Unsupported Aperture
The free diameter exposed to pressure directly affects stress. Provide the clear opening, supported diameter, and contact width.
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High Pressure Resistant Sapphire Sight Glass
| Share | |
|---|---|
| Categories | Sapphire Optical Windows |
| Brand | FELIX GLASS optical glass Manufacturing base |
| Model | FG-SAPP-SIGHT-HP-001 |
| Base Material | Optical Grade Single Crystal Sapphire (C-Plane Standard, Other Crystal Orientations Available) |
| Pressure Resistance | Custom Rated Pressure 0.1–120 MPa, Custom Wall Thickness For Extreme Pressure |
| Surface Finish | Double-Sided Optical Polishing, Optional Broadband AR Coating |
| Sealing Edge Process | Precision CNC Chamfer For O-Ring / Flange Sealing Assembly |
| Available Shapes | ound / Oval / Rectangle / Custom Cutout Sight Glass Blank |
| Application Field | High-Pressure Furnace, Hydraulic Test Chamber, Petrochemical Pipeline, Industrial Pressure Vessel |
| Custom Machining | Cutting, Drilling, Countersinks, Slots, Laser Marking, Edge Chamfering |
| FOB port | SHENGZHEN SHANGHAI GUANGZHOU |
| Terms of Payment | L/C, D/A, D/P, T/T |
| Download |  |
Detail Information
Attention
Product Overview
High pressure resistant sapphire sight glass provides a clear observation surface for industrial equipment that combines pressure, temperature, corrosive media, or abrasive particles. Felix Glass Co., Limited manufactures drawing-based single-crystal sapphire windows for furnaces, pressure vessels, hydraulic and pneumatic test chambers, reactors, and petrochemical pipelines.
Direct answer: The listed customization range is 0.1 MPa to 120 MPa, with 3 mm to 60 mm thickness options and thicker blanks reviewed for higher-pressure projects. A finished sight-glass assembly must be rated from the complete design, including clear aperture, unsupported diameter, thickness, edge geometry, flange, gasket or O-ring, temperature, pressure cycles, and proof-test method.
For adjacent round, square, coated, and shaped formats, review the Sapphire Optical Windows category.
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Core Technical Specification Table
These values preserve the current product's customization directions. Final dimensions, tolerances, ratings, and acceptance criteria should be stated on the approved drawing and purchase specification.
| Parameter | Current Customization Direction | Engineering Review Note |
|---|---|---|
| Base material | Optical-grade single-crystal sapphire; C-plane standard | Other crystal orientations can be reviewed. |
| Pressure range | 0.1 MPa to 120 MPa listed customization range | Not a blanket assembly rating; pressure capability depends on the complete installation. |
| Standard thickness | 3 mm to 60 mm; thicker blanks reviewed for pressure above 50 MPa | Thickness is selected with aperture, support, temperature, cycling, and safety factor. |
| Sealing interface | O-ring, metal flange, or metal-gasket assembly | Define seal material, groove, preload, media, and surface condition. |
| Surface finish | Double-sided optical polishing | State scratch-dig, roughness, clear aperture, and cosmetic limits. |
| Surface flatness | λ/4 to λ/10 options | Specify test wavelength, aperture, and measurement condition. |
| Optional coating | Broadband anti-reflection coating | Provide wavelength, angle, temperature, medium, and coated side. |
| Edge machining | Safety chamfer, countersink, sealing step, or groove | Include datums, radii, edge limits, and seal-interface tolerances. |
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Core Technical Advantages
Compressive Load Capability
Single-crystal sapphire is considered for pressure-window designs where the blank thickness and supported aperture can be matched to the load case. The listed 0.1 MPa to 120 MPa range requires project-specific review.
Chemical Stability
Sapphire resists many acids, alkalis, salt environments, oils, and moisture conditions. Compatibility must also include the coating, seal, housing, and process medium.
Temperature Capability
The current product information identifies a -196°C to 1800°C material and application design range. Continuous assembly temperature depends on the seal, coating, thermal gradient, atmosphere, and duty cycle.
Machined Sealing Features
CNC chamfers, steps, grooves, countersinks, and locating features can be produced from the approved interface drawing to support repeatable assembly.
Mohs 9 Surface Hardness
Sapphire's hard surface helps resist scratching from handling, particles, and industrial exposure, supporting longer observation clarity than softer window materials in abrasive service.
For rectangular housings or drawing-based blanks, compare the square custom sapphire optical blank.
