PAI vs. PEI
Both PAI and PEI are thermoplastics. There are 25 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.
For each property being compared, the top bar is PAI and the bottom bar is PEI.
Metric UnitsUS Customary Units
Mechanical Properties
| Compressive (Crushing) Strength, MPa | 260 to 300 | |
| 140 to 180 |
| Elastic (Young's, Tensile) Modulus, GPa | 4.0 to 8.3 | |
| 3.4 to 5.6 |
| Elongation at Break, % | 3.0 to 12 | |
| 3.0 to 34 |
| Flexural Modulus, GPa | 4.0 to 6.8 | |
| 3.4 to 5.9 |
| Flexural Strength, MPa | 160 to 320 | |
| 140 to 210 |
| Impact Strength: Notched Izod, J/m | 45 to 140 | |
| 55 to 110 |
| Tensile Strength: Ultimate (UTS), MPa | 100 to 180 | |
| 110 to 160 |
Thermal Properties
| Glass Transition Temperature, °C | 280 | |
| 210 |
| Heat Deflection Temperature At 1.82 MPa (264 psi), °C | 280 | |
| 200 to 210 |
| Maximum Temperature: Autoignition, °C | 530 | |
| 530 |
| Maximum Temperature: Decomposition, °C | 490 | |
| 530 |
| Maximum Temperature: Mechanical, °C | 260 | |
| 170 |
| Specific Heat Capacity, J/kg-K | 910 to 1000 | |
| 1050 to 1220 |
| Thermal Conductivity, W/m-K | 0.26 to 0.53 | |
| 0.18 to 0.23 |
| Thermal Expansion, µm/m-K | 15 to 34 | |
| 20 to 53 |
Otherwise Unclassified Properties
| Density, g/cm3 | 1.4 to 1.6 | |
| 1.3 to 1.5 |
| Limiting Oxygen Index (LOI), % | 45 | |
| 47 to 50 |
| Water Absorption After 24 Hours, % | 0.3 to 0.4 | |
| 0.17 to 0.25 |
| Water Absorption At Saturation, % | 1.5 to 1.7 | |
| 0.9 to 1.3 |
Common Calculations
| Stiffness to Weight: Axial, points | 1.6 to 3.2 | |
| 1.5 to 2.1 |
| Stiffness to Weight: Bending, points | 38 to 47 | |
| 39 |
| Strength to Weight: Axial, points | 19 to 34 | |
| 24 to 30 |
| Strength to Weight: Bending, points | 33 to 49 | |
| 40 to 44 |
| Thermal Diffusivity, mm2/s | 0.16 to 0.41 | |
| 0.11 to 0.14 |
| Thermal Shock Resistance, points | 48 to 110 | |
| 44 to 100 |