PEI vs. Thermoplastic PI
Both PEI 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 PEI and the bottom bar is thermoplastic PI.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 3.4 to 5.6 | |
| 3.7 to 20 |
| Elongation at Break, % | 3.0 to 34 | |
| 1.8 to 7.5 |
| Flexural Modulus, GPa | 3.4 to 5.9 | |
| 3.8 to 19 |
| Flexural Strength, MPa | 140 to 210 | |
| 170 to 330 |
| Tensile Strength: Ultimate (UTS), MPa | 110 to 160 | |
| 110 to 220 |
Thermal Properties
| Glass Transition Temperature, °C | 210 | |
| 260 |
| Maximum Temperature: Autoignition, °C | 530 | |
| 600 |
| Maximum Temperature: Decomposition, °C | 530 | |
| 530 |
| Specific Heat Capacity, J/kg-K | 1050 to 1220 | |
| 970 to 1100 |
Otherwise Unclassified Properties
| Density, g/cm3 | 1.3 to 1.5 | |
| 1.4 to 1.5 |
| Limiting Oxygen Index (LOI), % | 47 to 50 | |
| 35 |
Common Calculations
| Stiffness to Weight: Axial, points | 1.5 to 2.1 | |
| 1.5 to 7.9 |
| Stiffness to Weight: Bending, points | 39 | |
| 37 to 64 |
| Strength to Weight: Axial, points | 24 to 30 | |
| 22 to 42 |
| Strength to Weight: Bending, points | 40 to 44 | |
| 36 to 57 |