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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


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