Pressure-Oriented Geometry
Diameter, thickness, edge profile, and clear aperture can be reviewed for projects from approximately 100 m to 6000 m working depth, subject to assembly design and qualification testing.
Waterproof Sapphire Viewport for Underwater Detection Equipment
- Model
- FG-SAPP-VP-UNDERWATER-001
Item specifics
- Pressure Resistance Depth
- Custom 100m ~ 6000m Underwater Working Depth
- Surface Treatment
- Double-Sided Optical Polishing, Optional AR Coating
- Sealing Structure
- Precision Ground Flange for O-Ring Waterproof Assembly
- Corrosion Resistance
- Salt Spray & Seawater Corrosion Proof
- Available Sizes
- Custom Diameter 10mm–500mm, Custom Curvature
- Optical Feature
- High UV-Vis-NIR Transmittance, No Distortion
- Custom Service
- OEM ODM Size, Curvature & Coating Customization
Review
Description
This waterproof sapphire viewport is made from single-crystal C-plane sapphire for underwater cameras, ROV detection systems, marine monitoring instruments, and other sealed optical assemblies. The material combines a Mohs 9 surface with optical transmission across UV, visible, and near-infrared bands, helping the exposed window resist sediment abrasion while maintaining a clear optical path. Felix Glass Co., Limited supports drawing-based dimensions, edge geometry, sealing interfaces, and optional anti-reflection coatings. The viewport can be developed around working depth, clear aperture, housing design, and the wavelengths used by the camera or detector. A sapphire viewport is considered when an exposed optical surface must work in a high-pressure, abrasive, or corrosive environment. Compared with ordinary glass, sapphire provides a harder contact surface and stable material behavior in seawater. Final pressure capability, however, depends on the complete assembly: viewport diameter, thickness, unsupported span, edge finish, housing material, seal design, installation preload, and verification method must be reviewed together. Single-crystal sapphire is suitable for contact with seawater and salt-fog environments when the surrounding housing and sealing materials are also selected for marine service. Double-sided optical polishing supports camera, illumination, sensing, and monitoring paths. Optional AR coating can be reviewed around the operating wavelength and incidence angle. The Mohs 9 surface helps reduce damage from suspended particles, handling, and abrasive contact that could degrade image quality over time. Provide working depth, proof pressure, pressure cycles, temperature range, and the required safety or qualification basis. Identify clear aperture, unsupported span, seating surface, retaining method, and housing material. Share O-ring type, groove dimensions, compression target, surface finish, and installation method. Agree dimensional, optical, leak, and pressure checks before manufacturing begins. Application suitability should be confirmed against the optical band, pressure profile, housing design, seawater exposure, cleaning method, and maintenance interval. Felix Glass Co., Limited supports prototype trials and batch OEM/ODM production. Engineering review can cover dimensions, curvature, edge treatment, clear aperture, sealing interface, and optional coating. Inspection planning can include agreed dimensional, surface, optical, and pressure-related checks based on the project specification. Clarify critical dimensions, datums, tolerances, and acceptance points. Coordinate shaping, polishing, edge work, and optional coating. Use sample feedback to refine repeat-order requirements. Outside diameter, thickness, clear aperture, edge features, and mounting details can be measured to the approved drawing. Polish condition, visible defects, flatness or wavefront-related requirements, and coating region can be evaluated as specified. Leak or pressure testing can be discussed when the fixture, pressure profile, duration, medium, and acceptance criteria are defined. Projects up to approximately 6000 m may be reviewed, but suitability depends on diameter, thickness, support geometry, sealing, material condition, safety basis, and system-level qualification. Precision edge and flange features can be reviewed from the housing and seal drawing. Feasibility depends on dimensions, tolerances, and edge-strength considerations. It may help manage reflection, but the wavelength band, angle, immersion environment, cleaning method, and durability requirements should be defined first. Provide the drawing or target dimensions, working depth, housing concept, optical band, surface requirements, quantity, and required inspection or pressure-test conditions. Send the working depth, viewport drawing, housing and seal details, optical wavelength, quantity, and validation requirements. The engineering team can review manufacturability and identify the information needed for a quotation.
Underwater optical access
Product Introduction
Mohs 9 sapphire
Sealed subsea assemblies
UV-Vis-NIR optical path
Interest · Direct answer
Why Sapphire Supports Subsea Optical Access
Engineering note: A requested depth is a system requirement, not a stand-alone material rating. Share the housing drawing and validation standard so the viewport can be evaluated as part of the sealed assembly.
Interest · Evaluation points
Core Technical Advantages
Marine Corrosion Resistance
Optical Transmission
Scratch Resistance
Interest · Drawing inputs
Customizable Specifications
Item Available Project Input Shape Round, oval, rectangular, or curved-surface viewport Size Typical custom diameter or side length from 5 mm to 400 mm; project range may extend to 500 mm after review Thickness Typical custom thickness from 2 mm to 60 mm, based on geometry and assembly requirements Edge and mounting Chamfer, precision-ground flange interface, sealing groove, or mounting holes where feasible Surface Double-sided optical polish with specified clear aperture and cosmetic requirement Coating Optional wavelength-specific or broadband AR coating after application review 
Desire · Assembly reliability
Sealing and Integration Guidance
Define the Load Case
Review the Support
Specify the Seal
Plan Verification
Desire · Application fit
Wide Application Scenarios
Desire · Faster feasibility review
Selection Checklist for OEM Projects
Working and proof depth or pressure
Outside diameter and clear aperture
Thickness and allowable edge geometry
Operating wavelength and incidence angle
Surface quality and transmitted wavefront needs
Housing, O-ring, and retaining method
Temperature and seawater exposure profile
Prototype and production quantities
Desire · Supplier capability
Felix Glass Custom Service
Drawing Review
Custom Processing
Prototype to Batch
Desire · Documented acceptance
Quality Review and Inspection
Dimensional Checks
Surface and Optical Checks
Assembly-Related Validation
Desire · Buyer questions
Frequently Asked Questions
Can the viewport be designed for 6000 m operation?
Can Felix Glass machine an O-ring interface?
Is AR coating recommended for underwater imaging?
What should be sent for quotation?
Action · Start with your system requirements
Inquiry CTA
