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Soda-lime Glass vs. Thallium Bromoiodide

Soda-lime 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 (9, 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 soda-lime glass and the bottom bar is thallium bromoiodide.

Soda-Lime (Float) GlassThallium Bromoiodide (KRS-5) Optical Material
Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 70 to 71
31
Poisson's Ratio 0.23
0.37
Shear Modulus, GPa 29
12

Thermal Properties

Specific Heat Capacity, J/kg-K 720 to 800
150
Thermal Conductivity, W/m-K 1.0 to 1.1
0.55
Thermal Expansion, µm/m-K 8.8 to 9.0
6.0

Otherwise Unclassified Properties

Density, g/cm3 2.4
7.4
Light Transmission Range, µm 0.35 to 2.5
0.6 to 40
Refractive Index 1.5
2.4

Common Calculations

Stiffness to Weight: Axial, points 16
2.3
Stiffness to Weight: Bending, points 56
14
Thermal Diffusivity, mm2/s 0.51 to 0.6
0.5