PTFE vs. Steatite
PTFE and steatite belong to fundamentally different material chemistries. PTFE is a polymeric material, while steatite is ceramic. Therefore, their performance will be even more dissimilar than would be suggested by the difference in properties. There are 12 material properties with values for both materials. Properties with values for just one material (17, in this case) are not shown.
For each property being compared, the top bar is PTFE and the bottom bar is steatite.
Metric UnitsUS Customary Units
Mechanical Properties
| Compressive (Crushing) Strength, MPa | 6.9 to 24 | |
| 540 to 620 |
| Flexural Strength, MPa | 13 to 50 | |
| 32 to 150 |
| Tensile Strength: Ultimate (UTS), MPa | 13 to 25 | |
| 60 to 220 |
Thermal Properties
| Maximum Temperature: Mechanical, °C | 260 to 270 | |
| 750 to 1230 |
| Thermal Conductivity, W/m-K | 0.24 to 0.65 | |
| 1.8 to 2.5 |
| Thermal Expansion, µm/m-K | 110 to 120 | |
| 7.0 to 9.0 |
Electrical Properties
| Dielectric Constant (Relative Permittivity) At 1 MHz | 2.1 to 2.4 | |
| 5.7 to 6.5 |
| Electrical Dissipation At 1 MHz | 0.00017 to 0.050 | |
| 0.0010 to 0.0060 |
| Electrical Resistivity Order of Magnitude, 10x Ω-m | 2.0 to 18 | |
| 8.0 to 11 |
Otherwise Unclassified Properties
| Density, g/cm3 | 2.1 to 2.3 | |
| 1.9 to 2.8 |
Common Calculations
| Strength to Weight: Axial, points | 1.7 to 3.2 | |
| 6.4 to 32 |
| Strength to Weight: Bending, points | 5.7 to 8.7 | |
| 13 to 42 |