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Thermoset PI vs. PBI

Both thermoset PI and PBI 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 thermoset PI and the bottom bar is PBI.

Metric UnitsUS Customary Units

Mechanical Properties

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

Thermal Properties

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

Electrical Properties

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

Otherwise Unclassified Properties

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

Common Calculations

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