Synthetic Sapphire vs. Ferrite
Both synthetic sapphire and ferrite are oxide-based engineering ceramics. There are 18 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.
For each property being compared, the top bar is synthetic sapphire and the bottom bar is ferrite.
Metric UnitsUS Customary Units
Mechanical Properties
| Compressive (Crushing) Strength, MPa | 2700 | |
| 430 to 2000 |
| Elastic (Young's, Tensile) Modulus, GPa | 450 | |
| 120 to 140 |
| Flexural Strength, MPa | 1090 | |
| 120 to 150 |
| Fracture Toughness, MPa-m1/2 | 1.9 | |
| 1.4 to 1.5 |
| Knoop Hardness | 1860 | |
| 630 to 700 |
| Tensile Strength: Ultimate (UTS), MPa | 2470 | |
| 48 to 71 |
Thermal Properties
| Specific Heat Capacity, J/kg-K | 760 | |
| 710 to 1050 |
| Thermal Conductivity, W/m-K | 30 | |
| 3.9 to 6.3 |
| Thermal Expansion, µm/m-K | 5.3 | |
| 8.0 to 9.3 |
Electrical Properties
| Dielectric Constant (Relative Permittivity) At 1 MHz | 10 | |
| 12 to 270 |
| Electrical Resistivity Order of Magnitude, 10x Ω-m | 17 | |
| 1.0 to 1.5 |
Otherwise Unclassified Properties
| Density, g/cm3 | 4.0 | |
| 4.7 to 4.8 |
Common Calculations
| Stiffness to Weight: Axial, points | 63 | |
| 15 to 16 |
| Stiffness to Weight: Bending, points | 64 | |
| 35 to 36 |
| Strength to Weight: Axial, points | 170 | |
| 2.8 to 4.1 |
| Strength to Weight: Bending, points | 100 | |
| 6.2 to 8.0 |
| Thermal Diffusivity, mm2/s | 9.9 | |
| 0.78 to 1.9 |
| Thermal Shock Resistance, points | 74 | |
| 3.0 to 4.6 |