Sodium Chloride – NaCl

lenses, windows, mirrors, filters and prisms


Sodium Chloride is commonly known as rock salt, it is hydroscopic and highly soluble in water. Available in large diameters for use as infrared optical windows, lenses and prisms. To maintain polished surfaces components should be stored and ideally used in a dry atmosphere.

Transmission Range 0.21 – 26.0 µ
Crystal Structure Rock Salt
Cleavage Plane 100
Colour Colourless
Density 2.164 (20°)
Melting Point (°) 801
Reflection Loss 7.5% (10µ) for 2 surfaces
Solubility index 35.8gm/100gm water / 50°C
Hardness (Knoop) 15.2(110) 18.2(100)
Thermal Conductivity (cal/cm sec°C) 1.55×10-2 (16°C)
Thermal Expansion coefficient (/°C) 44×10-6(-50 – 200°C)
Sodium Chloride (NaCl) windows and Sodium Chloride (NaCl) lenses

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