PTFE vs. Potassium Bromide
PTFE and potassium bromide belong to fundamentally different material chemistries. PTFE is a polymeric material, while potassium bromide is ceramic. Therefore, their performance will be even more dissimilar than would be suggested by the difference in properties. There are 6 material properties with values for both materials. Properties with values for just one material (21, in this case) are not shown.
For each property being compared, the top bar is PTFE and the bottom bar is potassium bromide.
Metric UnitsUS Customary Units
Material Properties
| Density, g/cm3 | 2.1 to 2.3 | |
| 2.8 |
| Dielectric Constant (Relative Permittivity) At 1 MHz | 2.1 to 2.4 | |
| 4.9 |
| Electrical Dissipation At 1 MHz | 0.00017 to 0.050 | |
| 0.00020 |
| Melting Onset (Solidus), °C | 330 to 340 | |
| 730 |
| Thermal Conductivity, W/m-K | 0.24 to 0.65 | |
| 4.8 |
| Thermal Expansion, µm/m-K | 110 to 120 | |
| 39 |