Potassium Chloride (KCl)
Broad IR-transmitting crystal with lower hygroscopicity than KBr
Infrared Optical Crystal
Potassium Chloride is an infrared-transmitting optical crystal offering slightly improved mechanical durability compared to KBr. It is commonly used in FTIR windows and prisms where moderate IR performance is required under dry conditions. KCl remains hygroscopic and unsuitable for humid or exposed environments.
Is this material right for your application?
Use When:
Avoid When:
Consider Alternatives:
Infrared transmission is required with slightly better durability than KBr
FTIR windows or prisms are used
Mechanical handling requirements are moderate
Laboratory conditions are dry
A balance between performance and cost is needed
High humidity or moisture exposure is unavoidable
Mechanical robustness is critical
Extended outdoor operation is required
Potassium Bromide (KBr) – broader IR transmission
Sodium Chloride (NaCl) – cost-effective IR spectroscopy
ZnSe – durable IR windows for exposed systems
Key Properties
Optical
Good infrared transmission
Slightly narrower range than KBr
Mechanical
Improved strength over KBr
Moderate hardness
Environmental
Hygroscopic
Requires dry conditions
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Frequently asked questions about Barium Fluoride specifications and use-cases
FAQ
Q1. What wavelength range does KCl support?
KCl transmits from ~200 nm to ~20 µm.
Q2. Is KCl hygroscopic?
Yes. KCl requires moisture protection.
Q3. Where is KCl commonly used?
IR spectroscopy windows in controlled environments.
Q4. What are common alternatives to KCl?
KBr and NaCl.
Softer than oxide glasses
Limited industrial durability
Suitable for dry environments only