PEI vs. PAI
Both PEI and PAI 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 PEI and the bottom bar is PAI.
Metric UnitsUS Customary Units
Mechanical Properties
| Compressive (Crushing) Strength, MPa | 140 to 180 | |
| 260 to 300 |
| Elastic (Young's, Tensile) Modulus, GPa | 3.4 to 5.6 | |
| 4.0 to 8.3 |
| Elongation at Break, % | 3.0 to 34 | |
| 3.0 to 12 |
| Flexural Modulus, GPa | 3.4 to 5.9 | |
| 4.0 to 6.8 |
| Flexural Strength, MPa | 140 to 210 | |
| 160 to 320 |
| Impact Strength: Notched Izod, J/m | 55 to 110 | |
| 45 to 140 |
| Tensile Strength: Ultimate (UTS), MPa | 110 to 160 | |
| 100 to 180 |
Thermal Properties
| Glass Transition Temperature, °C | 210 | |
| 280 |
| Heat Deflection Temperature At 1.82 MPa (264 psi), °C | 200 to 210 | |
| 280 |
| Maximum Temperature: Autoignition, °C | 530 | |
| 530 |
| Maximum Temperature: Decomposition, °C | 530 | |
| 490 |
| Maximum Temperature: Mechanical, °C | 170 | |
| 260 |
| Specific Heat Capacity, J/kg-K | 1050 to 1220 | |
| 910 to 1000 |
| Thermal Conductivity, W/m-K | 0.18 to 0.23 | |
| 0.26 to 0.53 |
| Thermal Expansion, µm/m-K | 20 to 53 | |
| 15 to 34 |
Otherwise Unclassified Properties
| Density, g/cm3 | 1.3 to 1.5 | |
| 1.4 to 1.6 |
| Limiting Oxygen Index (LOI), % | 47 to 50 | |
| 45 |
| Water Absorption After 24 Hours, % | 0.17 to 0.25 | |
| 0.3 to 0.4 |
| Water Absorption At Saturation, % | 0.9 to 1.3 | |
| 1.5 to 1.7 |
Common Calculations
| Stiffness to Weight: Axial, points | 1.5 to 2.1 | |
| 1.6 to 3.2 |
| Stiffness to Weight: Bending, points | 39 | |
| 38 to 47 |
| Strength to Weight: Axial, points | 24 to 30 | |
| 19 to 34 |
| Strength to Weight: Bending, points | 40 to 44 | |
| 33 to 49 |
| Thermal Diffusivity, mm2/s | 0.11 to 0.14 | |
| 0.16 to 0.41 |
| Thermal Shock Resistance, points | 44 to 100 | |
| 48 to 110 |