Fused Silica vs. Engineering Porcelain
Fused silica belongs to the glass and glass-ceramics classification, while engineering porcelain belongs to the oxide-based engineering ceramics. There are 22 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 engineering porcelain.
Metric UnitsUS Customary Units
Mechanical Properties
| Compressive (Crushing) Strength, MPa | 1100 | |
| 590 |
| Elastic (Young's, Tensile) Modulus, GPa | 73 | |
| 67 to 150 |
| Flexural Strength, MPa | 67 | |
| 43 to 160 |
| Knoop Hardness | 570 | |
| 600 |
| Poisson's Ratio | 0.17 | |
| 0.17 |
| Shear Modulus, GPa | 31 | |
| 34 |
| Tensile Strength: Ultimate (UTS), MPa | 50 | |
| 130 |
Thermal Properties
| Maximum Temperature: Mechanical, °C | 1080 | |
| 1170 |
| Specific Heat Capacity, J/kg-K | 720 | |
| 600 to 1000 |
| Thermal Conductivity, W/m-K | 1.4 | |
| 1.8 to 6.5 |
| Thermal Expansion, µm/m-K | 0.5 | |
| 2.0 to 6.6 |
Electrical Properties
| Dielectric Constant (Relative Permittivity) At 1 MHz | 3.8 | |
| 6.5 |
| Dielectric Strength (Breakdown Potential), kV/mm | 30 | |
| 11 to 25 |
| Electrical Dissipation At 1 MHz | 0.00011 | |
| 0.00043 to 0.013 |
| Electrical Resistivity Order of Magnitude, 10x Ω-m | 14 | |
| 9.0 to 12 |
Otherwise Unclassified Properties
| Density, g/cm3 | 2.2 | |
| 2.3 to 3.0 |
Common Calculations
| Stiffness to Weight: Axial, points | 18 | |
| 16 to 29 |
| Stiffness to Weight: Bending, points | 63 | |
| 49 to 65 |
| Strength to Weight: Axial, points | 6.3 | |
| 12 to 16 |
| Strength to Weight: Bending, points | 14 | |
| 19 to 25 |
| Thermal Diffusivity, mm2/s | 0.85 | |
| 0.73 to 3.9 |
| Thermal Shock Resistance, points | 97 | |
| 11 to 53 |