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PPE vs. FEP

Both PPE and FEP 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 PPE and the bottom bar is FEP.

Metric UnitsUS Customary Units

Mechanical Properties

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

Thermal Properties

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

Electrical Properties

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

Otherwise Unclassified Properties

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

Common Calculations

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