PEEK vs. Low Expansion Glass-ceramic
PEEK and low expansion glass-ceramic belong to fundamentally different material chemistries. PEEK is a polymeric material, while low expansion glass-ceramic is ceramic. Therefore, their performance will be even more dissimilar than would be suggested by the difference in properties. There are 15 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 PEEK and the bottom bar is low expansion glass-ceramic.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 4.0 to 24 | |
| 83 |
| Flexural Strength, MPa | 150 to 330 | |
| 35 |
| Tensile Strength: Ultimate (UTS), MPa | 97 to 200 | |
| 53 |
Thermal Properties
| Maximum Temperature: Mechanical, °C | 330 | |
| 690 |
| Specific Heat Capacity, J/kg-K | 1390 to 1700 | |
| 800 |
| Thermal Conductivity, W/m-K | 0.25 to 0.93 | |
| 1.5 |
| Thermal Expansion, µm/m-K | 15 to 52 | |
| 1.7 |
Electrical Properties
| Electrical Resistivity Order of Magnitude, 10x Ω-m | 3.0 to 14 | |
| 11 |
Otherwise Unclassified Properties
| Density, g/cm3 | 1.3 to 1.5 | |
| 2.4 |
Common Calculations
| Stiffness to Weight: Axial, points | 1.5 to 10 | |
| 19 |
| Stiffness to Weight: Bending, points | 36 to 73 | |
| 59 |
| Strength to Weight: Axial, points | 20 to 41 | |
| 6.1 |
| Strength to Weight: Bending, points | 36 to 55 | |
| 13 |
| Thermal Diffusivity, mm2/s | 0.1 to 0.51 | |
| 0.76 |
| Thermal Shock Resistance, points | 34 to 57 | |
| 28 |