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Fused Silica vs. Cadmium Telluride

Fused silica belongs to the glass and glass-ceramics classification, while cadmium telluride belongs to the non-glass optical ceramics. There are 13 material properties with values for both materials. Properties with values for just one material (13, 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 fused silica and the bottom bar is cadmium telluride.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 73
45
Knoop Hardness 570
45
Poisson's Ratio 0.17
0.41

Thermal Properties

Melting Onset (Solidus), °C 1900
1090
Specific Heat Capacity, J/kg-K 720
210
Thermal Conductivity, W/m-K 1.4
5.0
Thermal Expansion, µm/m-K 0.5
5.9

Otherwise Unclassified Properties

Density, g/cm3 2.2
5.9
Light Transmission Range, µm 0.16 to 3.5
1.0 to 25
Refractive Index 1.5
2.6

Common Calculations

Stiffness to Weight: Axial, points 18
4.3
Stiffness to Weight: Bending, points 63
20
Thermal Diffusivity, mm2/s 0.85
4.1