Infrared Transmitting Glass
Infrared transmitting glass is a glass-type material. It can have a fairly high density among the glass and glass-ceramics in the database.
The properties of infrared transmitting glass include two common variations. This page shows summary ranges across both of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare infrared transmitting glass to other glass and glass-ceramics (top) and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.
Mechanical Properties
Elastic (Young's, Tensile) Modulus
18 to 63 GPa 2.6 to 9.2 x 106 psi
Flexural Strength
20 to 79 MPa 2.9 to 11 x 103 psi
Poisson's Ratio
0.28 to 0.3
Thermal Properties
Specific Heat Capacity
360 to 430 J/kg-K 0.086 to 0.1 BTU/lb-°F
Thermal Conductivity
0.0060 to 0.23 W/m-K 0.0035 to 0.13 BTU/h-ft-°F
Thermal Expansion
9.0 to 17 µm/m-K
Otherwise Unclassified Properties
Density
4.4 to 4.8 g/cm3 270 to 300 lb/ft3
Refractive Index
1.8 to 2.1
Common Calculations
Stiffness to Weight: Axial
2.3 to 7.3 points
Stiffness to Weight: Bending
20 to 28 points
Thermal Diffusivity
0.0029 to 0.14 mm2/s
Followup Questions
Further Reading
Glass: Mechanics and Technology, Eric Le Bourhis, 2007
Handbook of Optical Materials, Marvin J. Weber, 2003
Handbook of Optical Constants of Solids, Edward D. Palik (editor), 1998