Borosilicate Glass vs. R30075 Cobalt
Borosilicate glass and R30075 cobalt belong to fundamentally different material chemistries. Borosilicate glass is a ceramic material, while R30075 cobalt is a metal. Therefore, their performance will be even more dissimilar than would be suggested by the difference in properties. There are 14 material properties with values for both materials. Properties with values for just one material (28, 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 R30075 cobalt.
Mechanical Properties
Elastic (Young's, Tensile) Modulus, GPa | 67 to 80 | |
210 to 250 |
Poisson's Ratio | 0.21 | |
0.29 |
Tensile Strength: Ultimate (UTS), MPa | 280 | |
780 to 1280 |
Thermal Properties
Melting Onset (Solidus), °C | 560 | |
1290 |
Specific Heat Capacity, J/kg-K | 830 | |
450 |
Thermal Conductivity, W/m-K | 1.2 | |
13 |
Thermal Expansion, µm/m-K | 3.3 to 5.1 | |
12 |
Otherwise Unclassified Properties
Density, g/cm3 | 2.2 to 2.6 | |
8.4 |
Common Calculations
Stiffness to Weight: Axial, points | 15 to 17 | |
14 to 17 |
Stiffness to Weight: Bending, points | 55 to 61 | |
24 to 25 |
Strength to Weight: Axial, points | 30 to 35 | |
26 to 42 |
Strength to Weight: Bending, points | 36 to 43 | |
22 to 31 |
Thermal Diffusivity, mm2/s | 0.54 to 0.63 | |
3.5 |
Thermal Shock Resistance, points | 50 to 91 | |
21 to 29 |