PPO vs. Thermoset PI
PPO belongs to the thermoplastics classification, while thermoset PI belongs to the thermoset plastics. There are 16 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.
For each property being compared, the top bar is PPO and the bottom bar is thermoset PI.
Metric UnitsUS Customary Units
Mechanical Properties
| Elongation at Break, % | 3.5 to 28 | |
| 2.0 to 5.9 |
| Flexural Modulus, GPa | 2.5 to 8.6 | |
| 3.1 to 4.8 |
| Flexural Strength, MPa | 92 to 140 | |
| 60 to 100 |
| Impact Strength: Notched Izod, J/m | 80 to 270 | |
| 21 to 43 |
| Tensile Strength: Ultimate (UTS), MPa | 63 to 140 | |
| 37 to 81 |
Thermal Properties
| Heat Deflection Temperature At 1.82 MPa (264 psi), °C | 120 to 140 | |
| 370 |
| Maximum Temperature: Mechanical, °C | 100 to 110 | |
| 260 |
| Specific Heat Capacity, J/kg-K | 1020 to 1250 | |
| 1130 |
| Thermal Expansion, µm/m-K | 25 to 60 | |
| 38 to 54 |
Electrical Properties
| Dielectric Strength (Breakdown Potential), kV/mm | 19 to 21 | |
| 20 |
| Electrical Resistivity Order of Magnitude, 10x Ω-m | 15 | |
| 15 |
Otherwise Unclassified Properties
| Density, g/cm3 | 1.1 to 1.4 | |
| 1.4 to 1.6 |
| Limiting Oxygen Index (LOI), % | 32 | |
| 40 |
| Water Absorption After 24 Hours, % | 0.060 to 0.070 | |
| 0.14 to 0.24 |
Common Calculations
| Strength to Weight: Axial, points | 16 to 27 | |
| 6.5 to 16 |
| Strength to Weight: Bending, points | 33 to 42 | |
| 16 to 30 |