Epoxy vs. PAI
Epoxy belongs to the thermoset plastics classification, while PAI belongs to the thermoplastics. There are 18 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.
For each property being compared, the top bar is epoxy and the bottom bar is PAI.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 2.4 | |
| 4.0 to 8.3 |
| Elongation at Break, % | 4.5 | |
| 3.0 to 12 |
| Tensile Strength: Ultimate (UTS), MPa | 67 | |
| 100 to 180 |
Thermal Properties
| Glass Transition Temperature, °C | 120 | |
| 280 |
| Maximum Temperature: Autoignition, °C | 430 | |
| 530 |
| Maximum Temperature: Decomposition, °C | 430 | |
| 490 |
| Maximum Temperature: Mechanical, °C | 130 | |
| 260 |
| Specific Heat Capacity, J/kg-K | 1500 | |
| 910 to 1000 |
| Thermal Conductivity, W/m-K | 0.2 | |
| 0.26 to 0.53 |
| Thermal Expansion, µm/m-K | 100 | |
| 15 to 34 |
Otherwise Unclassified Properties
| Density, g/cm3 | 1.3 | |
| 1.4 to 1.6 |
| Limiting Oxygen Index (LOI), % | 20 | |
| 45 |
Common Calculations
| Stiffness to Weight: Axial, points | 1.0 | |
| 1.6 to 3.2 |
| Stiffness to Weight: Bending, points | 34 | |
| 38 to 47 |
| Strength to Weight: Axial, points | 14 | |
| 19 to 34 |
| Strength to Weight: Bending, points | 28 | |
| 33 to 49 |
| Thermal Diffusivity, mm2/s | 0.1 | |
| 0.16 to 0.41 |
| Thermal Shock Resistance, points | 20 | |
| 48 to 110 |