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Material Information

FEP belongs to the fluorocarbon family of thermoplastics. It is a relatively soft material and has lower tensile strength, wear resistance, and creep resistance than many other engineering plastics. FEP has the same mechanical properties, excellent chemical resistance, weatherability, and electrical properties as PTFE but has a narrower temperature range (-454º F to 400º F), is melt-processable, and has much better clarity. Because of this clarity, FEP offers the lowest refractive index of all thermoplastics. Its weatherability also makes it an excellent resistor to ozone and sunlight. FEP’s properties make it ideal for use in tubing with thin walls that can be mechanically expanded or heat shrunk. FEP can be heat sealed, thermoformed, welded, vacuum formed, heat bonded, metallized, laminated, and used as a hot-melt adhesive. It is available in the forms of film, sheet, rod, and tubing. It is clear in thin sections that become translucent in thicker sections.


  • Solid pipe and fitting
  • Roll covers
  • Fire alarm cable
  • Aircraft wire
  • Glazing for solar energy collectors (film)
  • Electrical insulator
  • Inert bags for medical applications
  • Environmental enclosures
  • Protective clothing
  • Liner for steel pipe and fitting
  • Glass backed sheet for lining vessels
  • Tubing
  • Heat shrinkable tubing
  • Coated fabrics
  • Coating for films
  • Fiber optics coating


  • High clarity
  • Excellent weatherability
  • Chemically inert
  • Low tensile strength, wear resistance, and creep resistance
  • Low permeability to liquids, gases, moisture, and organic vapors
  • High dielectric strength
  • Superior antistick and low frictional properties
  • High resistance to impact and tearing
  • Inert to outdoor exposure
  • Exceptional heat resistance
  • High degree of stress crack resistance


PhysicalAstm Test MethodFEP
Density (lb/in^3)D7920.078
Specific GravityD7922.15
Water Absorption @ 24 hours (%)D570
Tensile Strength (PSI)D6383,400
Tensile Modulus (PSI)D638
Tensile Elongation at Break (%)D638325
Flexural Strength (PSI)D790No Break
Flexural Modulus (PSI)D79085,000
Izod Impact (Notched), ft-lb/inD256
Shore D HardnessD785D56
Melting Point, °FD3418500
Continous Service Temp (Operating), °F400
Flammability RatingUL94VO
Arc Resistance (sec)D495
Volume Resistivity (ohm-cm) @ 50% RHD257>10^18
Dielectric Constant at 1 MHZD1502.1
Dissipation Factor at 1 MHZD150

Disclosure: The information contained herein are typical values intended for reference and comparison purposes only. They should NOT be used as a basis for design specifications or quality control. Contact us for manufacturers’ complete material property datasheets. All values at 73°F (23°C) unless otherwise noted.


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