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GENERAL

Crystal structure Monocrystalline, Polycrystalline

Types available* IR Grade, UV Grade, Excimer Grade

CRYSTALLOGRAPHIC

Syngony Cubic

Symmetry Class m3m

Lattice Constants, Angstrom a=5.462

c=a

Cleavability <111>, perfect

Orientation <111>, <100>

OPTICAL

Refractive Index at ne 1.4349

Refractive Index nF’-nC’ 0.0043

Refractive Index at n10.6 1.2996

Thermal Coefficient of Refractive Index

at 3.39 microns for +/-60 deg C (-0.95)... (-1.17) x 10-5

Transmission Range, microns 0.15-9.0

THERMAL

Thermal Linear Expansion, deg C-1

for +/-60 deg C (16.5...19.4) x 10-6

Thermal Conductivity, W/(m•deg C)

at 36 deg C 9.71

Specific Heat Capacity, J/(kg•deg C) 0.8876 x 103

Thermal Stability, deg C 20 +/-2

Melting Point, deg C 1418

MECHANICAL

Density, g/cm3 at 20 deg C 3.18

Mohs Hardness 4

Vickers Microhardness, Pa 165 x 107

Constants of Elastic

Compliance, Pa-1 S11=6.83 x 10-12

S12=-1.53 x 10-12

S44=29.58 x 10-12

Young Modulus (E), Pa

in <100> direction 14.61 x 1010

in <111> direction 8.99 x 1010

Shear Modulus (G), Pa

in <100> direction 4.76 x 1010

in <111> direction 3.38 x 1010

Poisson Ratio 0.216

CHEMICAL

Molecular Weight 78.08

Solubility

in water, gram/100 cm3 0.0016

*IR Grade is the most commonly used grade in MPF Products Inc.

however  MPF reserves the right to use any

grade at its discretion.

Refr. Index n vs. Wavelength l

                     WAVELENGTH,                              REFRACTIVE

                        MICRONS                                        INDEX

0.2                                  1.4951

0.5                                  1.4365

1.0                                  1.4289

2.0                                  1.4239

3.0                                  1.4179

4.0                                  1.4096

5.0                                  1.3990

6.0                                  1.3856

7.0                                  1.3693

8.0                                  1.3498

9.0                                  1.3268

10.0                                1.3002

11.0                                1.2676

12.0                                 1.2299

Internal Transmittance t i (l) vs. Wavelength l

         WAVELENGTH,                      INTERNAL

               MICRONS                    TRANSMITTANCE

0.35                                        0.97

0.5                                          0.97

1.0                                          0.99

3.0                                          0.99

5.0                                          0.99

6.0                                          0.98

7.0                                          0.97

8.0                                          0.88

9.0                                          0.59

10.0                                        0.19

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:                             20/10 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.