FTIR / Infrared Crystal
Sodium Chloride (NaCl)
Broadband infrared crystal for FTIR, CO₂ laser windows and laboratory optics
Sodium Chloride (NaCl) is a low-cost synthetic crystal with broad optical transmission from the ultraviolet into the long-wave infrared. It is widely used in FTIR spectroscopy, CO₂ laser windows and laboratory optics. NaCl is soft, cleaves readily and is highly water soluble, so it is best suited to controlled dry environments rather than exposed outdoor service.
Is this material right for your application?
Use When:
Cost-sensitive IR spectroscopy applications are required
FTIR windows or prisms are used in controlled environments
Optical clarity is more important than durability
Components are easily replaceable
Moisture exposure can be avoided
Avoid When:
Any moisture exposure is expected
Components require long service life
Mechanical durability or shock resistance is needed
Field or outdoor deployment is required
Consider Alternatives:
KBr – improved IR transmission
KCl – better handling characteristics
ZnSe – non-hygroscopic, durable IR optics
Explore Related Optical Materials
Potassium Chloride (KCl)
Potassium Bromide (KBr)
Caesium Iodide (CsI)
Material specifications and frequently asked questions
FAQ
Q1. What wavelength range does NaCl support?
A representative 2 mm NaCl specimen transmits approximately from 0.18 to 20 µm.
Q2. Is NaCl moisture-sensitive?
Yes. NaCl is highly water soluble and must be kept dry.
Q3. Where is NaCl commonly used?
Typical applications include FTIR windows and prisms, CO₂ laser windows and laboratory infrared optics.
Q4. What are common alternatives to NaCl?
KBr and CsI may be considered where a different infrared range is required.
Very moisture sensitive
Soft and easily scratched
Strictly for controlled environments