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CF Sapphire Vacuum Viewport
The CF Sapphire Vacuum Viewport combines a precision stainless steel ConFlat flange with a premium sapphire optical window, delivering exceptional optical performance, superior mechanical strength, and reliable vacuum sealing for high-vacuum and ultra-high-vacuum applications.
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Technical data
CF Sapphire Vacuum Viewport Overview
The CF Sapphire Vacuum Viewport is engineered for demanding high-vacuum (HV) and ultra-high-vacuum (UHV) applications requiring exceptional optical performance and mechanical durability. Featuring a precision-machined stainless steel ConFlat (CF) flange and a single-crystal sapphire window, it offers outstanding optical transmission, excellent scratch resistance, and superior pressure performance.
Compared with conventional borosilicate and quartz viewports, sapphire windows provide significantly higher hardness, greater mechanical strength, and improved resistance to high-pressure and abrasive environments. These advantages make sapphire the preferred material for semiconductor equipment, laser systems, plasma research, spectroscopy, high-pressure vacuum chambers, and scientific instrumentation.
Available in standard CF flange sizes and custom configurations, our sapphire vacuum viewports deliver long-term reliability in the most demanding industrial and research environments.
CF Sapphire Vacuum Viewport — Technical Data
| Project Description | Parameters |
|---|---|
| Model | CF16-250 |
| Structure | 304/316 Stainless steel flange+4J34 Kovar alloy+Optical sapphire glass+Silver-based alloys |
| Temperature resistance | -196 ℃/+450 ℃ |
| Ultimate vacuum/leakage rate | 1.0*10⁻¹¹ Torr/1.0*10⁻¹¹Pa.m³S⁻¹ |
| Baking (heating/cooling) rate | ≤3 ℃/min |
| Flange surface treatment | Electropolishing |
| Kovar alloy | 4J34 |
| Brazing materials | Silver-based alloys |
| Glass materials | Optical sapphire glass |
| Glass transmission wavelength (nm) | 190-5000 |
| Transmittance T=% | 190-240nm, T≥85%, AR coating 240-5000nm, T≥92%, AR coating |
| Glass-face PV | PV 1/2–1/20 |
| Glass surface smoothness | 80/50、60/40、20/10 |
| Non-magnetic treatment of metal parts | Demagnetization processing according to customer requirements. |
CF Sapphire Vacuum Viewport— Drawing
| Number | Specification | Glass size | glass material | Flange outer diameter | Number of bolt holes * diameter | center distance | Flange thickness |
|---|---|---|---|---|---|---|---|
| No. | Size | Glass | Material | D | N-Φd | Do | H |
| 1 | CF16 | 15.6*5 | sapphire glass | 34 | 6*φ4.3 | 27 | 12 |
| 2 | CF20 | 23.6*5 | sapphire glass | 54 | 6*φ6.6 | 41.3 | 15 |
| 3 | CF25 | 30.6*5 | sapphire glass | 60 | 6*φ6.6 | 47 | 15 |
| 4 | CF40 (CF35) | 40.6*5 | sapphire glass | 70 | 6*φ6.6 | 58.7 | 15 |
| 5 | CF50 | 51.6*5 | sapphire glass | 86 | 8*φ8.4 | 72.4 | 20 |
| 6 | CF63 | 70.6*5 | sapphire glass | 114 | 8*φ8.4 | 92.2 | 20 |
| 7 | CF80 | 85.5*6 | sapphire glass | 130 | 16*φ8.4 | 110 | 20 |
| 8 | CF100 | 92.6*6 | sapphire glass | 152 | 16*φ8.4 | 130.3 | 20 |
| 9 | CF160 | 144.6*8 | sapphire glass | 202 | 20*φ8.4 | 181 | 22 |
| 10 | CF200 | 190.6*10 | sapphire glass | 253 | 24*φ8.4 | 231.8 | 24.5 |
| 11 | CF250 | 246*12 | sapphire glass | 305 | 32*φ8.4 | 284 | 26 |
KEY FEATURES
Exceptional Hardness
Sapphire offers outstanding scratch and wear resistance for long-term durability.
Superior Pressure Resistance
High mechanical strength makes it ideal for demanding vacuum and pressure applications.
Excellent Optical Clarity
High-purity sapphire provides outstanding light transmission with minimal distortion.
Wide Spectral Transmission
Suitable for ultraviolet, visible, and infrared optical applications.
Reliable Vacuum Sealing
Precision CF flange ensures leak-tight performance for HV and UHV systems.
Custom Configurations Available
Multiple flange sizes, window thicknesses, and optical coatings available.
Custom Manufacturing Service
We provide tailor-made solutions according to drawings or technical requirements.
- Custom diameter
- Custom thickness
- Special pressure design
- Edge polishing
- Optical finishing
- OEM / ODM support
- Custom packaging
TYPICAL APPLICATIONS
- Pressure Vessels
- Chemical Reactors
- Boilers & Steam Systems
- Pipeline Sight Glass Assemblies
- Pharmaceutical Equipment
- Food & Beverage Processing
- Industrial Observation Ports
FAQ
A:Sapphire offers significantly higher hardness, greater pressure resistance, and superior mechanical durability than quartz or borosilicate glass. It is the preferred material for demanding optical and vacuum applications.
A： The CF sapphire vacuum viewport is suitable for both high-vacuum (HV) and ultra-high-vacuum (UHV) systems, with a helium leak rate of ≤1 × 10⁻¹⁰ mbar·L/s.
A: Standard sizes include CF16, CF35, CF63, CF100, CF160, CF200, and CF250. Custom flange sizes are available upon request.
A:Yes. AR coatings can be applied for specific wavelength ranges to improve optical transmission and reduce surface reflections.
A:Yes. We provide OEM and custom manufacturing based on customer drawings, including customized flange standards, sapphire thicknesses, optical coatings, dimensions, and special vacuum requirements.
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