Polytetrafluoroethylene, Unfilled

Poly­te­tra­flu­o­roeth­yl­ene (PTFE), unfilled [Teflon®]


  • Chemical-resistant
  • Low– and high-temperature resistant
  • Weather-resistant
  • Low coef­fi­cient of friction
  • Elec­tri­cal and ther­mal insulation
  • Mechan­i­cal prop­er­ties can be enhanced by adding fillers (eg, glass fibers, car­bon, graphite, molyb­de­num disul­phide, bronze)

Com­mon uses

  • Printed cir­cuit boards
  • Plain bear­ings, gears and slide plates
  • Chute lin­ers
  • Wear strips

PTFE– (Teflon)

Mate­r­ial Specifications

ASTM or UL test Prop­erty Unfilled
D792 Den­sity (lb/in3)/(g/cm3) 0.078 (2.16)
D570 Water absorp­tion, 24 hrs (%) <0.01
D638 Ten­sile strength (psi) 3,900
D638 Ten­sile mod­u­lus (psi) 81,000
D638 Ten­sile elon­ga­tion at break (%) 300
D790 Flex­ural strength (psi) No break
D790 Flex­ural mod­u­lus (psi) 72,000
D785 Hard­ness, Shore D50
D256 Izod notched impact (ft-lb/in) 3.5
D696 Coef­fi­cient of lin­ear ther­mal
expan­sion (x 10–5 in./in./°F)
D648 Heat deflec­tion temp (F°/C°) at 264 psi 132/55
D3418 Melt­ing temp (F°/C°) 635/335
- Max oper­at­ing temp (F°/C°) 500/260
C177 Ther­mal con­duc­tiv­ity
UL94 Flam­ma­bil­ity rating V-O
D150 Dielec­tric con­stant at 1 MHz 2.1
D150 Dis­si­pa­tion fac­tor at 1 MHz 0.0002
D150 Dielec­tric strength (V/mil) 285
D257 Vol­ume resis­tiv­ity (ohm/cm) at 50% RH >1018

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.

Don’t see what you’re look­ing for? Call us at 800–423-2769 or email us at tom@crownplasticsinc.com.