Korth Kristalle GmbH

Refractive Index


Potassium Chloride (



Properties (KCl)    
Transmission Range (50% of total transmission)   0,18 - 25 µm (thickness 2mm)  
Refractive Index   1,488099 @633nm  
Reflective Loss   3,45% @10 µm  
Reststrahlen   63.1 µm  
Density   1.989 g/cm3 
Melting Point   776°C  
Molecular Weight   74.55 
Thermal_Conductivity   6,53 W/(m·K) @322K 
Heat Capacity   693,26 J/(kg·K) 
Thermal Expansion   36 · 10-6/ K (253...333K)  
Hardness (Mohs)   9.3 <100> (indenter load 200g)  
Young`s Modulus   29,63 GPa 
Shear Modulus   6.24 GPa 
Bulk Modulus   17.36 GPa 
Rupture Modulus   4.4 MPa 
Elastic Coefficient   C11 = 40.2; C12 = 6.7; C44 = 6.29 GPa 
Dielectric Constant   4.64 @25°C, f = 1 MHz  
Solubility in Water   34.7g/ 100g @20°C  
Crystal Structure   single crystal, synthetic 
Crystal Type  cubic, NaCl type structure, a0= 6.29 Å
Cleavage Planes   (100) 
Poisson Ratio   0.29 
Application   IR spectroscopy, windows for Co2 laser, protection windows for cutting lenses 
Remarks   coating available, high laser radiation resitance, max. temperature for application 400°C, sensitive in combination with humidity and weak alcohol (but less than KBr)  

Transmission spectrum


Transmission spectrum-2

Kcl englisch.JPG

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