Unfilled Thermoplastic PI vs. Thermoset PI
Unfilled thermoplastic PI belongs to the thermoplastics classification, while thermoset PI belongs to the thermoset plastics. There are 23 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.
For each property being compared, the top bar is unfilled thermoplastic PI and the bottom bar is thermoset PI.
Metric UnitsUS Customary Units
Mechanical Properties
| Compressive (Crushing) Strength, MPa | 240 | |
| 120 to 210 |
| Elongation at Break, % | 7.5 | |
| 2.0 to 5.9 |
| Flexural Modulus, GPa | 3.8 | |
| 3.1 to 4.8 |
| Flexural Strength, MPa | 170 | |
| 60 to 100 |
| Impact Strength: Notched Izod, J/m | 83 | |
| 21 to 43 |
| Tensile Strength: Ultimate (UTS), MPa | 110 | |
| 37 to 81 |
Thermal Properties
| Glass Transition Temperature, °C | 260 | |
| 360 |
| Heat Deflection Temperature At 1.82 MPa (264 psi), °C | 340 | |
| 370 |
| Maximum Temperature: Autoignition, °C | 600 | |
| 380 |
| Maximum Temperature: Decomposition, °C | 530 | |
| 330 |
| Maximum Temperature: Mechanical, °C | 260 | |
| 260 |
| Specific Heat Capacity, J/kg-K | 1100 | |
| 1130 |
| Thermal Conductivity, W/m-K | 0.11 | |
| 0.29 to 1.7 |
| Thermal Expansion, µm/m-K | 45 | |
| 38 to 54 |
Electrical Properties
| Dielectric Constant (Relative Permittivity) At 1 MHz | 3.2 | |
| 3.1 |
| Dielectric Strength (Breakdown Potential), kV/mm | 16 | |
| 20 |
Otherwise Unclassified Properties
| Density, g/cm3 | 1.4 | |
| 1.4 to 1.6 |
| Limiting Oxygen Index (LOI), % | 35 | |
| 40 |
| Water Absorption After 24 Hours, % | 0.7 | |
| 0.14 to 0.24 |
| Water Absorption At Saturation, % | 3.8 | |
| 3.6 |
Common Calculations
| Strength to Weight: Axial, points | 22 | |
| 6.5 to 16 |
| Strength to Weight: Bending, points | 36 | |
| 16 to 30 |
| Thermal Diffusivity, mm2/s | 0.072 | |
| 0.18 to 0.95 |