Hermetic Systems, LLC Glass to Metal Seal Feedthroughs

[email protected] 908-620-3300

Glass to Metal Seals

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About our Process

Hermetic Systems LLC specializes in the development, design and manufacture of highly reliable, hermetic glass-to-metal sealed feedthrough components and solutions. Our products are used in a variety of technical disciplines, including aerospace, aviation, defense, automotive, oil and gas exploration, medical, industrial process control, and commercial applications.

Equipped with advanced computer aided design software tools, Hermetic Systems can produce glass sealing beads (preforms) of various composition, which accommodate even the most demanding of sealing requirements.

Complete hermetic assemblies consisting of single and/or multiple pin arrays, precision machined metal shells, and sealing glass beads are produced in-house, using controlled non-oxidizing atmosphere exothermic gas generator (Exo-Gas) furnaces.

Hermeticity of all finished products is tested using a state-of-the-art Helium mass spectrometer leak detector, that has been calibrated to a sensitivity level of 1x10E-11 Standard cc/sec.

Components and assemblies are subjected to rigorous cleaning standards, providing ideal surface conditions for subsequent plating processes. Hi purity Copper, Gold, Nickel, Titanium, and various other base metals or precious and semi-precious materials can be applied.

All components and finished parts are 100% inspected for form, fit, and function... Including hermeticity before shipping to our customers.

Glass to Metal Seal Feedthroughs

  • Exo-gas Generator Furnace
  • Machine Shop
  • Pin Machine Shop
  • Short run and large volume production
  • High Pressure up to 65,000 P.S.I.
  • Temperature ranges from -325 F to greater than 1,000F
  • Leak rates of 1x10-11 CC/Sec.
  • Helium at a one atmosphere differential
image of various Glass to Metal Seal Feedthroughs

Total Process Control

  • Computer Aided Design
  • Glass mixing, pressing and sintering
  • Manufacture of contacts and electrodes
  • Sealing in exothermic atmosphere
  • Cleaning
  • Plating, including precious metals
  • Inspection to Mil-I-45208
a 7-pin Glass to Metal Seal Feedthrough
Oil & Gas Exploration
Industrial Process Control


  • Cold rolled Steel
  • Stainless Steel
  • Kovar
  • Inconel
  • Monel
  • Titanium
a 26-pin Glass to Metal Seal Feedthrough


  • 52 alloy
  • Kovar
  • Stainless Steel
  • Chromel / Alumel
  • Iron / Constantan
a 1-pin Glass to Metal Seal Feedthrough