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Silver Chloride (AgCl) Optical Material

Silver chloride is a non-glass, inorganic optical material. It has a fairly low melting temperature among non-glass optical ceramics. In addition, it has a moderately high density and a moderately low thermal conductivity. The graph bars on the material properties cards below compare silver chloride 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

20 GPa 2.9 x 106 psi

Poisson's Ratio


Shear Modulus

7.0 GPa 1.0 x 106 psi

Thermal Properties

Melting Onset (Solidus)

460 °C 850 °F

Specific Heat Capacity

360 J/kg-K 0.086 BTU/lb-°F

Thermal Conductivity

1.2 W/m-K 0.66 BTU/h-ft-°F

Thermal Expansion

31 µm/m-K

Other Material Properties


5.6 g/cm3 350 lb/ft3

Dielectric Constant (Relative Permittivity) At 1 MHz


Light Transmission Range

0.4 to 25 µm

Refractive Index


Common Calculations

Stiffness to Weight: Axial

2.0 points

Stiffness to Weight: Bending

16 points

Thermal Diffusivity

0.57 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

CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015