Korth Kristalle GmbH

Refractive Index


Potassium Bromide (



Properties (KBr)    
Transmission Range (50% of total transmission)  0,21- 33 µm (thickness 2mm)  
Refractive Index   1,55655 @633nm  
Reflective Loss   4,34% @10 µm  
Reststrahlen   79 µm  
Density   2.7533 g/cm3  
Melting Point   730°C  
Molecular Weight   119.01 
Thermal Conductivity   4,8 W/(m·K) @323K 
Heat Capacity   435 J/(kg·K) @0°C  
Thermal Expansion   43 · 10-6/K (253...333K) 
Hardness (Mohs)   7.0 <100> (Indenter load 200g)  
Young`s Modulus   26.8 GPa  
Shear Modulus   5.08 GPa  
Bulk Modulus   15.03 GPa  
Rupture Modulus   3.3 MPa  
Elastic Coefficient   C11 = 34.5; C12 = 5.4; C44 = 5.08 GPa  
Dielectric Constant   4,9 @298K, f = 100 Hz...10 GHz  
Solubility in Water   67,8g/100g @25°C  
Crystal Structure   single crystal, synthetic  
Crystal Type  cubic, NaCl type structure, a0= 6.5966 Å 
Cleavage Planes   (100)  
Poisson Ration   0.3  
Application   IR spectroscopy, FTIR beamsplitters, Co2 laser optics, protective windows  
Remarks   coating available, max. temperature for application: 200°C, sensitive to humidity and soluble with weak alcohol  

Transmission spectrum


Transmission spectrum-2

KBr englisch

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