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CF-Flanged, Magnetic Standard Length Viewports

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CF Flange, UHV Standard-Length Viewports

Magnetic / Corning 7056 Borosilicate Glass

Accu-Glass’ Borosilicate glass viewports are ideal for general purpose use such as the direct observation of processes inside a vacuum chamber. The window material is a Corning 7056 type Borosilicate glass — one of the most common materials used in the construction of vacuum viewports. Our viewports are designed and built for both high and ultrahigh vacuum applications and employ the latest in glass-to-metal bonding technology to hermetically seal Borosilicate glass to nickel-iron alloy sleeves. Since glass is susceptible to scratching and inherently weak under point stresses, caution must always be exercised when handling these viewports. Proper handling of glass viewports and components will greatly minimize the chance of implosion hazard.


  • Corning 7056 Borosilicate glass
  • Nickel-Iron alloy low-expansion sleeve
  • High temperature rated to 350°C
  • UHV compatible construction
  • Conflat® and ISO NW compatible mounts
  • Stainless steel and NiFe construction
  • Custom Solutions on Request

7056 Borosilicate glass substrate transmission curve graph