InSealing offers Fe and Feedthroughs.

  • Glass is heated to a molten state and then wetted to the metal, forming a tight bond.
  • The thermal expansion of the glass and the metal are carefully measured and controlled to prevent breakage.
  • InSealing offers not only electrical feed-throughs, the most common type we make, but also RF and microwave feedthroughs.


  • Body materials: Cold rolled steel, Stainless steel, Inconel, etc.
  • Glass Materials: Soda lime, Lead silicate, etc.
  • Electrodes Material: Alloy 52, Copper Cored 52 Alloy, Alloy 42, etc.
  • Typically Compression Seals withstand temperatures ranging from -250°C to 400°C. Allowable operating temperatures would be from -60°C to 200°C under thermal cycling and shock.


  • Hermeticity: up to 1 x 10-9 atm cc/sec He
  • Insulation resistance: typically exceeds 1 GΩ @ 100 VDC
  • Mechanical strength can withstand 20,000 psi with proper design for use in high-pressure applications
  • Dielectric: can withstand voltage depending on joint geometry and glass material selected. Below are some typical glass values

– Barium Alkali: 6.3
– Borosilicate: 4.9
– Soda Lime: 7.2


  • Gold Plating
  • Silver Plating
  • Electrolytic and Electroless Ni Plating
  • Tin Plating