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Ceramic Vacuum Breaks and Isolators

Electrical Breaks / Isolators - Ultrahigh (UHV) High In-Vacuum (HV), drawing

High (HV) and Ultrahigh (UHV) Ceramic Breaks / Isolators

Accu-Glass Products Inc. offers a complete line of ultrahigh (UHV) electrical vacuum breaks/isolators designed for vacuum applications requiring an "electrical isolator" from the rest of the vacuum chamber.  The central ceramic tube provides electrical isolation between the conductive metal ends.  If the breaks are used between two rigid components, a bellows should be used in the system to reduce mechanical stress that may cause the ceramic to break.

Accu-Glass Products ceramic vacuum breaks are all suitable for service in ultrahigh vacuum environments. 

All vacuum breaks are bakeable to 450ºC for the short term.  Long term will cause oxidation of the metals exposed to air.

Vacuum Breaks

Cryogenic and in-vacuum breaks consist of ceramic insulating tubes with metal tubes brazed to each end and welded to ISO for High Vacuum (HV) or CF flanges for UHV service.   Cryogenic and vacuum breaks are not suitable for water service because of corrosion, while water and vacuum breaks are not suitable for cryogenic service because of expansion differentials and material embrittlement.

Fluid Break

Water vacuum breaks consist of ceramic tubes brazed to copper tubes that can be easily brazed to existing copper tubes.


The links above provide access to our line of cryogenic breaks, vacuum electrical isolator, and water breaks/isolators. Specifications are detailed below.


Vacuum Break Specifications
  • Voltage, Maximum

See each individual item
Vacuum Break Material Specifications
  • Tube (Weld Ends)
      Vacuum / Cryogenic
  • Ceramic Insulator
      Vacuum, Water, Cryogenic

304 Stainless Steel


Vacuum Break Range Specifications
Vacuum Range  
  • UHV, Ultrahigh vacuum
  • HV, High vacuum

1x10-10 Torr
1x10-8 Torr
Vacuum Break Temperature Range Specifications
Temperature Range  
  • Cryogenic
  • Water
  • Vacuum
      CF Flange
      ISO Flange
  • Thermal Gradient

-200ºC to 400ºC
0ºC to 450ºC

-55ºC to 450ºC
-25ºC to 200ºC
25ºC / Minute Maximum

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