CR Rubber vs. PEI
CR rubber belongs to the thermoset elastomers (rubber) classification, while PEI belongs to the thermoplastics. There are 13 material properties with values for both materials. Properties with values for just one material (16, in this case) are not shown.
For each property being compared, the top bar is CR rubber and the bottom bar is PEI.
Metric UnitsUS Customary Units
Mechanical Properties
| Elongation at Break, % | 380 | |
| 3.0 to 34 |
| Tensile Strength: Ultimate (UTS), MPa | 11 | |
| 110 to 160 |
Thermal Properties
| Glass Transition Temperature, °C | -45 | |
| 210 |
| Maximum Temperature: Autoignition, °C | 410 | |
| 530 |
| Maximum Temperature: Decomposition, °C | 350 | |
| 530 |
| Maximum Temperature: Mechanical, °C | 130 | |
| 170 |
| Specific Heat Capacity, J/kg-K | 1120 | |
| 1050 to 1220 |
| Thermal Conductivity, W/m-K | 0.19 | |
| 0.18 to 0.23 |
Otherwise Unclassified Properties
| Density, g/cm3 | 1.5 | |
| 1.3 to 1.5 |
| Limiting Oxygen Index (LOI), % | 26 | |
| 47 to 50 |
Common Calculations
| Strength to Weight: Axial, points | 1.9 | |
| 24 to 30 |
| Strength to Weight: Bending, points | 7.1 | |
| 40 to 44 |
| Thermal Diffusivity, mm2/s | 0.11 | |
| 0.11 to 0.14 |