Thermoplastic PI vs. PEEK
Both thermoplastic PI and PEEK are thermoplastics. There are 15 material properties with values for both materials. Properties with values for just one material (14, in this case) are not shown.
For each property being compared, the top bar is thermoplastic PI and the bottom bar is PEEK.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 3.7 to 20 | |
| 4.0 to 24 |
| Elongation at Break, % | 1.8 to 7.5 | |
| 1.6 to 43 |
| Flexural Modulus, GPa | 3.8 to 19 | |
| 3.8 to 19 |
| Flexural Strength, MPa | 170 to 330 | |
| 150 to 330 |
| Tensile Strength: Ultimate (UTS), MPa | 110 to 220 | |
| 97 to 200 |
Thermal Properties
| Glass Transition Temperature, °C | 260 | |
| 240 |
| Maximum Temperature: Autoignition, °C | 600 | |
| 600 |
| Maximum Temperature: Decomposition, °C | 530 | |
| 570 |
| Specific Heat Capacity, J/kg-K | 970 to 1100 | |
| 1390 to 1700 |
Otherwise Unclassified Properties
| Density, g/cm3 | 1.4 to 1.5 | |
| 1.3 to 1.5 |
| Limiting Oxygen Index (LOI), % | 35 | |
| 38 |
Common Calculations
| Stiffness to Weight: Axial, points | 1.5 to 7.9 | |
| 1.5 to 10 |
| Stiffness to Weight: Bending, points | 37 to 64 | |
| 36 to 73 |
| Strength to Weight: Axial, points | 22 to 42 | |
| 20 to 41 |
| Strength to Weight: Bending, points | 36 to 57 | |
| 36 to 55 |