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Magnetic Adapters (Glass to Metal)

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High (HV) and Ultrahigh (UHV) Magnetic Glass-to-Kovar Tube Adapters

The process of hermetically bonding/joining Corning 7052 (or equivalent) glass tubing to a Kovar (NiFe) tube, is a highly specialized technology. Accu-Glass offers a wide selection of durable and reliable high vacuum (HV) and ultrahigh vacuum (UHV) 7052 glass-to-metal tube adapters.

Our 7052 glass-to-metal tube adapters are available in rigid configurations and fitted with industry standard ISO or CF vacuum flange mounts. These magnetic adapters are designed for simple and reliable installation of 'tubular' laboratory glass instruments onto 'metallic' high and ultrahigh vacuum systems and/or the attachment of standard metal vacuum components onto glass laboratory apparatus. Single and double-ended flanged configurations with open, closed, rigid interfaces are available.

Single-ended devices have either open or closed (domed) glass tube terminations on the end opposite the vacuum flange mount.  Vacuum rated adapters are fitted with Conflat® compatible, metal seal CF flanges, while HV rated devices use standard, elastomer seal, quick-release ISO NW KF or LF flanges.

For more information, see specifications below.


  • Flange, 304 Stainless Steel
  • Metal Tube, Kovar (a NiFeCo Expansion matched Alloy)
  • Glass Tube, Glass / Corning 7250 Borosilicate Glass (or equivalent)

Vacuum Range

  • UHV, Ultrahigh Vacuum to 1x10E-10 Torr
  • HV, High Vacuum to 1x10E-8 Torr

Temperature Range*

  • Glass to Metal Interface, 450ºC
  • CF Flange Mount, 450ºC
  • ISO Flange Mount, 150ºC (200ºC Intermittent)
  • Thermal Gradient, 10ºC / Minute Maximum

* Overall assembly ratings must be adjusted to that of the lowest-rated component.