Potassium Chloride
- KCl
Potassium Chloride (KCl) is a widely used infrared optical material with broad transmission from 0.21–20 µm, making it ideal for FTIR spectroscopy, gas-analysis cells, mid-IR windows, and analytical instruments that require strong mid-infrared performance. Its smooth dispersion and low refractive index (~1.46 at 10 µm) provide excellent clarity for mid-IR optical systems.
KCl is a hygroscopic halide crystal, so it must be used in controlled low-humidity environments or sealed assemblies. When protected, it delivers stable, uniform transmission and is a cost-effective alternative to KBr for many spectroscopy applications.
At Global Optics UK, we manufacture and supply precision KCl windows, prisms, plates, and IR components, available uncoated or with protective moisture-resistant coatings. All optics are produced to tight surface-quality and dimensional tolerances, ensuring reliable performance in FTIR systems, gas-cell optics, environmental monitoring, and mid-IR analytical setups.
Explore Related Optical Materials:
Potassium Bromide (KBr)
Cesium Iodide (Csl)
Barium Fluoride (BaF2)
FAQ
FAQ
Q: What is Potassium Chloride (KCl) used for?
A: Potassium Chloride is widely used in FTIR spectroscopy, gas-analysis cells, environmental monitoring systems, and mid-infrared optical instruments, thanks to its broad 0.21–20 µm transmission.
Q: What makes KCl different from other infrared materials?
A: KCl offers broad mid-IR transparency, a low refractive index (~1.46), and smooth spectral behaviour. It is also a cost-effective alternative to KBr for many spectroscopy applications, though it shares similar moisture sensitivity.
Q: Is Potassium Chloride hygroscopic?
A: Yes. KCl is strongly hygroscopic, meaning it absorbs moisture readily. It must be handled in dry conditions and stored in sealed or desiccated environments to prevent clouding or surface damage.
Q: Is KCl suitable for FTIR and mid-infrared spectroscopy?
A: Yes. KCl is commonly used for FTIR windows, plates, prisms, and gas-cell optics, especially in mid-IR spectroscopy and chemical analysis systems.
Q: What optical components can be made from KCl?
A: KCl can be fabricated into windows, prisms, plates, beamsplitters, and gas-cell components, offering reliable mid-IR transmission when properly protected from moisture.
Q: How durable is Potassium Chloride?
A: KCl provides excellent optical performance but is soft, easily scratched, and moisture-sensitive. For long-term use, it is typically housed in sealed, low-humidity assemblies.
Q: Can KCl optics be anti-reflection coated?
A: Yes. KCl can be supplied with protective or anti-reflective coatings compatible with hygroscopic crystals, although sealed or desiccated assemblies are often preferred.
Q: Is KCl safe to handle?
A: Yes. KCl is non-toxic and chemically stable, but it must be kept dry. Gloves and low-humidity environments help preserve optical quality.
Q: Where can I obtain technical data for KCl?
A: Full technical specifications, datasheets, and material graphs for Potassium Chloride are available here.