Borosilicate Glass vs. ASTM A217 Cast Steel
Borosilicate glass and ASTM A217 cast steel belong to fundamentally different material chemistries. Borosilicate glass is a ceramic material, while ASTM A217 cast steel is a metal. Therefore, their performance will be even more dissimilar than would be suggested by the difference in properties. There are 15 material properties with values for both materials. Properties with values for just one material (30, in this case) are not shown. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.
For each property being compared, the top bar is borosilicate glass and the bottom bar is ASTM A217 cast steel.
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 67 to 80 | |
| 190 |
| Poisson's Ratio | 0.21 | |
| 0.28 to 0.29 |
| Tensile Strength: Ultimate (UTS), MPa | 280 | |
| 540 to 710 |
Thermal Properties
| Maximum Temperature: Mechanical, °C | 360 | |
| 410 to 600 |
| Melting Onset (Solidus), °C | 560 | |
| 1410 to 1420 |
| Specific Heat Capacity, J/kg-K | 830 | |
| 470 |
| Thermal Conductivity, W/m-K | 1.2 | |
| 26 to 50 |
| Thermal Expansion, µm/m-K | 3.3 to 5.1 | |
| 13 |
Otherwise Unclassified Properties
| Density, g/cm3 | 2.2 to 2.6 | |
| 7.8 |
Common Calculations
| Stiffness to Weight: Axial, points | 15 to 17 | |
| 13 to 14 |
| Stiffness to Weight: Bending, points | 55 to 61 | |
| 24 to 25 |
| Strength to Weight: Axial, points | 30 to 35 | |
| 19 to 25 |
| Strength to Weight: Bending, points | 36 to 43 | |
| 19 to 23 |
| Thermal Diffusivity, mm2/s | 0.54 to 0.63 | |
| 6.9 to 14 |
| Thermal Shock Resistance, points | 50 to 91 | |
| 16 to 20 |