PET vs. PBI
PET belongs to the thermoplastics classification, while PBI belongs to the thermoset plastics. There are 16 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 PET and the bottom bar is PBI.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 3.5 to 11 | |
| 5.9 |
| Elongation at Break, % | 2.5 to 70 | |
| 3.0 |
| Flexural Modulus, GPa | 8.3 to 14 | |
| 6.5 |
| Impact Strength: Notched Izod, J/m | 43 to 85 | |
| 27 |
| Tensile Strength: Ultimate (UTS), MPa | 60 to 140 | |
| 160 |
Thermal Properties
| Glass Transition Temperature, °C | 70 | |
| 410 |
| Maximum Temperature: Decomposition, °C | 390 | |
| 590 |
| Maximum Temperature: Mechanical, °C | 80 | |
| 340 |
| Specific Heat Capacity, J/kg-K | 1000 to 1150 | |
| 930 |
Electrical Properties
| Dielectric Constant (Relative Permittivity) At 1 Hz | 3.7 | |
| 3.4 |
Otherwise Unclassified Properties
| Density, g/cm3 | 1.4 to 1.6 | |
| 1.3 |
| Limiting Oxygen Index (LOI), % | 21 | |
| 58 |
Common Calculations
| Stiffness to Weight: Axial, points | 1.2 to 4.4 | |
| 2.5 |
| Stiffness to Weight: Bending, points | 32 to 54 | |
| 46 |
| Strength to Weight: Axial, points | 12 to 27 | |
| 34 |
| Strength to Weight: Bending, points | 25 to 41 | |
| 50 |