Low Expansion Glass-ceramic vs. SiAlON
Low expansion glass-ceramic belongs to the glass and glass-ceramics classification, while SiAlON belongs to the non-oxide 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 low expansion glass-ceramic and the bottom bar is SiAlON.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 83 | |
| 290 |
| Flexural Strength, MPa | 35 | |
| 680 |
| Knoop Hardness | 530 | |
| 1700 |
| Poisson's Ratio | 0.22 | |
| 0.23 |
| Tensile Strength: Ultimate (UTS), MPa | 53 | |
| 190 |
Thermal Properties
| Maximum Temperature: Mechanical, °C | 690 | |
| 1200 |
| Specific Heat Capacity, J/kg-K | 800 | |
| 880 |
| Thermal Conductivity, W/m-K | 1.5 | |
| 19 |
| Thermal Expansion, µm/m-K | 1.7 | |
| 3.6 |
Electrical Properties
| Dielectric Constant (Relative Permittivity) At 1 MHz | 5.7 | |
| 9.3 |
| Electrical Resistivity Order of Magnitude, 10x Ω-m | 11 | |
| 14 |
Otherwise Unclassified Properties
| Density, g/cm3 | 2.4 | |
| 3.3 |
Common Calculations
| Stiffness to Weight: Axial, points | 19 | |
| 50 |
| Stiffness to Weight: Bending, points | 59 | |
| 67 |
| Strength to Weight: Axial, points | 6.1 | |
| 16 |
| Strength to Weight: Bending, points | 13 | |
| 22 |
| Thermal Diffusivity, mm2/s | 0.76 | |
| 6.4 |
| Thermal Shock Resistance, points | 28 | |
| 13 |