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PBI vs. Thermoset PI

Both PBI and thermoset PI are thermoset plastics. There are 22 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 PBI and the bottom bar is thermoset PI.

Metric UnitsUS Customary Units

Mechanical Properties

Compressive (Crushing) Strength, MPa 350
120 to 210
Elongation at Break, % 3.0
2.0 to 5.9
Flexural Modulus, GPa 6.5
3.1 to 4.8
Flexural Strength, MPa 220
60 to 100
Impact Strength: Notched Izod, J/m 27
21 to 43
Tensile Strength: Ultimate (UTS), MPa 160
37 to 81

Thermal Properties

Glass Transition Temperature, °C 410
360
Heat Deflection Temperature At 1.82 MPa (264 psi), °C 430
370
Maximum Temperature: Decomposition, °C 590
330
Maximum Temperature: Mechanical, °C 340
260
Specific Heat Capacity, J/kg-K 930
1130
Thermal Conductivity, W/m-K 0.41
0.29 to 1.7
Thermal Expansion, µm/m-K 23
38 to 54

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 MHz 3.8
3.1
Dielectric Strength (Breakdown Potential), kV/mm 23
20
Electrical Resistivity Order of Magnitude, 10x Ω-m 13
15

Otherwise Unclassified Properties

Density, g/cm3 1.3
1.4 to 1.6
Limiting Oxygen Index (LOI), % 58
40
Water Absorption After 24 Hours, % 0.4
0.14 to 0.24

Common Calculations

Strength to Weight: Axial, points 34
6.5 to 16
Strength to Weight: Bending, points 50
16 to 30
Thermal Diffusivity, mm2/s 0.34
0.18 to 0.95