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FEP vs. PPE

Both FEP and PPE are thermoplastics. There are 23 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is FEP and the bottom bar is PPE.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 0.43
2.3
Elongation at Break, % 300
30
Flexural Strength, MPa 24
75
Tensile Strength: Ultimate (UTS), MPa 20
55

Thermal Properties

Glass Transition Temperature, °C 60
85
Heat Deflection Temperature At 1.82 MPa (264 psi), °C 50
120
Maximum Temperature: Autoignition, °C 630
430
Maximum Temperature: Mechanical, °C 200
90
Melting Onset (Solidus), °C 260
260
Specific Heat Capacity, J/kg-K 1170
1200
Thermal Conductivity, W/m-K 0.22
0.22
Thermal Expansion, µm/m-K 95
90

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 MHz 2.0
2.7
Dielectric Strength (Breakdown Potential), kV/mm 22
19
Electrical Resistivity Order of Magnitude, 10x Ω-m 16
13

Otherwise Unclassified Properties

Density, g/cm3 2.1
1.1
Water Absorption After 24 Hours, % 0.010
0.23

Common Calculations

Stiffness to Weight: Axial, points 0.11
1.2
Stiffness to Weight: Bending, points 12
42
Strength to Weight: Axial, points 2.6
14
Strength to Weight: Bending, points 7.6
30
Thermal Diffusivity, mm2/s 0.088
0.17
Thermal Shock Resistance, points 35
19