Almaz Optics, Inc.
12 Chadsford Ct.  Marlton, NJ 08053, USA
Tel:  856 797-0491, Fax: 856 797-0228
e-mail: mail@almazoptics.com

 

SODIUM CHLORIDE NaCl

Sodium Chloride is used for windows, lenses and prisms where transmission in the 0.25 µm - 16 µm range is desired. Because of its low absorption, Sodium Chloride is being used in high power laser systems. Polished surfaces must be protected from moisture by exposing them to only dry atmosphere or by using a heating element to keep the surfaces above ambient temperature. Sodium Chloride can be used at temperatures up to 400 °C. The material is sensitive to thermal shock. Irradiation generates color centers. Maximum available size: 140 mm Dia x 50 mm Thk.

Main Properties

Chemical Formula

NaCl

Crystal Class

Cubic

Lattice Constant, Å

5.65
Molecular Weight 58.45

Density, g/cm3 at 293 K

2.17
Reflection Loss, % for two surfaces at 10 µm 7.5
Dielectric Constant for 102-2.5x1010 Hz
at 298 K
at 358 K
5.9
6.35-5.97
Melting Temperature, K 1070
Thermal Conductivity, W/(m K)
at 80 K
at 289 K
at 400 K
35.1
6.5
4.85
Thermal Expansion, 1/K
at 75 K
at 273 K
at 1000 K
19.0
40.0
69.5
Specific Heat, cal/(g K) at 273 K 0.20
Debye Temperature, K 321
Bandgap, eV 9.0
Solubility, g/100 g H2O at 273 K 35.7

Knoop Hardness

15.2 [110]
18.2 [100]
Young's Modulus, GPa 39.96
Rupture Modulus, GPa 0.00393
Shear Modulus, GPa 8.97
Bulk Modulus, GPa 24.32

Refractive Index

Wavelength, µm

0.35

0.46

0.68

1.25

4.50

7.30

9.50

10.6

12.0

13.1

14.2

15.1

16.0

Refractive Index

1.58

1.56

1.54

1.53

1.52

1.51

1.50

1.49

1.48

1.47

1.46

1.45

1.44

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