Fused Silica vs. Hexagonal Boron Nitride
Fused silica belongs to the glass and glass-ceramics classification, while hexagonal boron nitride belongs to the non-oxide engineering ceramics. There are 16 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.
For each property being compared, the top bar is fused silica and the bottom bar is hexagonal boron nitride.
Metric UnitsUS Customary Units
Mechanical Properties
| Compressive (Crushing) Strength, MPa | 1100 | |
| 21 to 250 |
| Elastic (Young's, Tensile) Modulus, GPa | 73 | |
| 14 to 60 |
| Flexural Strength, MPa | 67 | |
| 18 to 140 |
| Poisson's Ratio | 0.17 | |
| 0.11 |
Thermal Properties
| Maximum Temperature: Mechanical, °C | 1080 | |
| 1030 to 2350 |
| Specific Heat Capacity, J/kg-K | 720 | |
| 840 to 1610 |
| Thermal Conductivity, W/m-K | 1.4 | |
| 29 to 96 |
| Thermal Expansion, µm/m-K | 0.5 | |
| 0.54 to 18 |
Electrical Properties
| Dielectric Constant (Relative Permittivity) At 1 MHz | 3.8 | |
| 4.0 to 4.4 |
| Dielectric Strength (Breakdown Potential), kV/mm | 30 | |
| 61 to 200 |
| Electrical Dissipation At 1 MHz | 0.00011 | |
| 0.00075 to 0.0018 |
| Electrical Resistivity Order of Magnitude, 10x Ω-m | 14 | |
| 13 to 15 |
Otherwise Unclassified Properties
| Density, g/cm3 | 2.2 | |
| 1.9 to 2.1 |
Common Calculations
| Stiffness to Weight: Axial, points | 18 | |
| 4.1 to 18 |
| Stiffness to Weight: Bending, points | 63 | |
| 42 to 69 |
| Thermal Diffusivity, mm2/s | 0.85 | |
| 9.9 to 34 |