Potassium Bromide (KBr) Windows

  • Sale
  • Regular price $50.00

Potassium Bromide (KBr) is commonly used in FTIR spectroscopy and is mostly sought for its excellent transmission range from the UV to the long IR range. KBr is similar to Sodium Chloride (NaCl) but has a slightly expanded spectral range.

KBr is water soluble and must be used in a moisture-free environment as the polished surfaces will degrade in a moist atmosphere. These windows provide good resistance to mechanic shock and can be used in high temperatures (up to 300ºC).


Firebird provides these in several uncoated stock configurations but can provide customized and coated to your specifications. 

KBr Specs:

Wavelength range: 250nm-26μm Coating: Uncoated
Diameter tolerance: ±0.5mm Surface Quality: 60/40
Thickness tolerance: ±0.2mm Paralellism: <5 arc minute
Clear Aperture: 90% Density: 2.753g/cm3
Melting point: 728ºC Young's Modulus: (GPa): 26.8
Coefficient of Thermal Expansion: 43 x 10-6/°C Knoop Hardness: 7kg/mm2