Europe, UK, Asia & RoW: [email protected] +44 (0)1622 859444 | USA & Canada: [email protected] +1 401-583-7846

BREXIT UPDATE: Knight Optical will continue to provide quality assured service for all your optical requirements both custom & stock. We will handle all requirements caused by the new regulations.


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Zinc Sulphide

Zinc Sulphide (ZnS) is a widely-used IR transmitting material used for windows, lenses and other optical components and is sometimes referred to as Cleartran™. The material transmits at about 50% between 0.4 -12μm before dropping off to zero transmission at around 15μm. Its low absorbance in the IR spectrum makes it suitable for CO2 lasers operating at 10.6μm. Zinc Sulphide has a pale yellow appearance and a hardness of HK160. Although the material is resistant to thermal shock, it is not recommended for harsh environments.


Knight Optical supply a range of quality Zinc Sulphide optical components including Zinc Sulphide windows, Zinc Sulphide lenses, Zinc Sulphide prisms, and Zinc Sulphide blanks either from stock or custom made to your specification. Every component is individually tested by our highly skilled technicians in our state of the art metrology lab to ensure all components meet our high quality standards.

Contact our multilingual technical sales team and discover how Knight Optical’s high quality Zinc Sulphide optical components and service can improve your instrumentation and supply chain experience.

Our 2018/2019 Catalogue

Inside Knight Optical’s catalogue you’ll find details of the industries we serve as well as the many other services we can offer. It also showcases hundreds of our most popular products, supported by useful technical information, to help you choose the right part for your application.
Click below to view our digital catalogue now.

view our catalogue