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Borosilicate Glass vs. ASTM B631 Class A

Borosilicate glass and ASTM B631 class A belong to fundamentally different material chemistries. Borosilicate glass is a ceramic material, while ASTM B631 class A is a metal. Therefore, their performance will be even more dissimilar than would be suggested by the difference in properties. There are 9 material properties with values for both materials. Properties with values for just one material (27, 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 B631 class A.

Metric UnitsUS Customary Units

Material Properties

Density, g/cm3 2.2 to 2.6
15
Elastic (Young's, Tensile) Modulus, GPa 67 to 80
220
Poisson's Ratio 0.21
0.3
Specific Heat Capacity, J/kg-K 830
160
Stiffness to Weight: Axial, points 15 to 17
8.5
Stiffness to Weight: Bending, points 55 to 61
14
Thermal Conductivity, W/m-K 1.2
420
Thermal Diffusivity, mm2/s 0.54 to 0.63
180
Thermal Expansion, µm/m-K 3.3 to 5.1
11