Potassium Chloride – KCL2

lenses, windows, mirrors, filters and prisms


Because of its low absorption, high damage threshold and low index KC1 is used a laser protection windows. Potassium Chloride is also used in infrared Spectroscopy as windows, lenses and prisms. The material is water soluble and polished surfaces should be protected from exposure to moisture.

Transmission Range 0.21 – 20.0 µ
Crystal Structure Rock Salt
Cleavage Plane 100
Colour colourless
Density 1.9865 (28°)
Melting Point (°) 776
Reflection Loss 6.8% (10µ) for 2 surfaces
Solubility index 34.7gm/100gm / 20°C
Hardness (Knoop) 7.2(110) 9.3(100)
Thermal Conductivity (cal/cm sec°C) 1.56×10-2 (42°C)
Thermal Expansion coefficient (/°C) 36×10-6(20-60°C)


Potassium Chloride windows and Potassium Chloride lenses

Download a PDF of this page
Whilst every effort has been made to verify all data provided, no responsibility can be accepted for its accuracy.