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NaCl is a low cost alternative to KBr for infrared sampling. Its refractive index is very similar to KBr thereby providing good IR transmissivity. However its long wavelength cutoff is higher than KBr so depending upon crystal thickness it may limit spectral range coverage. NaCl is harder and less hygroscopic than KBr but can only be used with anhydrous solvents, glycerol or alcohols. It withstands thermal and mechanical shock fairly well. A protective coating can improve its resistance to humidity. NaCl should be stored in a desiccator or heated cabinet.
Melting Point: 414.5 °C
Density: 5.65 g/cm3
Solubility in H2O: 0.05 g/100 g at 20 °C
Hardness: 40 kg/mm2
Appearance: Clear crystalline
Mid-IR Transmission – 2 mm thick NaCl window
Mid-IR Transmission – 4 mm thick NaCl window
Short Wavelength Limit: 52,600 cm-1 (1 mm)
Long Wavelength Limit: 457 cm-1 (2 mm), 584 cm-1 (4 mm)
NaCl can be protectively coated against moisture.
Short and Long Wavelength Ranges defined for which transmissivity is greater than 50% of stated crystal thickness.