Borosilicate Glass vs. Machinable Glass-ceramic
Both borosilicate glass and machinable glass-ceramic are glass and glass-ceramics. There are 24 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.
For each property being compared, the top bar is borosilicate glass and the bottom bar is machinable glass-ceramic.
Metric UnitsUS Customary Units
Mechanical Properties
| Compressive (Crushing) Strength, MPa | 2000 | |
| 310 |
| Elastic (Young's, Tensile) Modulus, GPa | 67 to 80 | |
| 67 |
| Flexural Strength, MPa | 34 to 69 | |
| 96 |
| Fracture Toughness, MPa-m1/2 | 0.8 | |
| 2.5 |
| Knoop Hardness | 510 | |
| 250 |
| Poisson's Ratio | 0.21 | |
| 0.29 |
| Tensile Strength: Ultimate (UTS), MPa | 280 | |
| 84 |
Thermal Properties
| Maximum Temperature: Mechanical, °C | 360 | |
| 760 |
| Specific Heat Capacity, J/kg-K | 830 | |
| 790 |
| Thermal Conductivity, W/m-K | 1.2 | |
| 1.2 |
| Thermal Expansion, µm/m-K | 3.3 to 5.1 | |
| 21 |
Electrical Properties
| Dielectric Constant (Relative Permittivity) At 1 Hz | 4.8 to 5.5 | |
| 6.0 |
| Dielectric Constant (Relative Permittivity) At 1 MHz | 5.4 | |
| 6.4 |
| Dielectric Strength (Breakdown Potential), kV/mm | 5.0 to 34 | |
| 27 |
| Electrical Dissipation At 1 Hz | 0.0026 to 0.018 | |
| 0.0049 |
| Electrical Dissipation At 1 MHz | 0.0017 to 0.0088 | |
| 0.0050 |
| Electrical Resistivity Order of Magnitude, 10x Ω-m | 9.0 to 12 | |
| 14 |
Otherwise Unclassified Properties
| Density, g/cm3 | 2.2 to 2.6 | |
| 2.7 |
Common Calculations
| Stiffness to Weight: Axial, points | 15 to 17 | |
| 14 |
| Stiffness to Weight: Bending, points | 55 to 61 | |
| 51 |
| Strength to Weight: Axial, points | 30 to 35 | |
| 8.8 |
| Strength to Weight: Bending, points | 36 to 43 | |
| 16 |
| Thermal Diffusivity, mm2/s | 0.54 to 0.63 | |
| 0.56 |
| Thermal Shock Resistance, points | 50 to 91 | |
| 4.3 |