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Full Custom CNC Machining Capacity
Blank Forming
Straight cutting, round or shaped profiling, through holes, and safety-edge chamfers.
Sealing Features
Countersinks, locating features, step edges, and grooves based on the flange and seal drawing.
Optical Finishing
Double-sided polishing, flatness control, surface-quality inspection, and optional AR coating.
Traceability Marking
Permanent laser marking for part number, drawing revision, pressure class, or batch identification when specified.
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Wide Industrial Application Scenarios
Industrial Furnaces
Observation windows for process monitoring where temperature, deposits, and pressure are part of the design review.
Test Chambers
Visual access for hydraulic and pneumatic pressure testing with a defined proof-test and guarding plan.
Petrochemical Pipelines
Flow or liquid-level observation where media compatibility and the flange-seal system are specified.
Reactors and Autoclaves
Observation ports for process vessels that require coordinated pressure, temperature, and chemical-resistance criteria.
Energy and Subsea Equipment
Drawing-based windows for pressure tanks and underwater systems after external pressure, sealing, and cyclic-load review.
For furnace-specific planning, see the Furnace Observation Solution. Sensor projects can reference the high-temperature industrial sensor sapphire window.
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Matching the Window to the Observation System
Provide the Load Case
- Normal, peak, and proof pressure
- Internal or external pressure direction
- Static or cyclic duty and ramp rate
- Operating and transient temperature
Provide the Interface
- Clear aperture and supported diameter
- Flange, groove, gasket, or O-ring drawing
- Bolt pattern and tightening method
- Allowable edge and surface contact
Provide the Optical Need
- Wavelength and viewing angle
- Flatness and surface quality
- Transmission or reflection target
- Coating side and environment
For a band-matched optical surface, review the AR-coated sapphire protection window.
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Production and Inspection Standards
The current product quality plan identifies three inspection checkpoints. Test conditions, sample quantity, documentation, and acceptance criteria should be agreed before production.
- Pressure test planningHydrostatic proof or burst testing can be defined around the fixture, pressure profile, hold time, sample plan, and safety requirements.
- Flatness inspectionInterferometer measurement can verify the specified clear aperture, wavelength, and surface condition.
- Transmission measurementSpectrometry can document bare-sapphire or coated-window performance over the agreed wavelength range.
- Dimensional and visual reviewThickness, diameter, steps, grooves, chamfers, chips, scratches, and markings are checked against the approved criteria.
Prototype and production quantities are supported. Lead time is confirmed after the drawing, material, machining, coating, testing, and documentation scope are reviewed.
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Frequently Asked Questions
What maximum pressure can this sapphire sight glass support?
The current customization range is 0.1 MPa to 120 MPa, with thicker blanks considered for higher-pressure work. The approved rating must come from the complete assembly design and its validation plan.
Can the sealing edge match an existing flange?
Yes. Provide the flange, gasket or O-ring, groove, bolt pattern, and mating-surface drawing so chamfers, steps, countersinks, and locating features can be reviewed.
Is AR coating available for furnace observation?
Broadband AR coating is optional. Specify wavelength, viewing angle, temperature, atmosphere, coated side, and the required transmission or reflection result.
What temperature range can be considered?
The current product information lists -196°C to 1800°C as a material and application design range. The usable assembly range depends on seals, coating, atmosphere, thermal gradient, dwell time, and cycling.
Can Felix Glass support prototypes?
Yes. Prototype and production quantities can be discussed after dimensions, pressure case, sealing interface, optical requirements, coating, and inspection scope are defined.
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Engineering Inquiry Guide
Felix Glass Co., Limited provides drawing-based sapphire blank forming, CNC machining, optical polishing, coating, marking, and inspection support for furnace, pressure-vessel, pipeline, reactor, test-chamber, and sensor projects.
Send the drawing, quantity, pressure profile, temperature range, medium, clear aperture, seal design, optical specification, coating requirement, and requested test documentation for a feasibility review and project-specific quotation.
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Custom Precision Optical & Glass Components Manufacturer – Felix Glass Co., Limited.
We 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.
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Learn more from our FAQ
- 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.
CONTACT US NOW FOR A QUOTE
We will respond promptly within 1 to 5 hours and provide an optimal, formal quotation within 1 to 2 days. Partnering with us is the smartest choice—start a mutually beneficial partnership today!
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With 19 years of experience as a precision optical glass expert, we provide comprehensive and satisfactory customized solutions.
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