PEEK vs. Thermoplastic PI
Both PEEK and thermoplastic PI 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 PEEK and the bottom bar is thermoplastic PI.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 4.0 to 24 | |
| 3.7 to 20 |
| Elongation at Break, % | 1.6 to 43 | |
| 1.8 to 7.5 |
| Flexural Modulus, GPa | 3.8 to 19 | |
| 3.8 to 19 |
| Flexural Strength, MPa | 150 to 330 | |
| 170 to 330 |
| Tensile Strength: Ultimate (UTS), MPa | 97 to 200 | |
| 110 to 220 |
Thermal Properties
| Glass Transition Temperature, °C | 240 | |
| 260 |
| Maximum Temperature: Autoignition, °C | 600 | |
| 600 |
| Maximum Temperature: Decomposition, °C | 570 | |
| 530 |
| Specific Heat Capacity, J/kg-K | 1390 to 1700 | |
| 970 to 1100 |
Otherwise Unclassified Properties
| Density, g/cm3 | 1.3 to 1.5 | |
| 1.4 to 1.5 |
| Limiting Oxygen Index (LOI), % | 38 | |
| 35 |
Common Calculations
| Stiffness to Weight: Axial, points | 1.5 to 10 | |
| 1.5 to 7.9 |
| Stiffness to Weight: Bending, points | 36 to 73 | |
| 37 to 64 |
| Strength to Weight: Axial, points | 20 to 41 | |
| 22 to 42 |
| Strength to Weight: Bending, points | 36 to 55 | |
| 36 to 57 |