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PTFE Typical Technical Data

ASTM or UL test Property PTFE
(unfilled)
PTFE
(25% glass filled)
PTFE
(25% carbon filled)
PHYSICAL
D792 Density (lb/in³)
(g/cm³)
0.078
2.16
0.081
2.25
0.075
2.08
D570 Water Absorption, 24 hrs (%) < 0.01 0.02 0.05
MECHANICAL
D638 Tensile Strength (psi) 3,900 2,100 1,900
D638 Tensile Modulus (psi) 80,000 - -
D638 Tensile Elongation at Break (%) 300 270 75
D790 Flexural Strength (psi) No break 1,950 2,300
D790 Flexural Modulus (psi) 72,000 190,000 160,000
D695 Compressive Strength (psi) 3,500 1,000 1,700
D695 Compressive Modulus (psi) 70,000 110,000 87,000
D785 Hardness, Shore D D50 D60 D62
D256 IZOD Notched Impact (ft-lb/in) 3.5 - -
THERMAL
D696 Coefficient of Linear Thermal Expansion
(x 10-5 in./in./°F)
7.5 6.4 6.0
D648 Heat Deflection Temp (°F / °C)
at 264 psi

132 / 55

150 / 65

150 / 65
D3418 Melting Temp (°F / °C) 635 / 335 635 / 335 635 / 335
- Max Operating Temp (°F / °C) 500 / 260 500 / 260 500 / 260
C177 Thermal Conductivity
(BTU-in/ft²-hr-°F)
(x 10-4 cal/cm-sec-°C)

1.70
5.86

3.1
10.6

4.5
15.5
UL94 Flammability Rating V-O V-O V-O
ELECTRICAL
D149 Dielectric Strength (V/mil) short time, 1/8" thick 285 - -
D150 Dielectric Constant at 1 MHz 2.1 2.4 -
D150 Dissipation Factor at 1 MHz < 0.0002 0.05 -
D257 Volume Resistivity (ohm-cm)at 50% RH > 1018 > 1015 104