Silicone Plastic vs. PEEK
Silicone plastic belongs to the thermoset plastics classification, while PEEK belongs to the thermoplastics. There are 15 material properties with values for both materials. Properties with values for just one material (15, in this case) are not shown.
For each property being compared, the top bar is silicone plastic and the bottom bar is PEEK.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 9.0 | |
| 4.0 to 24 |
| Tensile Strength: Ultimate (UTS), MPa | 38 | |
| 97 to 200 |
Thermal Properties
| Glass Transition Temperature, °C | 200 | |
| 240 |
| Maximum Temperature: Decomposition, °C | 480 | |
| 570 |
| Specific Heat Capacity, J/kg-K | 850 | |
| 1390 to 1700 |
| Thermal Conductivity, W/m-K | 0.35 | |
| 0.25 to 0.93 |
| Thermal Expansion, µm/m-K | 35 | |
| 15 to 52 |
Electrical Properties
| Electrical Resistivity Order of Magnitude, 10x Ω-m | 12 | |
| 3.0 to 14 |
Otherwise Unclassified Properties
| Density, g/cm3 | 1.9 | |
| 1.3 to 1.5 |
Common Calculations
| Stiffness to Weight: Axial, points | 2.6 | |
| 1.5 to 10 |
| Stiffness to Weight: Bending, points | 36 | |
| 36 to 73 |
| Strength to Weight: Axial, points | 5.5 | |
| 20 to 41 |
| Strength to Weight: Bending, points | 13 | |
| 36 to 55 |
| Thermal Diffusivity, mm2/s | 0.22 | |
| 0.1 to 0.51 |
| Thermal Shock Resistance, points | 8.5 | |
| 34 to 57 |