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Sodium Chloride (NaCl) Optical Crystals

Sodium Chloride is the most common infrared transmission crystal window for gas and liquid sample cells used with infrared and FTIR spectrophotometers. It is also useful for CO2 lasers, although KCl is normally preferable due to its lower refractive index at 10.6 microns. NaCl windows are soft and hygroscopic.

 





Optical Properties---Sodium Chloride (NaCl) Optical Crystals

Transmission Range: 0.2 to 20 microns
Refractive Index: 1.494 at 10 microns
Reflection Loss: 7.5% at 10 microns ( 2 surfaces)
dN/dT: -36.2 x 10-6/°C at 0.7 microns

Physical Properties---Sodium Chloride (NaCl) Optical Crystals

Melting Point: 801° C
Young's Modulus: 39.98 GPa
Apparent Elastic Limit: 350 psi
Structure: Cubic-(100) cleavage plane

Chemical Properties---Sodium Chloride (NaCl) Optical Crystals

Solubility: 35.7gm/100gm H2O at 0° C