Menu (ESC)

Zinc Selenide (ZnSe) Optical Material

Zinc selenide is a non-glass, inorganic optical material. It has a moderately high melting temperature and a moderately high thermal conductivity among non-glass optical ceramics. The graph bars on the material properties cards below compare zinc selenide to other non-glass optical 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

69 GPa 10 x 106 psi

Poisson's Ratio


Thermal Properties

Melting Onset (Solidus)

1520 °C 2770 °F

Specific Heat Capacity

340 J/kg-K 0.081 BTU/lb-°F

Thermal Conductivity

17 W/m-K 9.8 BTU/h-ft-°F

Thermal Expansion

7.3 µm/m-K

Otherwise Unclassified Properties


5.3 g/cm3 330 lb/ft3

Light Transmission Range

0.6 to 21 µm

Refractive Index


Common Calculations

Stiffness to Weight: Axial

7.3 points

Stiffness to Weight: Bending

26 points

Thermal Diffusivity

9.5 mm2/s

Followup Questions

Further Reading

Handbook of Optical Materials, Marvin J. Weber, 2003

Handbook of Optical Constants of Solids, Edward D. Palik (editor), 1998