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PPE vs. PEI

Both PPE and PEI are thermoplastics. There are 22 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

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

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 2.3
3.4 to 5.6
Elongation at Break, % 30
3.0 to 34
Flexural Strength, MPa 75
140 to 210
Tensile Strength: Ultimate (UTS), MPa 55
110 to 160

Thermal Properties

Glass Transition Temperature, °C 85
210
Heat Deflection Temperature At 1.82 MPa (264 psi), °C 120
200 to 210
Maximum Temperature: Autoignition, °C 430
530
Maximum Temperature: Mechanical, °C 90
170
Specific Heat Capacity, J/kg-K 1200
1050 to 1220
Thermal Conductivity, W/m-K 0.22
0.18 to 0.23
Thermal Expansion, µm/m-K 90
20 to 53

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 MHz 2.7
3.2 to 3.7
Dielectric Strength (Breakdown Potential), kV/mm 19
30 to 33
Electrical Resistivity Order of Magnitude, 10x Ω-m 13
14 to 15

Otherwise Unclassified Properties

Density, g/cm3 1.1
1.3 to 1.5
Water Absorption After 24 Hours, % 0.23
0.17 to 0.25

Common Calculations

Stiffness to Weight: Axial, points 1.2
1.5 to 2.1
Stiffness to Weight: Bending, points 42
39
Strength to Weight: Axial, points 14
24 to 30
Strength to Weight: Bending, points 30
40 to 44
Thermal Diffusivity, mm2/s 0.17
0.11 to 0.14
Thermal Shock Resistance, points 19
44 to 100