We’re here to help - please let us know how we can do so.Contact Us
You can now purchase our products online!Shop
KBr is the most commonly used material for commercial infrared spectroscopy. It has a relatively low refractive index which permits the design of very high quality beamsplitters. Impurities in the single crystal KBr ingots are usually caused by the atmosphere in which the ingot is grown. Although the impurity bands are weak they can cause problems because they are very narrow (-1). Since FT-IR instruments are unable to ratio these bands perfectly, it is important to use only the purest KBr material available for use in beamsplitters. In good quality KBr the level of impurity bands is less than 1% for a typical beamsplitter thickness.
Melting Point: 730 °C
Density: 2.7533 g/cm3
Solubility in H2O: 53.48 g/100 g at 20 °C
Hardness: 6 kg/mm2
Appearance: Clear crystalline
Mid-IR Transmission – 8 mm thick KBr window
Short Wavelength Limit: 48,800 cm-1 (1 mm)
Long Wavelength Limit: 345 cm-1 (2 mm), 388 cm-1 (4 mm)
KBr can be relatively easily coated with high quality, wide bandwidth beamsplitter coatings. In addition, many different coating designs exist for improving the humidity resistance of the KBr. The better protective coatings have more and stronger absorption bands. The lower absorbing coatings offer less protection.
Short and Long Wavelength Limits defined for which transmissivity is greater than 50% of stated crystal thickness.