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KF Flanged Sapphire Viewports

KF Flanged Quartz (Fused Silica) Viewports

KF Flanged Quartz (Fused Silica) Viewports for High-Vacuum Optical Access

KF Flanged Quartz (Fused Silica) Viewports from TFM are precision-engineered for high-vacuum (HV) environments where optical access is essential. These viewports combine the high-performance properties of fused silica (quartz) lenses with KF (also known as QF) flanges, making them ideal for systems requiring reliable optical clarity, chemical resistance, and thermal stability.

The viewports are constructed from premium-grade fused silica, known for its broad transmission range from deep ultraviolet (UV) to near-infrared (NIR). This material provides low absorption and minimal distortion, supporting applications in spectroscopy, laser diagnostics, visual inspection, and other photon-based processes.

Each viewport is sealed into a KF flanged body—typically made from 304L stainless steel or aluminum—using a mechanical compression design in conjunction with a centering ring and elastomeric o-ring. This ensures a vacuum-tight connection suitable for pressures down to 10⁻⁷ Torr, depending on the o-ring material and system configuration.

For systems involving plasma processing, sputtering, or material deposition, the use of a viewport shutter is strongly recommended. Quartz surfaces can suffer from optical degradation due to deposition buildup, which may affect laser alignment or sensor readings.

Key Features of KF Flanged Quartz (Fused Silica) Viewports:

  • Vacuum Compatibility: Designed for high-vacuum environments and suitable for base pressures below 10⁻⁷ Torr.

  • Broad Spectral Transmission: Fused silica lens supports 200 nm to 2500 nm wavelength applications.

  • KF (QF) Flange Integration: Available in standard KF-16, KF-25, KF-40, and KF-50 sizes for quick and secure installation using centering rings and clamps.

  • Thermal and Chemical Resistance: Quartz lenses offer excellent resistance to temperature changes and aggressive chemical vapors.

  • Compact and Versatile: KF Flanged Quartz (Fused Silica) Viewports are ideal for use in forelines, diagnostic ports, or viewing access points in laboratory-scale vacuum setups.

Typical Applications:

  • Laser beam entry or exit points

  • Visual monitoring inside vacuum chambers

  • UV curing and photolithography systems

  • Plasma and thin-film deposition inspection

TFM’s KF Flanged Quartz (Fused Silica) Viewports offer a compact and efficient solution for achieving optical access in HV systems, where quality, reliability, and vacuum compatibility are critical. Whether you’re building a research instrument or retrofitting an industrial chamber, these viewports help ensure clarity and seal integrity under demanding conditions.

Charts

Ordering Table

KF Flanged Quartz (Fused Silica) Viewports

Drawing Flange / Mounting Window Material View Area Window Thickness Flange Material Sleeve Material Thermal Range Flatness Parallelism PartNumber
Tooltip KF25 (1.57" OD) Corning HPFS 7980 Fused Silica 0.63 0.085 304L SS 304L SS -100C to 200C λ/4 @ 632nm Transmitted Wavefront <10 Arc Seconds QF25-100-VPDU
Tooltip KF25 (1.57" OD) Corning HPFS 7980 Fused Silica 0.63 0.085 304L SS 304L SS -100C to 200C 10 Waves @ 632nm Transmitted Wavefront <30 Arc Minutes QF25-100-VPQ
Tooltip KF40 (2.16" OD) Corning HPFS 7980 Fused Silica 1.40 0.125 304L SS 304L SS -100C to 200C λ/4 @ 632nm Transmitted Wavefront <10 Arc Seconds QF40-150-VPDU
Tooltip KF40 (2.16" OD) Corning HPFS 7980 Fused Silica 1.40 0.125 304L SS 304L SS -100C to 200C 10 Waves @ 632nm Transmitted Wavefront <30 Arc Minutes QF40-150-VPQ
Tooltip KF50 (2.95" OD) Corning HPFS 7980 Fused Silica 1.40 0.125 304L SS 304L SS -100C to 200C λ/4 @ 632nm Transmitted Wavefront <10 Arc Seconds QF50-200-VPDU
Tooltip KF50 (2.95" OD) Corning HPFS 7980 Fused Silica 1.40 0.125 304L SS 304L SS -100C to 200C 10 Waves @ 632nm Transmitted Wavefront <30 Arc Minutes QF50-200-VPQ

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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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