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PPSU vs. Thermoset PI

PPSU belongs to the thermoplastics classification, while thermoset PI belongs to the thermoset plastics. There are 23 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

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

Metric UnitsUS Customary Units

Mechanical Properties

Compressive (Crushing) Strength, MPa 140
120 to 210
Elongation at Break, % 26
2.0 to 5.9
Flexural Modulus, GPa 4.7
3.1 to 4.8
Flexural Strength, MPa 130
60 to 100
Impact Strength: Notched Izod, J/m 80
21 to 43
Tensile Strength: Ultimate (UTS), MPa 95
37 to 81

Thermal Properties

Glass Transition Temperature, °C 220
360
Heat Deflection Temperature At 1.82 MPa (264 psi), °C 210
370
Maximum Temperature: Autoignition, °C 580
380
Maximum Temperature: Decomposition, °C 560
330
Maximum Temperature: Mechanical, °C 160
260
Specific Heat Capacity, J/kg-K 970
1130
Thermal Conductivity, W/m-K 0.24
0.29 to 1.7
Thermal Expansion, µm/m-K 45
38 to 54

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 MHz 3.4
3.1
Dielectric Strength (Breakdown Potential), kV/mm 16
20
Electrical Resistivity Order of Magnitude, 10x Ω-m 14
15

Otherwise Unclassified Properties

Density, g/cm3 1.4
1.4 to 1.6
Limiting Oxygen Index (LOI), % 38
40
Water Absorption After 24 Hours, % 0.44
0.14 to 0.24

Common Calculations

Strength to Weight: Axial, points 19
6.5 to 16
Strength to Weight: Bending, points 33
16 to 30
Thermal Diffusivity, mm2/s 0.17
0.18 to 0.95