Machinable Glass-ceramic vs. PES
Machinable glass-ceramic and PES belong to fundamentally different material chemistries. Machinable glass-ceramic is a ceramic material, while PES is polymeric. Therefore, their performance will be even more dissimilar than would be suggested by the difference in properties. There are 20 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 machinable glass-ceramic and the bottom bar is PES.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 67 | |
| 2.6 |
| Flexural Strength, MPa | 96 | |
| 130 |
| Tensile Strength: Ultimate (UTS), MPa | 84 | |
| 87 |
Thermal Properties
| Maximum Temperature: Mechanical, °C | 760 | |
| 200 |
| Specific Heat Capacity, J/kg-K | 790 | |
| 1100 |
| Thermal Conductivity, W/m-K | 1.2 | |
| 0.18 |
| Thermal Expansion, µm/m-K | 21 | |
| 53 |
Electrical Properties
| Dielectric Constant (Relative Permittivity) At 1 Hz | 6.0 | |
| 3.5 |
| Dielectric Constant (Relative Permittivity) At 1 MHz | 6.4 | |
| 3.5 |
| Dielectric Strength (Breakdown Potential), kV/mm | 27 | |
| 16 |
| Electrical Dissipation At 1 Hz | 0.0049 | |
| 0.0010 |
| Electrical Dissipation At 1 MHz | 0.0050 | |
| 0.0035 |
| Electrical Resistivity Order of Magnitude, 10x Ω-m | 14 | |
| 15 |
Otherwise Unclassified Properties
| Density, g/cm3 | 2.7 | |
| 1.4 |
Common Calculations
| Stiffness to Weight: Axial, points | 14 | |
| 1.1 |
| Stiffness to Weight: Bending, points | 51 | |
| 33 |
| Strength to Weight: Axial, points | 8.8 | |
| 18 |
| Strength to Weight: Bending, points | 16 | |
| 32 |
| Thermal Diffusivity, mm2/s | 0.56 | |
| 0.12 |
| Thermal Shock Resistance, points | 4.3 | |
| 45 |