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PEI vs. PTFE

Both PEI and PTFE are thermoplastics. There are 16 material properties with values for both materials. Properties with values for just one material (15, in this case) are not shown.

For each property being compared, the top bar is PEI and the bottom bar is PTFE.

Metric UnitsUS Customary Units

Mechanical Properties

Compressive (Crushing) Strength, MPa 140 to 180
6.9 to 24
Elongation at Break, % 3.0 to 34
75 to 300
Flexural Modulus, GPa 3.4 to 5.9
0.4 to 1.3
Flexural Strength, MPa 140 to 210
13 to 50
Tensile Strength: Ultimate (UTS), MPa 110 to 160
13 to 25

Thermal Properties

Heat Deflection Temperature At 1.82 MPa (264 psi), °C 200 to 210
66 to 70
Maximum Temperature: Mechanical, °C 170
260 to 270
Thermal Conductivity, W/m-K 0.18 to 0.23
0.24 to 0.65
Thermal Expansion, µm/m-K 20 to 53
110 to 120

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 MHz 3.2 to 3.7
2.1 to 2.4
Electrical Resistivity Order of Magnitude, 10x Ω-m 14 to 15
2.0 to 18

Otherwise Unclassified Properties

Density, g/cm3 1.3 to 1.5
2.1 to 2.3
Limiting Oxygen Index (LOI), % 47 to 50
90
Water Absorption After 24 Hours, % 0.17 to 0.25
0.0093 to 0.050

Common Calculations

Strength to Weight: Axial, points 24 to 30
1.7 to 3.2
Strength to Weight: Bending, points 40 to 44
5.7 to 8.7