Summery of properties for PTFE, PFA and FEP

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Property

Specification

Unit

Material
 

(ASTM)

  

PTFE

PFA

 FEP
General
Continuous service temperature Maximum ¢XC 260 260 200
¢X F 500 500 392
Chemical resistance  

-

 Excellent Excellent Excellent
Specific gravity D 792 - 2.15 2.15 2.15
Electrical
Dielectric constant D 150 at 103 Hz

-

2.1

 2.1 2.1
D 150 at 106 Hz

-

 2.1 2.1 2.1
Dielectric dissipation factor D 150 at 103 Hz

-

 0.0002 0.0002 0.0001
D 150 at 106 Hz - 0.0002 0.0003 0.0008
Dielectric strength
(short term) 10 mils film		 D 149 Volt/mil > 1 400 2 000 2 000
Volume resistivity

D 257

Ohm¡Pcm

 >1018 >1018 >1018
Enviromertal
Water absorption D 570 % < 0.01 < 0.03 <0.01
Weather resistance - - Excellent Excellent Excellent
Oxygen index D 2863 % > 95 > 95 >95
Flammability UL 94 - V-0 V-0 V-0
Mechanical
Tensile strength

D 1708, D 638

 psi 3 500 4 000 3 500
Elongation D 1708, D 638 % 300 300 300
Compressive strength D 695 psi 3 500 2 200 2 200
Impact strength D 256 at +23¢XC Ft-Lb/in 3.5 No Break No Break
Flexural Modulus D 790 at +23¢XC psi 90 000 100 000 95 000
Tensile Modulus D 638 psi 80 000 40 000 50 000
Hardness D 2240 - D-60 D-60 D-55
Thermal
Melting point   ¢X C 327 305 270
  ¢X F 620 581 518
Thermal conductivity C-177 BTU/hr/ft2
/¢XF.in		 1.7 1.3 1.4
Deflection temperature
66 psi
264 psi

D 648

 ¢X C 122
55		 74
48		 59
57
Deflection temperature
66 psi
264 psi		 D 648 ¢X F 252
131		 166
118		 138
134