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Infrared Transmitting Glass vs. Fused Silica

Both infrared transmitting glass and fused silica are glass and glass-ceramics. There are 11 material properties with values for both materials. Properties with values for just one material (15, in this case) are not shown.

For each property being compared, the top bar is infrared transmitting glass and the bottom bar is fused silica.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 18 to 63
73
Flexural Strength, MPa 20 to 79
67
Poisson's Ratio 0.28 to 0.3
0.17

Thermal Properties

Specific Heat Capacity, J/kg-K 360 to 430
720
Thermal Conductivity, W/m-K 0.0060 to 0.23
1.4
Thermal Expansion, µm/m-K 9.0 to 17
0.5

Otherwise Unclassified Properties

Density, g/cm3 4.4 to 4.8
2.2
Refractive Index 1.8 to 2.1
1.5

Common Calculations

Stiffness to Weight: Axial, points 2.3 to 7.3
18
Stiffness to Weight: Bending, points 20 to 28
63
Thermal Diffusivity, mm2/s 0.0029 to 0.14
0.85