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 Type III and Type IV, which are the grades with the lowest melt flow rates and most suitable for compression molding.

PBY Material Codes:

PB21000M - FEP Type III

PB21002F - FEP Type IV

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FEP Spec. Summary

Property Test Method Units FEP TYPE III FEP TYPE IV
Color - - Translucent to White Translucent to White
Specific Gravity ASTM D792 - 2.120 - 2.170 2.120 - 2.170
Hardness Shore D ASTM D2240 - 59 - 69 59 - 69
Tensile Strength, min. ASTM D2116 PSI [MPa] 3,000 [20.7]  2,700[18.7]
Elongation at Break, min. ASTM D2116 % 275 275
Service Temperature High - °F [°C] 392 [200] 392 [200]
Service Temperature Low - °F [°C] -436 [-260] -436 [-260]
Second Melt Peak Temp. ASTM D3418 °F [°C] 500 [260] 500 [260]
Glass Transition Temp. ASTM D3418 °F [°C] 176 [80] 176 [80]

Material Available In:

FEP Rods

FEP Tubes

FEP Sheets

FEP Material 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

FEP Material Properties

  • Fluid Handling and chemical processing equipment

  • Pipe Linings and Pump Housings

  • Wet Bench Equipment

  • Packaging Equipment and Food Processing

  • Medical Components

FEP Requirements

PB21000M meets ASTM D2116 Type III requirements.

PB21002F meets ASTM D2116 Type IV requirements.

FEP Material Data Sheet Downloads

PB21000M - Material Data Sheet

PB21002F - Material Data Sheet

FEP 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