Silver
Chloride (AgCl) is commonly used for infrared transmission
windows in gas and
liquid sample cells used with infrared and FTIR spectrophotometers
in place of Potassium Bromide (KBr) with aqueous samples
that would attack KBr optics. It has a wide transmission range and is relatively
insoluble in water, but it darkens when exposed to light.

Optical
Properties-- Silver Chloride (AgCl) Optical Crystals
Transmission
Range: 400 nm to 30µm
Refractive
Index: 1.978 at
10.6µm
Reflection
Loss: 19.5% at 10µm ( 2 surfaces)
Physical
Properties-- Silver Chloride (AgCl) Optical Crystals
Melting
Point: 457° C
Young's
Modulus: 19.98 GPa
Apparent
Elastic Limit: 3800 psi
Structure:
Cubic, no cleavage, cold flows
Chemical
Properties - Silver Chloride (AgCl) Optical Crystals
Solubility:
0.52x10-3gm/100gm H2O
at 50° C