HomeGlass Tube Adapters

Glass-to-Metal Tube Adapters

Glass to Metal Tube Adapters - Ultrahigh (UHV) High In-Vacuum (HV), drawing

Glass Tube Adapters

The process used to join 7052 borosilicate glass or 7740 Pyrex® to low-expansion NiFe alloys such as Kovar®, and/or non-magnetic 304 stainless steel, is a highly specialized technology.

Accu-Glass offers a wide selection of durable and reliable high vacuum (HV) and ultrahigh vacuum (UHV) glass-to-metal tube adapters.

Our glass tube adapters are available in rigid and flexible (with stainless steel bellows) configurations and fitted with industry standard ISO or CF vacuum flange mounts. These 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 and flexible interfaces are available.

Single-ended devices have either open or closed (domed) glass tube terminations on the end opposite the vacuum flange mount.  In-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 and LF flanges.

For more information, read the specifications below.

Glass to Metal Tube Adapter Material Specifications
  • Flange
  • Bellows
  • Tube, Metal
  • Tube, Borosilicate Glass

304 Stainless Steel
304 Stainless Steel
Kovar® or 304 Stainless Steel
7740 Pyrex® or 7052

Glass to Metal Tube Adapters Vacuum Range Specifications
Vacuum Range 
  • UHV, Ultrahigh vacuum
  • HV, High vacuum

1x10-10 Torr
1x10-8 Torr
Glass to Metal Tube Adapter Temperature Range Specifications
Temperature Range 
  • Glass to Metal Interface
  • Flange Mount, Conflat
  • Flange Mount, ISO
  • Thermal Gradient

10ºC / Minute Maximum

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