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
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/cm3 270 lb/ft3
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 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