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KF Flanged Sapphire Viewports

KF Flanged Sapphire Viewports

KF Flanged Sapphire Viewports: Durable Optical Access for High Vacuum Systems

KF Flanged Sapphire Viewports from TFM are engineered to provide superior optical clarity, mechanical strength, and vacuum integrity for applications operating in high vacuum (HV) and ultra-high vacuum (UHV) environments. These viewports combine a standard KF (QF) flange with a high-purity sapphire window, delivering a robust solution for demanding optical tasks where thermal stability and abrasion resistance are essential.

Built with premium-grade materials and designed for compatibility with vacuum systems capable of achieving high vacuum levels, these viewports are ideal for use in plasma systems, spectroscopy, optical diagnostics, and reactive gas environments.

Key Features of KF Flanged Sapphire Viewports:

  • UHV-Grade Material Construction: Each KF Flanged Sapphire Viewport is crafted using 304L stainless steel and a precision-sealed sapphire window, ensuring low outgassing and reliable performance in controlled environments.

  • High Strength and Thermal Resistance: Sapphire offers exceptional hardness and thermal conductivity, making it resistant to thermal cycling, scratching, and aggressive process gases—ideal for long-term use in HV and UHV systems.

  • Standard KF Flange Integration: The viewport uses a KF (QF) flange for quick, secure installation into standard vacuum plumbing systems, providing a universal interface for a wide range of setups.

  • Superior Optical Performance: Sapphire delivers high optical transmission from UV to mid-infrared wavelengths, ensuring accurate measurements and clear visualization during experiments or production processes.

Applications of KF Flanged Sapphire Viewports:

  • Optical access in HV/UHV plasma chambers

  • Laser diagnostics and beam delivery systems

  • Spectroscopy and imaging under vacuum

  • Monitoring corrosive or abrasive processes

TFM’s KF Flanged Sapphire Viewports are designed to withstand the mechanical and chemical rigors of advanced vacuum environments. With their excellent optical clarity, rugged construction, and high vacuum compatibility, they provide a long-lasting solution for researchers and engineers requiring precision and durability.

Charts

Ordering Table

Drawing Flange / Mounting Window Material View Area Window Thickness Flange Material Sleeve Material Thermal Range Parallelism Surface Finish Transmission Orientation PartNumber
Tooltip KF16 (1.18" OD) UV Sapphire 0.60 0.062 304L SS Kovar -100C to 450C <3 Arc Minutes 50/20 Scratch-Dig 50%@250nm (External) 0-90 Deg QF16-075-VPS
Tooltip KF25 (1.57" OD) UV Sapphire 0.60 0.062 304L SS Kovar -100C to 450C <3 Arc Minutes 50/20 Scratch-Dig 50%@250nm (External) 0-90 Deg QF25-100-VPS
Tooltip KF40 (2.16" OD) UV Sapphire 0.94 0.080 304L SS Kovar -100C to 450C <3 Arc Minutes 50/20 Scratch-Dig 50%@250nm (External) 0-90 Deg QF40-150-VPS
Tooltip KF50 (2.95" OD) UV Sapphire 0.94 0.080 304L SS Kovar -100C to 450C <3 Arc Minutes 50/20 Scratch-Dig 50%@250nm (External) 0-90 Deg QF50-200-VPS

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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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