Mohs 9 Single Crystal Sapphire
Ultra-hard aerospace-grade substrate provides excellent scratch resistance, impact resistance and long-term durability under harsh airborne and orbital conditions.
✔ OEM / ODM Customization
✔ Free Drawing DFM Technical Review
✔ 24-Hour Professional Quotation
✔ Flexible Low MOQ & Fast Prototypes






Felix Glass Co., Limited manufactures aerospace grade sapphire optical covers and custom sapphire window lids fabricated from premium single-crystal sapphire. These high-performance protective optics shield sensitive optical sensors, cameras and precision instruments under extreme aerospace operating environments while preserving high light transmittance and consistent dimensional stability. Featuring Mohs 9 extreme hardness, superior thermal shock resistance and broad-spectrum transmission, our sapphire covers guarantee stable operation of critical optical systems under high temperature, pressure and cosmic radiation conditions.
Standard optical glass lacks sufficient hardness, thermal stability and radiation tolerance required for space, high-altitude aircraft and defense optical equipment. Aerospace grade sapphire window lids deliver outstanding scratch and impact resistance, wide UV to mid-infrared transmission and low thermal expansion. The rigid sapphire barrier protects internal optical assemblies against particle erosion, rapid temperature fluctuation and long-duration space radiation without degrading imaging or sensing performance.
Ultra-hard aerospace-grade substrate provides excellent scratch resistance, impact resistance and long-term durability under harsh airborne and orbital conditions.
Stable transmittance covering 150nm to 5.5μm, supporting multi-band UV, visible and mid-infrared aerospace optical detection systems.
Shape, dimension, thickness, mounting holes, edge finishing and aerospace AR coating specifications can be finalized per customer engineering drawings before production.
The core raw material is high-purity aerospace single-crystal sapphire. For projects with strict cost control without extreme abrasion requirements, fused silica optical windows can be selected as an alternative solution. We support wavelength-specific AR anti-reflection coatings and customized mechanical features including mounting holes, chamfered edges and sealing profiles.
| Product type | Aerospace Grade Sapphire Optical Covers | Custom Sapphire Window Lids |
|---|---|
| Model reference | FG-SAPPHIRE-COVER-AERO01 |
| Material | Aerospace Grade High-Purity Single-Crystal Sapphire |
| Spectral Transmission Range | 150nm ~ 5.5μm (UV – Visible – Mid IR) |
| Mohs Hardness | 9.0 |
| Operating Temperature | -200℃ ~ 1600℃ |
| Surface Quality | Aerospace Grade 20/10, 10/5 MIL STD |
| Dimensional Tolerance | ±0.01mm |
| Coating Options | Wavelength-specific AR anti-reflection coating |
| Customizable Items | Shape, size, thickness, mounting holes, edge treatment |
| Quality Standard | Aerospace-grade optical performance & environmental stability inspection |
Orbital altitude, flight speed, spectrum band and environmental loads determine final outline geometry, thickness and coating scheme. Our aerospace sapphire optical covers deliver consistent protection for space-borne payloads, airborne platforms and ground defense optical detection equipment.
Protective sapphire window lids for on-orbit observation payloads resisting long-term cosmic radiation and temperature cycling.
Hard sapphire covers shield airborne cameras and targeting optics under high-altitude flight conditions and particle erosion.
Reliable optical protection for military optical equipment and industrial optical instruments operating under extreme temperature and abrasion conditions.
Check outline dimension, thickness, mounting hole layout, optical zone, tolerance and environmental working requirements.
Select qualified single-crystal sapphire ingot and calculate machining allowance according to customer aerospace drawings.
CNC contour cutting, hole machining and surface grinding to form custom flat or curved sapphire cover geometry.
Ultra-precision surface polishing followed by vacuum deposition of wavelength-matched AR anti-reflection coatings.
Full dimension, surface and optical testing; shockproof anti-scratch packaging for aerospace supply chain transit.
We support small-batch prototype sampling and large-volume serial manufacturing of custom aerospace sapphire optical covers and window lids. To receive accurate formal quotation, please submit engineering drawing, order quantity, outline specification, coating requirements, dimensional tolerance, operating environment and aerospace acceptance testing standards.
Prototype lead time and bulk delivery cycle depend on part shape complexity, customized hole features and aerospace coating testing requirements. Simple flat sapphire cover models complete feasibility evaluation rapidly; complex multi-feature aerospace components will arrange dedicated engineering communication to optimize design and control overall project cost.
Optical surfaces face continuous abrasion, particle impact, repeated cleaning; priority is extreme surface hardness and long service lifetime in harsh aerospace environments.
Application focuses on wide UV transmission, ultra-low thermal expansion and high-temperature resistance without demanding scratch-resistant performance.
The optical system operates on fixed wavelength bands and requires minimized surface reflection to improve imaging and detection signal-to-noise ratio.
Aerospace sapphire optical covers protect optical sensors, cameras and precision instruments on satellites, aircraft and defense systems, delivering scratch resistance, thermal stability and high transmittance under extreme harsh environments.
Yes. We fully customize outline shape, dimension, thickness, mounting holes and edge finishing strictly according to your technical drawings and aerospace specifications.
We provide wavelength-targeted AR coatings for UV, visible and infrared wavebands to maximize light transmittance matching your specific optical system design.
All sapphire optical covers are manufactured and inspected following aerospace-grade requirements covering optical performance, dimensional accuracy and environmental stability testing.
Yes. We offer prototype sampling, small-batch trial production and mass manufacturing to satisfy different verification and formal production phases of aerospace projects.
Share your aerospace project background, sapphire optical cover engineering drawing, coating specifications and target order quantity. Felix Glass aerospace optical engineering team will evaluate manufacturability, optical performance and inspection requirements and issue official quotation for custom aerospace grade sapphire window lids.
Send us your drawing, dimension & coating requirements for fast quotation within 24 hours.
Get Free RFQWe supply Industrial Glass, Sapphire Optics, Optical Lenses/Prisms/Filters, Infrared IR Optics, Functional & Display Glass, N-BK7/H-K9L Optical Glass, supporting OEM mass production and laboratory custom prototypes. Flexible MOQ & free sample service available. Fill in the form to download full datasheets and get factory wholesale price within 24 hours.


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.
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.
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.
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.
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.