PBT vs. Thermoset PI
PBT belongs to the thermoplastics classification, while thermoset PI belongs to the thermoset plastics. There are 13 material properties with values for both materials. Properties with values for just one material (16, in this case) are not shown.
For each property being compared, the top bar is PBT and the bottom bar is thermoset PI.
Metric UnitsUS Customary Units
Mechanical Properties
| Elongation at Break, % | 2.5 to 43 | |
| 2.0 to 5.9 |
| Flexural Modulus, GPa | 2.6 to 9.1 | |
| 3.1 to 4.8 |
| Flexural Strength, MPa | 79 to 210 | |
| 60 to 100 |
| Tensile Strength: Ultimate (UTS), MPa | 58 to 140 | |
| 37 to 81 |
Thermal Properties
| Glass Transition Temperature, °C | 40 | |
| 360 |
| Heat Deflection Temperature At 1.82 MPa (264 psi), °C | 4.0 | |
| 370 |
| Maximum Temperature: Autoignition, °C | 380 | |
| 380 |
| Maximum Temperature: Decomposition, °C | 380 | |
| 330 |
| Specific Heat Capacity, J/kg-K | 1040 to 1200 | |
| 1130 |
Otherwise Unclassified Properties
| Density, g/cm3 | 1.3 to 1.5 | |
| 1.4 to 1.6 |
| Limiting Oxygen Index (LOI), % | 20 | |
| 40 |
Common Calculations
| Strength to Weight: Axial, points | 12 to 25 | |
| 6.5 to 16 |
| Strength to Weight: Bending, points | 25 to 38 | |
| 16 to 30 |