Specifications for PTFE materials (AMS3678)
  • American Society for Testing and Materials (ASTM) Standards