PEI vs. PPO
Both PEI and PPO are thermoplastics. There are 16 material properties with values for both materials. Properties with values for just one material (15, in this case) are not shown.
For each property being compared, the top bar is PEI and the bottom bar is PPO.
Metric UnitsUS Customary Units
Mechanical Properties
| Elongation at Break, % | 3.0 to 34 | |
| 3.5 to 28 |
| Flexural Modulus, GPa | 3.4 to 5.9 | |
| 2.5 to 8.6 |
| Flexural Strength, MPa | 140 to 210 | |
| 92 to 140 |
| Impact Strength: Notched Izod, J/m | 55 to 110 | |
| 80 to 270 |
| Tensile Strength: Ultimate (UTS), MPa | 110 to 160 | |
| 63 to 140 |
Thermal Properties
| Heat Deflection Temperature At 1.82 MPa (264 psi), °C | 200 to 210 | |
| 120 to 140 |
| Maximum Temperature: Mechanical, °C | 170 | |
| 100 to 110 |
| Specific Heat Capacity, J/kg-K | 1050 to 1220 | |
| 1020 to 1250 |
| Thermal Expansion, µm/m-K | 20 to 53 | |
| 25 to 60 |
Electrical Properties
| Dielectric Strength (Breakdown Potential), kV/mm | 30 to 33 | |
| 19 to 21 |
| Electrical Resistivity Order of Magnitude, 10x Ω-m | 14 to 15 | |
| 15 |
Otherwise Unclassified Properties
| Density, g/cm3 | 1.3 to 1.5 | |
| 1.1 to 1.4 |
| Limiting Oxygen Index (LOI), % | 47 to 50 | |
| 32 |
| Water Absorption After 24 Hours, % | 0.17 to 0.25 | |
| 0.060 to 0.070 |
Common Calculations
| Strength to Weight: Axial, points | 24 to 30 | |
| 16 to 27 |
| Strength to Weight: Bending, points | 40 to 44 | |
| 33 to 42 |