COC vs. PEI
Both COC and PEI are 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 COC and the bottom bar is PEI.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 3.0 | |
| 3.4 to 5.6 |
| Elongation at Break, % | 2.5 | |
| 3.0 to 34 |
| Tensile Strength: Ultimate (UTS), MPa | 60 | |
| 110 to 160 |
Thermal Properties
| Thermal Expansion, µm/m-K | 60 | |
| 20 to 53 |
Electrical Properties
| Electrical Resistivity Order of Magnitude, 10x Ω-m | 14 | |
| 14 to 15 |
Otherwise Unclassified Properties
| Density, g/cm3 | 1.0 | |
| 1.3 to 1.5 |
| Water Absorption After 24 Hours, % | 0 | |
| 0.17 to 0.25 |
Common Calculations
| Stiffness to Weight: Axial, points | 1.7 | |
| 1.5 to 2.1 |
| Stiffness to Weight: Bending, points | 48 | |
| 39 |
| Strength to Weight: Axial, points | 17 | |
| 24 to 30 |
| Strength to Weight: Bending, points | 34 | |
| 40 to 44 |
| Thermal Shock Resistance, points | 24 | |
| 44 to 100 |