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Zinc Sulfide Multispectral Windows Infrared Zns Window. Customizable Dimensions: Diameter 3-400mm with tight tolerances: +/-0.02mm for diameter and thickness. High Surface Quality: Surface quality rated 80/50~10/5 (S/D) with parallelism within +/-30''. Flexible Customization: Offers full, minor, and flexible customization from samples or designs. Durable Material: Chemically vapor deposited ZnS, harder and more resistant than zinc selenide. Anti-Reflective Coating: Available with AR coating on both sides for 3-5 microns wavelength. Certified Quality: Products certified with RoHS, ISO9001, and CE standards. 100% Inspection: Every finished product undergoes visual and functional inspection.