ETFE (polyethylene-co-tetrafluoroethylene) [Tefzel®]


  • High cor­ro­sion resis­tance and strength over a wide tem­per­a­ture range
  • Very high melt­ing point
  • Excel­lent chem­i­cal, elec­tri­cal and high energy radi­a­tion resistance

Com­mon uses

  • Tank con­struc­tion and linings
  • Wire and cables (insu­la­tion and jacketing)
  • Cryo­genic appli­ca­tions (super-cold refrig­er­a­tion components)
  • Valves (lin­ings, seats and seals)
  • Com­pres­sors and pumps (lin­ings and components)
  • Stock shapes — for machin­ing components



Mate­r­ial Specifications

ASTM or UL test Prop­erty Value
D792 Den­sity (lb/in3)/(g/cm3) 0.061 (1.7)
D570 Water absorp­tion, 24 hrs (%) <0.1
D638 Ten­sile strength (psi) 6,100
D638 Ten­sile mod­u­lus (psi) -
D638 Ten­sile elon­ga­tion at break (%) 300
D790 Flex­ural strength (psi) -
D790 Flex­ural mod­u­lus (psi) 145,000
D2240 Hard­ness, Rockwell D67
D256 Izod notched impact (ft-lb/in) No break
D696 Coef­fi­cient of lin­ear thermal

expan­sion (x 10–5 in/in/F°/C°)

D648 Heat deflec­tion temp at 264 psi -
D3418 Melt­ing temp (F°/C°) 512/267
- Max oper­at­ing temp (F°/C°) 311/155
C177 Ther­mal con­duc­tiv­ity
(BTU-in/ft2–h– F°)
UL94 Flam­ma­bil­ity rating V-O
D149 Dielec­tric strength (V/mil)
short time, ⅛” thick
D150 Dielec­tric con­stant at 1 MHz 2.5
D150 Dis­si­pa­tion fac­tor at 1 MHz 0.0060
D257 Vol­ume resis­tiv­ity (ohm/cm) at 50% RH 1017

These are typ­i­cal val­ues for ref­er­ence and com­par­i­son only. They should not be used as a basis for design spec­i­fi­ca­tions or qual­ity con­trol. Con­tact us for the man­u­fac­tur­ers’ com­plete mate­r­ial prop­erty datasheets. All val­ues were taken at 73°F (23°C) unless oth­er­wise noted.

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