For windows,domes and lenses for thermal-imaging system.
CVD ZnS, which appears orange, mainly works in Far-infrared region
Multi-spectrum ZnS (M-ZnS) shows excellent optical properties across the full band of 0.4-12μm, can be used in Far-, Mid-, Near-infrared and visible regions.
CVD ZnS windows, lenses and domes with size up to Ø250×16mm. For M-ZnS, the maximum size is 300×200×15mm
Main Properties
|
Appellation
|
Standard CVD ZnS
|
Multi-Spectral ZnS
|
|
Homogeneity of refractive index
|
<3×10-5 @0.6328μm
|
<3×10-5 @0.6328μm
|
|
Hardness(knoop)(kg/mm2)
|
210-230
|
160
|
|
Rupture modulus(Mpa)
|
103.4
|
68
|
|
Young's Modulus(GPa)
|
74.5
|
74.5
|
|
Posson ratio
|
0.29
|
0.28
|
|
Melting point (℃)
|
1830
|
1830
|
|
Density, (g/cm3)
|
4.09
|
4.09
|
|
Thermal conductivity(W/cm.K)
|
0．19
|
0.272
|
|
Thermal expansion coefficient, (10-6 ，℃-1 )
|
7.85
|
7.85
|
|
Specific heat (Cal/g.k.)
|
0.112
|
0.124
|
|
Dielectric constant
|
8.35
|
8.35
|
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