Alumina vs. Soda-lime Glass
Alumina belongs to the oxide-based engineering ceramics classification, while soda-lime glass belongs to the glass and glass-ceramics. There are 17 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 alumina and the bottom bar is soda-lime glass.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 220 to 370 | |
| 70 to 71 |
| Knoop Hardness | 960 to 1660 | |
| 570 |
| Poisson's Ratio | 0.22 to 0.24 | |
| 0.23 |
| Tensile Strength: Ultimate (UTS), MPa | 210 to 290 | |
| 41 to 180 |
Thermal Properties
| Maximum Temperature: Mechanical, °C | 650 to 1730 | |
| 300 |
| Specific Heat Capacity, J/kg-K | 870 to 940 | |
| 720 to 800 |
| Thermal Conductivity, W/m-K | 14 to 30 | |
| 1.0 to 1.1 |
| Thermal Expansion, µm/m-K | 6.7 to 8.2 | |
| 8.8 to 9.0 |
Electrical Properties
| Dielectric Constant (Relative Permittivity) At 1 MHz | 7.8 to 11 | |
| 7.3 to 7.4 |
| Dielectric Strength (Breakdown Potential), kV/mm | 8.9 to 12 | |
| 13 |
Otherwise Unclassified Properties
| Density, g/cm3 | 3.4 to 4.1 | |
| 2.4 |
Common Calculations
| Stiffness to Weight: Axial, points | 35 to 53 | |
| 16 |
| Stiffness to Weight: Bending, points | 57 to 62 | |
| 56 |
| Strength to Weight: Axial, points | 14 to 23 | |
| 4.6 to 20 |
| Strength to Weight: Bending, points | 19 to 28 | |
| 11 to 28 |
| Thermal Diffusivity, mm2/s | 3.7 to 10 | |
| 0.51 to 0.6 |
| Thermal Shock Resistance, points | 4.9 to 14 | |
| 4.7 to 20 |