Zinc Sulfide (ZnS) is used as a transmission window for IR spectroscopy. Zinc Sulfide (ZnS) is or has been produced under the trademarks Cleartran® and Irtran® . Cleartran® is a registered trademark of CVD Incorporated and Irtran® was a trademark of Eastman Kodak. The Kodak product was discontinued many years ago. When ordering Cleartran® ZnS, customers should specify Cleartran®.

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Optical Properties - Zinc Sulfide (ZnS) Optical Crystals

Transmission Range: 370nm to 14µm
Refractive Index: 2.19 @ 10.5µm
Reflection Loss: 24% at 10.6µm (2 surfaces)

Physical Properties - Zinc Sulfide (ZnS) Optical Crystals

Melting Point:
Hardness (Knoop): 160 psi
Young's Modulus: 74.46 GPa
Modulus of Rupture: 10,000 psi
Structure: Cubic ( polycrystalline )

Chemical Properties-- Zinc Sulfide (ZnS) Optical Crystals

Solubility: Insoluble in water. Soluble in HNO₃. Soluble in strong acids.