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 |