Potassium bromide (KBr) is characterized by high transparency in the wavelength range between 0.25 µm and 26 µm. It can be used at temperatures above 300 °C and shows no optical absorption in the areas of high transmission. Potassium chloride is hygroscopic and highly soluble in water. For these reasons, it must be stored in a dry environment or protected from moisture by a special protective coating. Its chemical, optical and mechanical properties make potassium bromide a useful material for IR spectroscopy components and beam splitters for CO2 lasers.