CR Rubber vs. FEP
CR rubber belongs to the thermoset elastomers (rubber) classification, while FEP belongs to the thermoplastics. 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 CR rubber and the bottom bar is FEP.
Metric UnitsUS Customary Units
Mechanical Properties
| Elongation at Break, % | 380 | |
| 300 |
| Tensile Strength: Ultimate (UTS), MPa | 11 | |
| 20 |
Thermal Properties
| Glass Transition Temperature, °C | -45 | |
| 60 |
| Maximum Temperature: Autoignition, °C | 410 | |
| 630 |
| Maximum Temperature: Mechanical, °C | 130 | |
| 200 |
| Specific Heat Capacity, J/kg-K | 1120 | |
| 1170 |
| Thermal Conductivity, W/m-K | 0.19 | |
| 0.22 |
Otherwise Unclassified Properties
| Density, g/cm3 | 1.5 | |
| 2.1 |
| Limiting Oxygen Index (LOI), % | 26 | |
| 80 |
Common Calculations
| Strength to Weight: Axial, points | 1.9 | |
| 2.6 |
| Strength to Weight: Bending, points | 7.1 | |
| 7.6 |
| Thermal Diffusivity, mm2/s | 0.11 | |
| 0.088 |