Beryllia vs. PES
Beryllia and PES belong to fundamentally different material chemistries. Beryllia 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 18 material properties with values for both materials. Properties with values for just one material (16, in this case) are not shown. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.
For each property being compared, the top bar is beryllia and the bottom bar is PES.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 350 | |
| 2.6 |
| Flexural Strength, MPa | 240 | |
| 130 |
| Tensile Strength: Ultimate (UTS), MPa | 140 | |
| 87 |
Thermal Properties
| Maximum Temperature: Mechanical, °C | 1750 | |
| 200 |
| Specific Heat Capacity, J/kg-K | 1050 | |
| 1100 |
| Thermal Conductivity, W/m-K | 270 | |
| 0.18 |
| Thermal Expansion, µm/m-K | 8.0 | |
| 53 |
Electrical Properties
| Dielectric Constant (Relative Permittivity) At 1 MHz | 6.6 | |
| 3.5 |
| Dielectric Strength (Breakdown Potential), kV/mm | 11 | |
| 16 |
| Electrical Dissipation At 1 MHz | 0.00060 | |
| 0.0035 |
| Electrical Resistivity Order of Magnitude, 10x Ω-m | 13 | |
| 15 |
Otherwise Unclassified Properties
| Density, g/cm3 | 2.9 | |
| 1.4 |
Common Calculations
| Stiffness to Weight: Axial, points | 67 | |
| 1.1 |
| Stiffness to Weight: Bending, points | 82 | |
| 33 |
| Strength to Weight: Axial, points | 14 | |
| 18 |
| Strength to Weight: Bending, points | 21 | |
| 32 |
| Thermal Diffusivity, mm2/s | 89 | |
| 0.12 |
| Thermal Shock Resistance, points | 3.6 | |
| 45 |