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Potassium Chloride (KCl)

♦ Potassium Chloride (KCl) Data Sheet    ♦ Potassium Chloride (KCl) MSDS

Potassium Chloride is mainly used for CO2 laser protection windows as an inexpensive disposable material with a low refractive index.

Transmission Range : 0.21 to 20 μm
Refractive Index : 1.45644 at 10 μm (2)
Reflection Loss : 6.7% at 10 μm
Absorption Coefficient : 6.5 x 10-3 cm-1 at 10.6 μm @ 300K (6)
Reststrahlen Peak : 63.1 μm
dn/dT : -33.2 x 10-6 /°C (1)
dn/dμ = 0 : n/a
Density : 1.99 g/cc
Melting Point : 776°C
Thermal Conductivity : 6.53 W m-1 K-1 at 322K (3)
Thermal Expansion : 36 X 10-6 /k at 300k
Hardness : Knoop 7.2 <110>, 9.3 <100> with 200g (4)
Specific Heat Capacity : 690 J Kg-1 K-1
Dielectric Constant : 4.64 at 1MHz at 300K
Youngs Modulus (E) : 29.67 GPa (4)
Shear Modulus (G) : 6.24 GPa (4)
Bulk Modulus (K) : 17.36 GPa (4)
Elastic Coefficients : C11=39.8; C12=6.2; C44=6.25 (5)
Rupture Modulus : 4.4 MPa (635 psi) (4)
Poisson Ratio : 0.216
Solubility : 34.7g/100g water
Molecular Weight : 74.55
Class/Structure : Cubic FCC, NaCl, Fm3m, (100) cleavage

 

To download this data or our MSDS safety data sheet as a pdf, please click on the links at the top of the page.  To expand the transmission graphs, please click on the image.


µm   Noµm   Noµm   No
0.185    1.8271 0.200    1.7187 0.251    1.5897
0.308    1.54136 0.410    1.50907 0.509    1.4962
0.671    1.48669 0.883    1.48142 0.982    1.4800
1.179    1.47831 2.357    1.47475 2.947    1.47383
3.536    1.47305 4.715    1.47112 5.000    1.47048
6.000    1.46842 7.000    1.466 8.000    1.4629
9.000    1.46002 10.00    1.45644 11.00    1.45244
12.00    1.44801 13.00    1.44313 14.00    1.43779
15.00    1.43197 16.00    1.42563 17.00    1.41877
18.00    1.41134 19.00    1.40333 20.00    1.39469
21.00    1.38538 22.00    1.37537 23.00    1.36461
24.00    1.35303 25.00    1.34059 26.00    1.32721
27.00    1.31281 28.00    1.29731

Potassium Chloride is produced in large ingots by the Kyropoulos growth method. Potassium Chloride cleaves easily. With care Potassium Chloride can be polished to a high standard under humidity controlled conditions.

REFERENCES:
(1) Mentzel; Z. Physik. V 88, p178. 1934
(2) H.H.Li; RI of Alkali Halides. J. Phys and Chem Reference Data V5(2), p421, 1976
(3) Ballard, McCarthy & Davis; Rev. Sci. Insts, V21, p905, 1970
(4) Combes, et.al.; J.Opt. Soc. Am. V41, p215, 1951.
(5) Galt; Phys.Rev. V36, p1460, 1948
(6) H.H.Li, Absorption Coefficients, Int.J.Therm, V1, No. I, 1980