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CF Flanged Kodial Glass Viewports

CF Flanged Kodial Glass Viewports

CF Flanged Kodial Glass Viewports for Ultra-High Vacuum Optical Access

CF Flanged Kodial Glass Viewports from TFM are precision-crafted for demanding ultra-high vacuum (UHV) environments, offering clear optical access for a wide array of scientific and industrial applications. These zero-length viewports are engineered to ensure minimal trapped volume and particulate contamination, making them ideal for spectroscopy, laser interaction, and plasma diagnostics.

Each viewport is constructed using fully annealed Kodial 7056 glass, an alkali borosilicate material known for its excellent thermal stability, optical clarity, and chemical resistance. This optical disc is fused to the CF (ConFlat®) stainless steel flange using a Kovar® transition ring, ensuring thermal compatibility between dissimilar materials and maintaining a leak-tight seal under repeated thermal cycling.

The CF flanged interface is vacuum-tight and supports fully annealed copper gaskets for reliable, knife-edge sealing. These viewports are designed to operate at bakeout temperatures up to 350°C, provided the heating rate does not exceed 2–3°C per minute. This makes them highly compatible with UHV chambers, beamline systems, and semiconductor tools where both cleanliness and precision are paramount.

Key Features of CF Flanged Kodial Glass Viewports:

  • UHV-Ready: Designed to maintain integrity in ultra-high vacuum conditions, supporting pressures down to 10⁻¹⁰ Torr.

  • Optically Distortion-Free: Provides a large, clear viewing area with minimal internal voids or trapped volume.

  • Kodial 7056 Glass: Commercial-grade, fully annealed alkali borosilicate offering excellent transparency and thermal resistance.

  • Kovar Metal Transition Ring: Ensures secure, stress-free bonding between the glass and CF flange.

  • High-Temperature Compatibility: Bakeable to 350°C, with a gradual ramp rate for optimal longevity and seal performance.

Common Applications:

  • Laser entry/exit ports in UHV beamlines

  • Visual access for semiconductor processing chambers

  • Spectroscopy and ellipsometry in analytical systems

  • Observation windows for plasma, ion, or thin-film processes

  • Optical access in synchrotron or fusion research setups

TFM’s CF Flanged Kodial Glass Viewports represent the ideal choice for professionals requiring optical reliability and vacuum integrity in critical UHV environments. Whether for research laboratories or industrial instrumentation, these viewports are designed to meet the most stringent performance expectations.

Charts

 

Ordering Table

Drawing Flange / Mounting Window Material View Area Window Thickness Flange Material Sleeve Material PartNumber
Tooltip DN16CF (1.33" OD) Kodial 0.63 0.060 304L SS Kovar VPZL-133
Tooltip DN25CF (2.13" OD) Kodial 0.63 0.060 304L SS Kovar VPZL-212
Tooltip DN35CF-DN40CF (2.75" OD) Kodial 1.50 0.120 304L SS Kovar VPZL-275
Tooltip DN50CF (3.38" OD) Kodial 1.90 0.140 304L SS Kovar VPZL-337
Tooltip DN63CF (4.50" OD) Kodial 2.56 0.140 304L SS Kovar VPZL-450
Tooltip DN75CF (4.63" OD) Kodial 2.56 0.140 304L SS Kovar VPZL-463
Tooltip DN100CF (6.00" OD) Kodial 3.54 0.240 304L SS Kovar VPZL-600
— DN125CF (6.75" OD) Kodial 3.54 0.240 304L SS Kovar VPZL-675
Tooltip DN160CF (8.00" OD) Kodial 5.32 0.320 304L SS Kovar VPZL-800
Tooltip DN200CF (10.00" OD) Kodial 5.32 0.320 304L SS Kovar VPZL-1000

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FAQ

Tube fittings are designed for tubes (measured by outside diameter and wall thickness) used in high-pressure and instrumentation applications, whereas pipe fittings are for pipes (identified by nominal pipe size) primarily used in fluid transport.

 

Common valve types include ball valves, gate valves, check valves, butterfly valves, and globe valves. Each serves a specific function—from quick shutoff (ball/gate valves) to flow regulation (globe valves).

 

  • For tubing, measure the outside diameter; for pipes, refer to the nominal pipe size (using conversion charts if needed). Always match the valve or fitting size to your pipe’s dimensions and flow requirements.

  • Frequently used thread types include NPT (National Pipe Tapered), BSP (British Standard Pipe), and UNC, along with slip-fit options that rely on compression or fusion rather than threads.

Interchangeability depends on manufacturer specifications and certification. Always verify compatibility via manufacturer guides or certified interchangeability charts.

 

  • A coupling is a short, straight fitting used to join two pipes or tubes. It provides a secure, leak-tight connection and can sometimes serve to extend or repair piping runs.

Consider valve type, pressure and temperature ratings, material compatibility with your fluid, actuation method (manual or automatic), and maintenance requirements.

 

  • Valves regulate flow by opening, closing, or partially obstructing the pathway. Their mechanisms (such as the rotation of a ball or the linear movement of a gate) determine the speed and precision of flow control.

  • A flange is a flat, circular component used to connect pipes, valves, or other equipment. Bolted together with gaskets, flanges provide a secure, leak-proof joint that facilitates both assembly and maintenance.

  • Manual valves require physical operation via handles or levers, whereas actuated valves use mechanisms—pneumatic, electric, or hydraulic—to open and close automatically or remotely.

  • Issues include leaks caused by improper installation, over-tightening, degraded seals, material incompatibility, and fatigue from repeated cycling. Regular inspection and proper installation practices help mitigate these problems.

Regular maintenance involves periodic inspections, cleaning or replacing worn seals, ensuring proper torque during installation, and adhering to manufacturer guidelines and local plumbing codes to preserve system integrity.

 

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