Specification

 

PTFE = Polytetrafluoro ethylene
PFA = Perfluoro alkoxy
FEP = Fluorinated ethylene propylene

Properties of Fluoroplastics
Property ASTM test method PTFE PFA FEP
Physical properties
Specific gravity D792 2.15 2.15 2.15
Water absorption (%) D570 / 24 hrs 13"t <0.00 0.03 <0.01
Mold shrinkage
( cm/cm )
  0.02 - 0.05 0.04 0.03 - 0.06
Contact angle
(degree)
Angle to level 110 115 115
Thermal properties
Thermal conductivity
(cal/sec/cm2, oC/cm)
C177 6x10-4 6x10-4 6x10-4
Coefficient of linear thermal expansion
(1/oC)
D696 / 23 - 60oC 10x10-5 12x10-5 8x10-5
Melting point
(oC)
  327 302 - 310 270
Melt viscosity
(poise)
  1011- 1013
(340 - 380oC)
104- 105
(380oC)
4x104- 105
(380oC)
Maximum temp for continuous use
(oC/oF)
  260 / 500 260 / 500 200 / 392
Mechanical properties
Tensile strength
(kgf/cm2)
D638 / 23oC 140 - 350 280 - 315 190 - 220
Elongation(%) D638 / 23oC 200 - 400 280 - 300 250 - 330
Compression strength
(kgf/cm2)
D695/1% deformation, 25oC 50 - 60 50 - 60 50 - 60
Tensile modulus
(kgf/cm2)
D638 / 23oC 4000 3800 3500
Flexural modulus
(kgf/cm2)
D790 / 23oC 5000 - 6000 6600 - 7000 5500 - 6500
Impact strength
(ft-lb/in)
D256 / 23oC, Izod 3.0 No breakdown No breakdown
Hardness ( Shore ) Durometer D50 - D65 D60 D55
Deformation underload(%) D621/100oC, 70 kgf/cm2, 24 hrs 5.0 2.4 5.0
  D621/25oC, 140 kgf/cm2, 24 hrs 7.0 2.7 3.0
Static friction coefficient Coated - steel surface 0.02 0.05 0.05
Electrical properties
Dielectric constant D150 / 103 Hz 2.1 2.1 2.1
  D150 / 106 Hz 2.1 2.1 2.1
Dielectric dissipation factor D150 / 103 Hz <1x10-5 1x10-5 6x10-5
Dielectric breakdownstrength
(V / mil )
D149 / Short time, 1/8 in 480 500 500 - 600
Volume resistivity
(ohm - cm)
D257 >1018 >1018 >1018
Other properties
Chemical resistance   Excellent Excellent Excellent
Weatherability   Excellent Excellent Excellent
Combustibility(%) D2863/Oxygen
concentration index
<95 <95 <95

 

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