Potassium Bromide – KBr

lenses, windows, mirrors, filters and prisms

Potassium Bromide is used widely as infrared optical windows and components for general spectroscopy because of its wide spectral range. Also used as infrared beamsplitters or interferometers substrates. KBr is water soluble and polished surfaces should be protected against moisture attack.

Transmission Range 0.23 – 25.0 µ
Crystal Structure Rock Salt
Cleavage Plane 100
Colour colourless
Density 2.75 (23°)
Melting Point (°) 730
Reflection Loss 8.4% (10µ) for 2 surfaces
Solubility index 65.2gm/100gm / 20°C/TD>
Hardness (Knoop) 5.9(110) 7.0(100)
Thermal Conductivity (cal/cm sec°C) 1.15×10-2 (46°C)
Thermal Expansion coefficient (/°C) 43×10-6(20 – 60°C)


Potassium Bromide (KBr) windows and Potassium Bromide (KBr) lenses

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