FEP vs. CR Rubber
FEP belongs to the thermoplastics classification, while CR rubber belongs to the thermoset elastomers (rubber). There are 12 material properties with values for both materials. Properties with values for just one material (19, in this case) are not shown.
For each property being compared, the top bar is FEP and the bottom bar is CR rubber.
Metric UnitsUS Customary Units
Mechanical Properties
| Elongation at Break, % | 300 | |
| 380 |
| Tensile Strength: Ultimate (UTS), MPa | 20 | |
| 11 |
Thermal Properties
| Glass Transition Temperature, °C | 60 | |
| -45 |
| Maximum Temperature: Autoignition, °C | 630 | |
| 410 |
| Maximum Temperature: Mechanical, °C | 200 | |
| 130 |
| Specific Heat Capacity, J/kg-K | 1170 | |
| 1120 |
| Thermal Conductivity, W/m-K | 0.22 | |
| 0.19 |
Otherwise Unclassified Properties
| Density, g/cm3 | 2.1 | |
| 1.5 |
| Limiting Oxygen Index (LOI), % | 80 | |
| 26 |
Common Calculations
| Strength to Weight: Axial, points | 2.6 | |
| 1.9 |
| Strength to Weight: Bending, points | 7.6 | |
| 7.1 |
| Thermal Diffusivity, mm2/s | 0.088 | |
| 0.11 |