PES vs. Fused Silica
PES and fused silica belong to fundamentally different material chemistries. PES is a polymeric material, while fused silica is ceramic. Therefore, their performance will be even more dissimilar than would be suggested by the difference in properties. There are 19 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 PES and the bottom bar is fused silica.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 2.6 | |
| 73 |
| Flexural Strength, MPa | 130 | |
| 67 |
| Tensile Strength: Ultimate (UTS), MPa | 87 | |
| 50 |
Thermal Properties
| Maximum Temperature: Decomposition, °C | 540 | |
| 1100 |
| Maximum Temperature: Mechanical, °C | 200 | |
| 1080 |
| Specific Heat Capacity, J/kg-K | 1100 | |
| 720 |
| Thermal Conductivity, W/m-K | 0.18 | |
| 1.4 |
| Thermal Expansion, µm/m-K | 53 | |
| 0.5 |
Electrical Properties
| Dielectric Constant (Relative Permittivity) At 1 MHz | 3.5 | |
| 3.8 |
| Dielectric Strength (Breakdown Potential), kV/mm | 16 | |
| 30 |
| Electrical Dissipation At 1 MHz | 0.0035 | |
| 0.00011 |
| Electrical Resistivity Order of Magnitude, 10x Ω-m | 15 | |
| 14 |
Otherwise Unclassified Properties
| Density, g/cm3 | 1.4 | |
| 2.2 |
Common Calculations
| Stiffness to Weight: Axial, points | 1.1 | |
| 18 |
| Stiffness to Weight: Bending, points | 33 | |
| 63 |
| Strength to Weight: Axial, points | 18 | |
| 6.3 |
| Strength to Weight: Bending, points | 32 | |
| 14 |
| Thermal Diffusivity, mm2/s | 0.12 | |
| 0.85 |
| Thermal Shock Resistance, points | 45 | |
| 97 |