High Hardness Sapphire Window | UV-Vis-IR Transparent | Pressure & Seawater Resistant Felix Glass supplies custom single-crystal sapphire optical windows for underwater ROV, aerospace, laser, surveillance and rugged sensor systems. Sapphire delivers superior hardness, thermal shock resistance and chemical stability, compatible with AR, DLC and combined AR+DLC coatings. Sapphire Optical Window | Single Crystal Sapphire Single-crystal sapphire (Al₂O₃) is a premium hard optical substrate transmitting from UV through visible, NIR and mid-wave IR. It features outstanding Mohs 9 hardness, seawater corrosion resistance, high pressure bearing capacity and excellent thermal shock performance. Compared with ZnS, fused silica and silicon, sapphire is the preferred choice for long-life subsea, abrasive and high-reliability airborne applications. Material substrate does not equal final performance grade. Specify wavelength, pressure rating and coating for accurate quotation. Interferometer Inspection Precision Polishing Finished Sapphire Window All sapphire windows are inspected for surface figure, transmittance and scratch-dig quality. Pressure testing is available for subsea-rated components. AR coating boosts transmission for target wavebands. DLC coating adds extra scratch and chemical resistance for marine and sandy environments. AR+DLC combined coating is recommended for subsea sapphire windows where both high transmission and ruggedness are required. Learn more about infrared optical coating technology. To generate an accurate quotation within 24 hours, please prepare below information: Sapphire is Mohs 9 hard, seawater resistant and pressure-capable. ZnS is soft and prone to moisture attack; fused silica lacks mid-IR transmission for thermal imaging. Sapphire cuts off around 5μm. It is not suitable for pure LWIR thermal-only systems; ZnS is the standard for 8–14μm thermal imaging. Yes. We can drill, counterbore, machine O-ring grooves and stepped flanges per your drawing, with full inspection after precision machining.
Custom Sapphire Optical Window Manufacturer
OEM Manufacturing | AR / DLC Coating | Custom SpecificationsMaterial & Grade Overview
Key Specifications & Custom Options
Substrate Material
Single Crystal Sapphire (Al₂O₃)
Shape
Round window, square / rectangular plate, disc, blanks, custom profile
Size Range
Dia 5mm‑300mm, custom thickness, edge flange & O-ring groove
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
Chamfer, drilling, counterbore, O-ring groove, stepped flange, edge polishing
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
Why choose sapphire instead of ZnS or fused silica for subsea?
Does sapphire transmit 8–14μm LWIR thermal band?
Can you machine sapphire windows with holes and O-ring grooves?
Related Products
- What is the minimum order quantity for custom precision optical glass components?
FELIX OPTICAL GLASS offers highly flexible MOQs to support customer projects, including prototype testing, small-batch trial orders, and high-volume production. All products can be fully customized to your drawings, tolerances, and application standards. Please send us your specifications, and we will reply within 1-5 hours and provide an accurate quotation after careful evaluation within 1-2 days.
- 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?
A: The production cycle for standard samples is 3-10 working days, while mass production requires 15-35 working days, depending on the complexity of the product and the order quantity. We provide reliable precision optical glass components and fast delivery services for orders from industries such as defense, industrial equipment, medical devices, shipbuilding, robotics, automotive, and aerospace. Please submit your project details so we can provide you with an accurate delivery schedule.
- Are your optical glass products ISO, CE and RoHS certified?
All precision optical glass components from FELIX OPTICAL GLASS comply with ISO quality system standards as well as CE and RoHS requirements. We provide comprehensive test reports, spectral graphs, material certificates, and inspection documents for customer review. Please feel free to request complete certification details and a formal quotation at any time.
- Do you offer one-stop custom optical glass processing services?
Yes. We offer a full range of precision optical glass component processing services, including CNC machining, precision grinding, optical polishing, chemical/physical tempering, vacuum coating (AR anti-reflective coating, AF anti-fingerprint coating, AG anti-glare coating, IR infrared coating), and screen printing. From raw materials to finished products, every step is completed in our own factory. Please tell us your needs, and we will provide you with the most cost-effective solution.
- Name
- *Title
- *Content
With 19 years of experience as a precision optical glass expert, we provide comprehensive and satisfactory customized solutions.
Felix Glass Expands IR Optics Production | Faster Lead Time for Custom ZnS, ZnSe, Sapphire & Fused Silica WindowsFelix Glass manufactures custom ZnS, ZnSe, sapphire domes & fused silica IR windows. Fast prototype and AR coating available. Get your technical quote within 24h for thermal imaging & laser systems.
DMS Cover Glass Material Selection: Aluminosilicate vs Borosilicate Glass for In-Cabin CameraSelecting the right substrate impacts DMS camera lifespan & image quality. This guide compares aluminosilicate and borosilicate glass. Felix Glass provides both substrates with printing and coating.