Thermoplastic PI vs. PBI
Thermoplastic PI belongs to the thermoplastics classification, while PBI belongs to the thermoset plastics. There are 14 material properties with values for both materials. Properties with values for just one material (15, in this case) are not shown.
For each property being compared, the top bar is thermoplastic PI and the bottom bar is PBI.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 3.7 to 20 | |
| 5.9 |
| Elongation at Break, % | 1.8 to 7.5 | |
| 3.0 |
| Flexural Modulus, GPa | 3.8 to 19 | |
| 6.5 |
| Flexural Strength, MPa | 170 to 330 | |
| 220 |
| Tensile Strength: Ultimate (UTS), MPa | 110 to 220 | |
| 160 |
Thermal Properties
| Glass Transition Temperature, °C | 260 | |
| 410 |
| Maximum Temperature: Decomposition, °C | 530 | |
| 590 |
| Specific Heat Capacity, J/kg-K | 970 to 1100 | |
| 930 |
Otherwise Unclassified Properties
| Density, g/cm3 | 1.4 to 1.5 | |
| 1.3 |
| Limiting Oxygen Index (LOI), % | 35 | |
| 58 |
Common Calculations
| Stiffness to Weight: Axial, points | 1.5 to 7.9 | |
| 2.5 |
| Stiffness to Weight: Bending, points | 37 to 64 | |
| 46 |
| Strength to Weight: Axial, points | 22 to 42 | |
| 34 |
| Strength to Weight: Bending, points | 36 to 57 | |
| 50 |