Custom Sapphire Dome
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Subsea Sapphire Hemispherical Dome | High Pressure & Seawater Resistant | EO/IR Sensor Protection Felix Glass fabricates custom single-crystal sapphire domes for deep subsea ROV, marine camera, aerospace, airborne gimbal and rugged multi-sensor systems. Sapphire’s Mohs 9 hardness, excellent pressure endurance and seawater stability make it the premium choice for long-lifetime underwater optical housings. AR, DLC and combined AR+DLC coatings are available. Sapphire Hemispherical Dome | Single Crystal Sapphire Single-crystal sapphire (Al₂O₃) is the gold-standard dome material for deep subsea and high-reliability optical systems. It transmits UV, visible and near/mid-wave infrared up to ~5μm, with unmatched scratch resistance, seawater corrosion resistance and thermal shock stability. Unlike CVD ZnS, sapphire is not susceptible to moisture degradation, making it ideal for continuous underwater deployment. Material substrate does not equal final performance grade. Specify crystal orientation, operating depth, wavelength band and coating for accurate quotation. Interferometer Inspection Precision Polishing Finished Sapphire Dome All sapphire domes are inspected for surface figure, transmission and scratch-dig. Hydrostatic pressure testing is available to validate rated subsea depth. Wavelength-matched AR coating maximizes light transmission for your camera or sensor. DLC coating delivers superior scratch resistance and moisture barrier for marine and salt-spray environments. AR+DLC combined coating is the top recommendation for subsea sapphire domes, balancing high optical throughput and long service life. Learn more about infrared optical coating technology. To generate an accurate quotation within 24 hours, please prepare below information: Sapphire is the preferred subsea dome. ZnS absorbs moisture and degrades under seawater exposure. Sapphire is seawater inert, high hardness and pressure-resistant, but it cannot cover 8–14μm LWIR thermal band. No. Sapphire transmission cuts off near 5μm. For pure LWIR thermal 8–14μm, CVD ZnS dome is the correct material choice. Yes. We optimize wall thickness, radius and flange geometry according to your target hydrostatic pressure, and optional pressure test certification is available.
Custom Sapphire Dome Manufacturer
OEM Manufacturing | AR / DLC Coating | Subsea Custom SpecificationsMaterial & Grade Overview
Key Specifications & Custom Options
Substrate Material
Single Crystal Sapphire (Al₂O₃)
Shape
Hemispherical dome, partial dome, plano-convex dome, custom radius & flange
Size Range
Dia 10mm‑350mm, custom wall thickness, O-ring groove and flange profile
Surface Quality
20‑10 /40‑20 scratch‑dig, customized per customer drawing
Working Wavelength Band
0.2–5.0μm, UV / Vis / NIR / MWIR broadband transmission
Coating Options
Uncoated, UV AR, VIS-NIR AR, MWIR AR, DLC hard coating, AR+DLC combined
Custom Machining
Flange machining, O-ring groove, stepped edge, chamfer, pressure matched dome design
Inspection
Interferometer, spectrophotometer, hydrostatic pressure test optional, material certificate available
Manufacturing & Inspection Evidence
Typical Application
Coating Selection Guide
Order & Quotation Requirements (Valid RFQ Checklist)
Send Drawing For Quote
FAQ Snippets
Sapphire dome vs ZnS dome for underwater use?
Can sapphire dome work for 8–14μm LWIR thermal imaging?
Can you custom design sapphire dome to meet a specific depth rating?
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