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Borosilicate Glass vs. Cesium Bromide

Borosilicate glass belongs to the glass and glass-ceramics classification, while cesium bromide belongs to the non-glass optical ceramics. There are 13 material properties with values for both materials. Properties with values for just one material (16, in this case) are not shown.

For each property being compared, the top bar is borosilicate glass and the bottom bar is cesium bromide.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 67 to 80
16
Knoop Hardness 510
20
Poisson's Ratio 0.21
0.28

Thermal Properties

Melting Onset (Solidus), °C 560
640
Specific Heat Capacity, J/kg-K 830
270
Thermal Conductivity, W/m-K 1.2
0.9
Thermal Expansion, µm/m-K 3.3 to 5.1
48

Otherwise Unclassified Properties

Density, g/cm3 2.2 to 2.6
4.4
Light Transmission Range, µm 0.3 to 2.5
0.25 to 40
Refractive Index 1.5
1.6

Common Calculations

Stiffness to Weight: Axial, points 15 to 17
2.0
Stiffness to Weight: Bending, points 55 to 61
19
Thermal Diffusivity, mm2/s 0.54 to 0.63
0.76