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PPE vs. Thermoset PI

PPE belongs to the thermoplastics classification, while thermoset PI belongs to the thermoset plastics. There are 18 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.

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

Metric UnitsUS Customary Units

Mechanical Properties

Elongation at Break, % 30
2.0 to 5.9
Flexural Strength, MPa 75
60 to 100
Tensile Strength: Ultimate (UTS), MPa 55
37 to 81

Thermal Properties

Glass Transition Temperature, °C 85
360
Heat Deflection Temperature At 1.82 MPa (264 psi), °C 120
370
Maximum Temperature: Autoignition, °C 430
380
Maximum Temperature: Mechanical, °C 90
260
Specific Heat Capacity, J/kg-K 1200
1130
Thermal Conductivity, W/m-K 0.22
0.29 to 1.7
Thermal Expansion, µm/m-K 90
38 to 54

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 MHz 2.7
3.1
Dielectric Strength (Breakdown Potential), kV/mm 19
20
Electrical Resistivity Order of Magnitude, 10x Ω-m 13
15

Otherwise Unclassified Properties

Density, g/cm3 1.1
1.4 to 1.6
Water Absorption After 24 Hours, % 0.23
0.14 to 0.24

Common Calculations

Strength to Weight: Axial, points 14
6.5 to 16
Strength to Weight: Bending, points 30
16 to 30
Thermal Diffusivity, mm2/s 0.17
0.18 to 0.95