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Chalcogenide Infrared Transmitting Glass

Chalcogenide glass is a grade of infrared transmitting glass. The graph bars on the material properties cards below compare chalcogenide 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

Compressive (Crushing) Strength

160 MPa 23 x 103 psi

Elastic (Young's, Tensile) Modulus

18 GPa 2.6 x 106 psi

Flexural Strength

20 MPa 2.9 x 103 psi

Knoop Hardness


Poisson's Ratio


Thermal Properties

Maximum Temperature: Mechanical

480 °C 900 °F

Specific Heat Capacity

360 J/kg-K 0.086 BTU/lb-°F

Thermal Conductivity

0.23 W/m-K 0.13 BTU/h-ft-°F

Thermal Expansion

17 µm/m-K

Otherwise Unclassified Properties


4.4 g/cm3 270 lb/ft3

Light Transmission Range

3.0 to 14 µm

Refractive Index


Common Calculations

Stiffness to Weight: Axial

2.3 points

Stiffness to Weight: Bending

20 points

Thermal Diffusivity

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