PTFE vs. Thermoset PI
PTFE 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 PTFE and the bottom bar is thermoset PI.
Metric UnitsUS Customary Units
Mechanical Properties
| Compressive (Crushing) Strength, MPa | 6.9 to 24 | |
| 120 to 210 |
| Elongation at Break, % | 75 to 300 | |
| 2.0 to 5.9 |
| Flexural Modulus, GPa | 0.4 to 1.3 | |
| 3.1 to 4.8 |
| Flexural Strength, MPa | 13 to 50 | |
| 60 to 100 |
| Tensile Strength: Ultimate (UTS), MPa | 13 to 25 | |
| 37 to 81 |
Thermal Properties
| Heat Deflection Temperature At 1.82 MPa (264 psi), °C | 66 to 70 | |
| 370 |
| Maximum Temperature: Mechanical, °C | 260 to 270 | |
| 260 |
| Thermal Conductivity, W/m-K | 0.24 to 0.65 | |
| 0.29 to 1.7 |
| Thermal Expansion, µm/m-K | 110 to 120 | |
| 38 to 54 |
Electrical Properties
| Dielectric Constant (Relative Permittivity) At 1 MHz | 2.1 to 2.4 | |
| 3.1 |
| Electrical Resistivity Order of Magnitude, 10x Ω-m | 2.0 to 18 | |
| 15 |
Otherwise Unclassified Properties
| Density, g/cm3 | 2.1 to 2.3 | |
| 1.4 to 1.6 |
| Limiting Oxygen Index (LOI), % | 90 | |
| 40 |
| Water Absorption After 24 Hours, % | 0.0093 to 0.050 | |
| 0.14 to 0.24 |
Common Calculations
| Strength to Weight: Axial, points | 1.7 to 3.2 | |
| 6.5 to 16 |
| Strength to Weight: Bending, points | 5.7 to 8.7 | |
| 16 to 30 |