Fused Silica vs. CVD Diamond
Fused silica belongs to the glass and glass-ceramics classification, while CVD diamond belongs to the non-oxide engineering ceramics. There are 18 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.
For each property being compared, the top bar is fused silica and the bottom bar is CVD diamond.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 73 | |
| 1050 |
| Poisson's Ratio | 0.17 | |
| 0.1 |
| Tensile Strength: Ultimate (UTS), MPa | 50 | |
| 750 |
Thermal Properties
| Specific Heat Capacity, J/kg-K | 720 | |
| 500 |
| Thermal Conductivity, W/m-K | 1.4 | |
| 1900 |
| Thermal Expansion, µm/m-K | 0.5 | |
| 1.0 |
Electrical Properties
| Dielectric Constant (Relative Permittivity) At 1 MHz | 3.8 | |
| 5.7 |
| Electrical Dissipation At 1 MHz | 0.00011 | |
| 0.00020 |
| Electrical Resistivity Order of Magnitude, 10x Ω-m | 14 | |
| 13 |
Otherwise Unclassified Properties
| Density, g/cm3 | 2.2 | |
| 3.5 |
| Light Transmission Range, µm | 0.16 to 3.5 | |
| 0.22 to 100 |
| Refractive Index | 1.5 | |
| 2.4 |
Common Calculations
| Stiffness to Weight: Axial, points | 18 | |
| 170 |
| Stiffness to Weight: Bending, points | 63 | |
| 96 |
| Strength to Weight: Axial, points | 6.3 | |
| 59 |
| Strength to Weight: Bending, points | 14 | |
| 52 |
| Thermal Diffusivity, mm2/s | 0.85 | |
| 1080 |
| Thermal Shock Resistance, points | 97 | |
| 51 |