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TEFLON® Fiber Properties

A summary of the stress-strain and gross properties for unbleached TEFLON® PTFE Fiber is shown in the table below.

Typical Properties for Natural TEFLON® PTFE fluoropolymer fiber

Yarn denier: filaments (dtex: filaments)

400-60 (440-60)

Stress-Strain Properties**


Straight Test


Tensile strength, psi (MPa)

52,500 (362)

Breaking strength, Ibs (N)

1.7 (7.6)

Breaking tenacity, g/den. (cN/tex)

2.0 (19.6)

Elongation at break, %


Initial modulus, g/den. (cN/tex)

13.0 (127.4)

Loop test


Tensile strength, psi (MPa)

31,000 (214)

Breaking strength, lbs (N)

1.8 (8.0)

Elongation at break, %


Thermal Properties


Shrinkage alter 30 minutes, % in water at 212°F (100°C)


  in air at 350°F (177C)


Specific heat, cal/g•oC (J/kg•K)

0.25 (1.046)

Thermal conductivity, BTU/h•ft2•oF for 1" of thickness


(W/m2•K for 1cm of thickness)  

1.7 (245)

Zero strength temperature***, oF (°C)

590 (310)

Gel temperature, F (°C)

621 (327)

Sublimation rate, % weight loss/hourat 554°F (290oC)


  at 806°F (430oC)


General Properties


Specific gravity


Moisture regain, %


**Stress-strain properties were determined on an "Instron" tensile tester at 70°F (21°C), 65% R.H.
*** Temperature at which the yarn breaks under a load of 0.1 g/den. (0.98 cN/tex)
Coefficient of Friction of TEFLON® PTFE

Coefficient of Friction Chart
The coefficient of friction of TEFLON® PTFE fluoropolymer fiber is the lowest of all known fibers. The static coefficient of friction is only slightly higher than the dynamic value, so TEFLON® does not exhibit "stick-slip" behavior.

The dynamic coefficient of friction of TEFLON® PTFE fluoropolymer fiber decreases with an increase in either load or temperature (see Figure 3). Dynamic coefficient of friction values as low as 0.008 have been measured when a self­1 ubricated bearing containing TEFLON® fiber was tested against steel.

Electrical Properties of TEFLON® PTFE

TEFLON® PTFE fluoropolymer resin is an excellent insulator. The insulating values of bleached TEFLON® PTFE fluoropolymer fiber approach those of the resin for which the following values have been measured at room temperature:

dielectric constant* * of 2.1 for frequencies up to 109cycles per second (109Hz).
dissipation factor* * <0.0001 for frequencies up to 106 cycles per second (106 Hz), with a peak value of 0.0004 at 109cycles per second (109Hz).
dielectric strength*** of 4 kV/mil (1.6 MV/cm) for a specimen 1 mil (0.025 mm) thick and 2 kV/mil (0.8 MV/cm) for a thickness of 10 mils (0.25 mm).
* * ASTM Test Method D150-54T
*** ASTM Test Method D149-59 (short time test)

Chemical Resistance of TEFLON® PTFE

TEFLON® PTFE fluoropolymer fiber is the most chemically resistant fiber known. It is inert to powerful oxidizing agents and to such reagents as boiling sulfuric acid, fuming nitric acid, boiling aqua regia (mixed sulfuric and nitric acids), and boiling (saturated) sodium hydroxide. The only known solvents for TEFLON® PTFE fluoropolymer fiber or resin are selected perfluorinated organic liquids at temperatures above 570°F (299°C).
Heat Resistance of TEFLON® PTFE

The maximum temperature to which TEFLON® PTFE fluoropolymer fiber can be exposed for long periods is 550°F (288°C), but the fiber can toler­ate brief exposures to temperatures as high as 600°F (316°C). Continuous exposure to tempera­tures below 400°F (204°C) ordinarily does not degrade TEFLON® PTFE fluoropolymer fiber.

Selected physical properties of TEFLON® PTFE fluoropolymer fiber after exposure to elevated tem­peratures in air are summarized in the table below.

Yarn Properties of TEFLON® PTFE fluoropolymer fiber after exposure to high temperatures**
Air Temperature Exposure Time Breaking Strength Elongation at Break Work-to-Break Heat
ºF(ºC) Hours Retained, % Retained, % Retained, % Shrinkage, %
350(177) 1 101 182 156 6.3
  10 99 191 156 6.5
  1000 94 210 178 11.1
550 (288) 1 85 385 267 22.6
  10 91 427 300 20.2
  1000 69 512 322 24.1
700(371) 1   Deteriorated; testing not possible    
**Data were obtained at room temperature using specimens of 400-denier(440dtex) natural TEFLON® yarn

Service Temperature Range of TEFLON® PTFE

TEFLON® PTFE fluoropolymer fiber is stable over a wide range of temperatures. The fiber becomes less ductile at extremely low temperatures and softens at extremely high temperatures. Experi­ence shows that adequate toughness and strength are available for selected uses at temperatures as low as -450°F (-268°C) and as high as 550°F (288°C).

Sunlight and Weather Resistance

TEFLON® PTFE fluoropolymer fiber has outstand­ing sunlight and weather resistance. Continuous exposure to direct Florida sunlight and weather for three years resulted in only a 2% measured loss in yarn breaking strength.


TEFLON® brand fibers are one of the most non-flamabile organic fibers available.  Our fibers do not melt or drip and have a limiting oxygen index (LOI) of greater than 95 for our bleached fibers.

Color Dying

TEFLON® brand fluoropolymer fibers are not dyeable.  At this time we offer our fiber in natural (dark brown) and bleached (white).  It is possible to add color to our spun yarns by dying the non-fluoropolymer fibers in the blend.  If you are intersted in this approach, please contact us.


Teflon is a registered trademark of E.I. DuPont Company. Toray is licensed by DuPont to use the Teflon trademark.

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