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CRYSTALLOGRAPHIC

Syngony                                             Cubic

Symmetry Class                                  43m

OPTICAL

Refractive Index at n10.6                  2.4028

Thermal Coefficient of Refractive Index

at 10.6 microns                                  6.1 x 10-5

Transmission Range, microns             0.55-20

THERMAL

Thermal Linear Expansion, deg C-1

at 27 deg C                                         7.57 x 10-6

Thermal Conductivity, W/(m•deg C)

at 20 deg C                                         16

Specific Heat Capacity, J/(kg•deg C) 0.339 x 103

MECHANICAL

Density, g/cm3 at 20 deg C                5.27

Mohs Hardness                                   4

Young Modulus (E), Pa                       7.03 x 1010

Poisson Ratio                                      0.28

CHEMICAL

Molecular Weight                               144.33

Solubility

in water, gram/100 cm3                    insoluble

in acids                                                soluble

Refr. Index n vs. Wavelength l

             WAVELENGTH,   REFRACTIVE

                  MICRONS              INDEX

0.58                 2.6754

1.0                   2.4892

3.0                   2.4376

5.0                   2.4295

7.0                   2.4218

9.0                   2.4122

10.6                 2.4028

11.0                 2.4001

13.0                 2.3850

15.0                 2.3623

17.0                 2.3448

Leak Rate:                                    <2x10(-10) atm cc/sec He  

Parallelism:                                  <3 Arc Minutes

Flange Material:                           304/316 Stn. Stl.

Flatness:                                       l /4@ 632nm Transmitted Wavefront

Surface Finish:                             40/20 Scratch/Dig                              

Thermal Range:                            -100 to 200oC                           

Operating Conditions  

The thermal ratings specified are safe operating limits determined by various factors including

material properties, mechanical design, and the intended operating environment. Temperature

ratings for various mounting options may reduce the operating range of a window assembly.

All assemblies have a maximum thermal gradient of 25ºC per minute and may be damaged if

this limit is exceeded.