# 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 10 ^{3} psi*

Elastic (Young's, Tensile) Modulus

18 *GPa* 2.6 *x 10 ^{6} psi*

Flexural Strength

20 *MPa* 2.9 *x 10 ^{3} psi*

Knoop Hardness

440

Poisson's Ratio

0.28

## 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

Density

4.4 *g/cm ^{3}* 270

*lb/ft*

^{3}Light Transmission Range

3.0 to 14 *µm*

Refractive Index

2.1

## Common Calculations

Stiffness to Weight: Axial

2.3 *points*

Stiffness to Weight: Bending

20 *points*

Thermal Diffusivity

0.14 *mm ^{2}/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