PBI vs. PPA
PBI belongs to the thermoset plastics classification, while PPA belongs to the thermoplastics. There are 17 material properties with values for both materials. Properties with values for just one material (13, in this case) are not shown.
For each property being compared, the top bar is PBI and the bottom bar is PPA.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 5.9 | |
| 2.1 to 2.2 |
| Elongation at Break, % | 3.0 | |
| 30 |
| Flexural Modulus, GPa | 6.5 | |
| 2.3 to 2.4 |
| Flexural Strength, MPa | 220 | |
| 95 to 110 |
| Tensile Strength: Ultimate (UTS), MPa | 160 | |
| 57 to 69 |
Thermal Properties
| Glass Transition Temperature, °C | 410 | |
| 92 to 130 |
| Heat Deflection Temperature At 1.82 MPa (264 psi), °C | 430 | |
| 120 |
| Maximum Temperature: Decomposition, °C | 590 | |
| 450 |
| Specific Heat Capacity, J/kg-K | 930 | |
| 1400 |
| Thermal Conductivity, W/m-K | 0.41 | |
| 0.15 |
Otherwise Unclassified Properties
| Density, g/cm3 | 1.3 | |
| 1.1 |
| Water Absorption After 24 Hours, % | 0.4 | |
| 0.7 |
Common Calculations
| Stiffness to Weight: Axial, points | 2.5 | |
| 1.0 to 1.1 |
| Stiffness to Weight: Bending, points | 46 | |
| 38 |
| Strength to Weight: Axial, points | 34 | |
| 14 to 17 |
| Strength to Weight: Bending, points | 50 | |
| 29 to 33 |
| Thermal Diffusivity, mm2/s | 0.34 | |
| 0.095 |