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Borosilicate Glass vs. Thallium Bromoiodide

Borosilicate glass belongs to the glass and glass-ceramics classification, while thallium bromoiodide belongs to the non-glass optical ceramics. There are 12 material properties with values for both materials. Properties with values for just one material (17, 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 thallium bromoiodide.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 67 to 80
31
Poisson's Ratio 0.21
0.37

Thermal Properties

Melting Onset (Solidus), °C 560
420
Specific Heat Capacity, J/kg-K 830
150
Thermal Conductivity, W/m-K 1.2
0.55
Thermal Expansion, µm/m-K 3.3 to 5.1
6.0

Otherwise Unclassified Properties

Density, g/cm3 2.2 to 2.6
7.4
Light Transmission Range, µm 0.3 to 2.5
0.6 to 40
Refractive Index 1.5
2.4

Common Calculations

Stiffness to Weight: Axial, points 15 to 17
2.3
Stiffness to Weight: Bending, points 55 to 61
14
Thermal Diffusivity, mm2/s 0.54 to 0.63
0.5