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Home / All / Optical Glass Dome vs ZnS Infrared Window: Key Differences & Selection Guide

Optical Glass Dome vs ZnS Infrared Window: Key Differences & Selection Guide

Apr 23,2026

Choosing the right optical protective component directly affects imaging effect, service life and equipment stability. Many optical industry buyers easily confuse optical glass domes and ZnS infrared windows. This article clearly explains their material differences, optical performance, application scenarios and purchasing suggestions, to help you make accurate product selection.

1. Basic Material Difference

Optical Glass Dome

Main materials: BK7, K9 optical glass, fused silica glass, high borosilicate glass.

It belongs to visible light optical glass, with high light transmittance in visible light band, clear imaging, good hardness and strong pressure resistance.

ZnS Infrared Window

Main material: high purity zinc sulfide crystal.

It is a professional infrared crystal material, not ordinary optical glass. It has excellent stable light transmittance specially for 10.6μm infrared wavelength band.

2. Optical Performance Difference

Light Transmission Band

- Optical glass dome: Focus on visible light imaging and scene shooting

- ZnS infrared window: Focus on infrared light, thermal imaging and CO2 laser transmission

AR Coating Feature

Both support professional anti-reflection coating.

- Glass dome coating optimizes visible light clarity and imaging definition

- ZnS coating is professionally customized for 10.6μm infrared laser, to reduce infrared light reflection loss

Optical Distortion

Optical glass dome owns ultra-low optical distortion, which can restore real shooting details perfectly.

ZnS crystal keeps stable infrared optical transmission, with no light deviation and color difference.

3. Application Scenarios

Optical Glass Dome

- Underwater camera & deep sea ROV monitoring equipment

- CCTV security surveillance camera system

- Marine observation & outdoor optical imaging devices

- Industrial visible light optical detection instruments

ZnS Infrared Window

- 10.6μm carbon dioxide laser equipment

- Infrared thermal imaging detection camera

- Industrial infrared temperature measuring device

- Professional military infrared optical system

4. Shape & Structural Design

- Optical glass dome: Mainly hemispherical curved dome, with plain edge, flat bottom and flanged edge optional styles

- ZnS window: Available in flat sheet window and hemispherical dome shape, customized for professional infrared optical path layout

5. Product Selection Guide

1. For camera monitoring, underwater shooting and visible light imaging equipment → choose BK7 K9 optical glass dome

2. For infrared laser, heat detection and thermal imaging optical system → choose AR coated ZnS infrared window

3. For harsh high-pressure deep water environment, prefer fused silica and borosilicate glass dome

4. For high-precision industrial infrared equipment, customize high-purity ZnS crystal dome window

Our Custom OEM Service

Our factory manufactures both optical glass domes and ZnS infrared windows with full customization.

We support adjustable size, thickness, surface tolerance, AR coating and shape polishing, suitable for small batch customization and mass production.

All products pass strict optical quality inspection, with stable performance, factory direct price and fast delivery for global optical equipment manufacturers.

If you have component customization demands, welcome to contact us for professional optical solution and quotation.

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What is your MOQ for custom optical glass and display glass parts?: Felix Glass offers highly flexible MOQ to support client projects, including prototype testing, small batch trial orders and large-volume mass production. All products can be fully customized according to your drawings, tolerances and application standards. Send us your specs to get an accurate price quote within 24 hours.

Can I get free glass samples for testing before bulk order?: Yes, our FELIX GLASS factory supports sample testing for a wide range of precision optical glass components and assemblies. The lead time for sample production is 3 to 7 working days. Please contact us today to arrange samples and obtain a customized solution that meets your needs.

What is the production lead time for custom optical glass components?: What is the production lead time for custom optical glass components?
Answer: The lead time for standard samples is 3–7 business days, while mass production takes 15–25 business days, depending on product complexity and order volume. We provide reliable, rapid delivery for orders serving the industrial, medical, automotive, and aerospace sectors. Please submit your project details to receive an accurate delivery schedule.

Are your optical glass products ISO, CE and RoHS certified?: All FELIX GLASS precision optical glass components comply with ISO quality system standards, as well as CE and RoHS requirements. We provide comprehensive test reports, material certificates, and inspection documentation for customer review. Please feel free to request full certification details and a formal quotation today.

Do you offer one-stop custom optical glass processing services?: Yes. We provide a full range of in-house processing services, including CNC machining, precision grinding, optical polishing, vacuum coating (AR, AF, AG, IR), tempering, and screen printing. Every step—from raw material to finished product—is carried out within our own facility. Please let us know your requirements, and we will provide you with the most cost-effective solution.

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