Hardness
Mohs 9Supports exposed windows that may face abrasion or repeated cleaning.
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Felix Glass Co., Limited manufactures custom sapphire optical windows for teams that need controlled geometry, optical surface quality, durable exposed surfaces and documented inspection requirements. Projects are reviewed against the working wavelength, crystal orientation, sealing design, environment and purchasing specification before quotation. A custom sapphire window manufacturer converts single-crystal aluminum oxide blanks into polished protective or transmissive optical components made to a buyer's drawing. The manufacturing route can include orientation review, blank preparation, CNC shaping, grinding, optical polishing, edge treatment, coating and inspection. Sapphire is commonly evaluated where abrasion resistance, thermal stability and transmission from ultraviolet through infrared wavelengths are important. The entries below are quotation inputs, not universal guaranteed values. Final capability and acceptance criteria are confirmed from the drawing, application and inspection plan. Sapphire is anisotropic and birefringent, so orientation and optical path should be considered alongside mechanical durability. Values and behavior can vary with temperature, wavelength and measurement direction. Supports exposed windows that may face abrasion or repeated cleaning. Useful for mass and mounting calculations during component design. Orientation can matter in polarization-sensitive optical paths. Thermal gradients, mounting stress and sealing design require system-level review. The quality plan should measure what affects system performance rather than apply the same test depth to every order. Drawing revision and acceptance methods are aligned before production. Felix Glass Co., Limited supports drawing-based optical component projects through cutting, CNC grinding, polishing, optional coating coordination, inspection planning and protected packaging. Buyers should request the documents relevant to their own compliance and validation process. Manufacturability feedback can cover geometry, tolerances, orientation, coating inputs and inspection feasibility. Inspection scope and reporting requirements can be defined before quotation and purchase-order release. ISO 9001 quality-system information and applicable RoHS or REACH material documentation can be requested for review. Sample and repeat-order planning can be discussed according to geometry, tooling, quantity and validation needs. Verified public download URLs were not available at preparation time. Use the request links below to obtain the current controlled files instead of relying on an outdated copy. Provide the controlled drawing, dimensions, tolerances, quantity, crystal orientation, scratch-dig, flatness, clear aperture, wavelength, coating, environment and required inspection records. The choice depends on the optical path, polarization sensitivity, thermal design and machining geometry. C-plane is common, but A-plane or R-plane may be appropriate when the system design requires a different axis relationship. Square, rectangular, stepped, slotted and other drawing-based outlines can be reviewed. Feasibility depends on size, thickness, corner geometry, tolerance and edge requirements. Identify the scratch-dig requirement, applicable standard, clear aperture, cosmetic zones and whether coated and uncoated surfaces use different acceptance criteria. State the flatness value, test wavelength, clear aperture, support condition and whether the requirement applies before or after coating. Coating feasibility can be reviewed for the wavelength band, angle of incidence, polarization, environment and durability requirement. Include the coated side and clear-aperture definition. No. Sapphire offers high hardness and useful thermal durability, while fused silica or BK7 may be better for other wavelength, wavefront, cost or fabrication priorities. Material selection should follow the complete system requirement. The inspection plan may include dimensions, edge condition, surface quality, flatness, parallelism, coating appearance and identification. The exact methods and records should be agreed before production. Prototype planning can be discussed based on material availability, geometry, tooling, coating and inspection scope. State the sample quantity and validation plan in the RFQ. Blank availability, orientation, geometry, polishing difficulty, coating schedule, inspection depth, quantity and drawing revision status all affect the quoted schedule. Include the buyer role, application, drawing revision, annual demand, first-order quantity, wavelength, operating environment and the characteristics that are critical to system performance.Drawing-Based Sapphire Windows for Demanding Optical Systems
What Does a Custom Sapphire Window Manufacturer Supply?
Custom Sapphire Window Specification Guide
Specification Field Available Direction RFQ Note Material Optical-grade single-crystal sapphire (Al2O3) State optical, thermal and environmental requirements. Crystal Orientation C-plane, A-plane, R-plane or drawing-defined orientation Specify orientation and optic-axis requirements when critical. Dimension Round, square, rectangular, stepped, slotted or custom outline Provide a controlled drawing with units and datums. Tolerance Commercial to precision dimensional control by feasibility review Identify critical dimensions separately from general tolerances. Surface Quality Commercial polish to optical scratch-dig requirements State the applicable standard and clear aperture. Surface Flatness Project-specific flatness measured at the agreed wavelength Define aperture, test wavelength and measurement condition. Transmission Band Typical uncoated sapphire material range is approximately 0.2-5.5 micrometers Actual transmission depends on thickness, orientation, finish and coating. Coating Uncoated, AR or BBAR; other functional coatings by review Provide wavelength band, angle of incidence and environment. MOQ Prototype and batch quantities reviewed by geometry and process Include annual demand and release quantity when available. Lead Time Quoted after drawing, quantity, material, coating and inspection review Identify sample and production milestones in the RFQ. Why Engineers Evaluate Sapphire for Optical Windows
Hardness
Mohs 9Density
Approximately 3.98 g/cm3Optical Behavior
Birefringent crystalThermal Behavior
Anisotropic and temperature-dependentApplication and Selection Table
Application Buyer Priority Specification Focus Typical Buyer Role EO/IR sensor protection Transmission plus exposed-surface durability Band, incidence angle, flatness, coating and environmental sealing Optical Engineer, R&D Manager Underwater and machine vision Image quality in a sealed assembly Pressure design, aperture, coating, edge condition and housing interface Optical Engineer, Equipment Purchasing Manager High-temperature sensing Thermal stability and optical access Temperature cycle, mounting method, thickness and surface finish R&D Manager, Procurement Director Precision instruments Repeatable geometry and inspection records Datums, tolerances, scratch-dig, flatness and documentation Optical Engineer, Procurement Director Laser or imaging assemblies Wavefront and reflection control Wavelength, power density, flatness, parallelism and coating Optical Engineer, R&D Manager
From Drawing Review to Protected Packing
Inspection Is Matched to the Critical Features
Supplier Evidence Buyers Can Request
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Certification Support
Prototype to Batch
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Custom Sapphire Window Buyer Questions
What information is required for a custom sapphire window quotation?
Which sapphire crystal orientation should an optical engineer specify?
Can sapphire windows be made in non-round shapes?
How should surface quality be stated on the drawing?
What must be specified for sapphire window flatness?
Can AR or BBAR coatings be applied to sapphire?
Is sapphire always better than fused silica or BK7?
How are sapphire windows inspected before shipment?
Can a prototype be ordered before batch production?
What affects lead time for a custom sapphire window?
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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 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.
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?
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.
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.
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.