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Standard-Length Vacuum Viewport

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Standard-Length Glass Viewports

7056 Type Borosilicate Glass

Designed for direct visual observation of processes inside a vacuum chamber — AGP standard-length vacuum viewports come fitted with Corning 7056 Type Borosilicate Glass windows, the most popular glass for the construction of vacuum-compatible viewports. They are available in either matched expansion Kovar (magnetic), or non-matched expansion 304 stainless steel (non-magnetic) transition tube configurations. Hermetically sealed using state-of-the-art glass-to-metal bonding technology, AGP glass viewports are suitable for both high and ultrahigh (UHV) vacuum applications.

Since glass is susceptible to scratching and inherently weak under point stresses, exercise extreme caution when handling glass viewports. The proper handling of glass viewports and components will minimize the chance of implosion hazard or injury.


  • Corning 7056 Type Borosilicate glass
  • Magnetic, matched-expansion Kovar transition metal
  • Non-Magnetic, non-matched-expansion 304 Stainless steel transition metal
  • High temperature rated to 350°C
  • HV and UHV compatible materials
  • Conflat CF and ISO NW compatible mounts
  • Custom Solutions on Request