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FEP polymer

FEP polymer

FEP polymer

FEP polymer

fep polymer (Fluorinated ethylene propylene) is a co polymer of hexafluoropropylene en tetrafluoroethylene.  While FEP and PTFE are simular in many aspects, there are clear differences:

  • Lower thermic stabitity. FEP keeps its properties at temperatures of -200 to 204 ° C
  • Higher friction coefficient

  • More transparent than PTFE

  • Better gas and vapor permeability

  • Excellent UV transmission

Films made of FEP polymer are available from stock in thichnesses between 25 and 1000 micron.

Please find typical values of FEP polymer below:

PROPERTY VALUE UNITS METHOD
Mechanical Properties
Tensile Strength, 23°C 2100-3050
14.5-21
psi
MPa
Elongation at break, 23°C 240-300 %
Flexural Strength, 23°C No break at flexure D 790
Impact Strength, Izod No break
Yield Strength At 23°C 1740
12
psi
MPa
Density 2.12-2.17 gm/cu.cm
Thermal Properties
Coefficient of Linear Expansion 20-100 °C 12 x 10-5 K-1 D 696
Melting Point 253-282 °C
Thermal Conductivity 1.45
0.209
Btu/hr-.ft-deg F
W/m/deg K
Service Temperature -250-200 °C
Processing Temperature 370-395 °C
Electrical Properties
Dielectric Strength, short time, 2mm MV m-1
Surface Arc-Resistance >300
(does not track)
sec D 495
Volume Resistivity, dry, @ 50% RH >1018 ohm-cm D 257
Surface Resistivity, @ 100% RH 1016 Ohm/sq D 257
Dielectric Constant, 60 to 2 x 109 cps 2.1 ε D150-81
Dielectric Strength 13-100 kV mm-1 D149
Dissipation Factor @ 60 Hz – 1 MHz <0.0001 D150-81
Other Properties
Refractive Index 1.344 nD 25 D 542
Water Absorption <0.1 % D570-81
Flame Rating+ VE-0 UL-94
Limiting Oxygen Index 95 % Oxygen D 2863
Resistance to Weathering Excellent
Specific Gravity 2.1-2.3 D792-66
(1979)
Coefficient of friction 0.27–0.67 D 1894

 

Other FEP products:

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