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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