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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.

Metric UnitsUS Customary Units

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