Product Name: Custom Size High Quality Zns Laser Protection Window with Coating Model NO.: D5~D300mm Coating: Polish Customized: Customized Certification: RoHS, ISO9001 Lenses Color: Yellow Material: Zns CVD Zns Shape: Round Transmittance: >95% Type: Round Usage: Optical Trademark: ICC Transport Package: Wrapped in Silk Paper Origin: Qinhuangdao China HS Code: 9001909090 Product Description ZnSFor windows,domes and lenses for thermal-imaging system.CVD ZnS, which appears orange, mainly works in Far-infrared regionMulti-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 PropertiesAppellationStandard CVD ZnSMulti-Spectral ZnSHomogeneity of refractive index<3×10-5 @0.6328μm<3×10-5 @0.6328μmHardness(knoop)(kg/mm2)210-230160Rupture modulus(Mpa)103.468Young's Modulus(GPa)74.574.5Posson ratio0.290.28Melting point (ºC)18301830Density, (g/cm3)4.094.09Thermal conductivity(W/cm.K)0.190.272Thermal expansion coefficient, (10-6 ,ºC-1 )7.857.85Specific heat (Cal/g.k.)0.1120.124Dielectric constant8.358.35Specifications:Material:ZnSDimension Tolerance+0.0/-0.1mmThickness Tolerance:±0.1mmSurface quality:60/40Clear Aperture:>85%Flatness:λ/2@633nmParallelism:3'