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Sealtech catalogue

TECHNOLOGY

TECHNICAL INFORMATION

What are our technologies?

SEALTECH has advanced technologies of hermetic seals, Glass/Ceramics to Metals, Metalized ceramics and Brazing, etc. SEALTECH products hermetically sealed between glass and metal, and ceramic and metal or glass, perform in the harsh environments with excellent insulation resistance, high vacuum, pressure withstanding, temperature withstanding, leak tightness and anti-corrosion.

General Specifications

All hermetic seals manufactured by SEALTECH meet or exceed the following general requirements.

  • Temperature range : -55 °C to 250°C
  • Insulation resistance : 10,000 MΩ @ 500VDC
  • Hermetic (Leak rate : less than x10^-9 cc/sec
  • Pressure range : one atmosphere to 65,000psi
  • Material : * Base/Housing --> mild steel, stainless steel, inconel, monel, titanium, Ni Alloys, kovar and others
  • Material : * Pins --> Ni alloys, kovar , Mo, W, stainless steel, inconel, platinum, constantan, alumel, chromel and others
  • Pin configuration : straight, bent, round & nail headed, tube and customized

What is GTM Sealing technologies?

GTM Sealing refers to a technology of sealing and fusion bonding glass(ceramics) to metals at high temperatures. Glass-to-metal seals provide a way to hermetically pass an electrical conductor from one environment to another. The glass not only provides sealing but acts as an insulator between pins and housing which protect devices and transmit signals in the harsh environments. These conductor feedthroughs can be used for many applications such as: vacuum components, sensor or transducer housings, feedthroughs, etc.

Type of GTM Sealing

Today, Glass to Metal hermetic seals available in various industries are generally divided by two types. These are matched seal (parts with similar coefficients of thermal expansion) and unmatched seals (parts with different coefficients of thermal expansion).

  • Matched Seal

    To create a matched seal, housing and glass materials are selected to have similar coefficient of thermal expansion. The strength of a matched seal comes primarily from a chemical bond between the glass and an oxide formed on the metal parts. Matched seals are most often made with Ni alloy, Kovar(Ni-Co Alloy) housings and pins, and borosilicate glass.

  • Unmatch Seal(Compression Seal)

    A unmatched(compression) seal is made of a much higher thermal expansion rate of housing material than that of the glass. Upon solidification of the seal during the manufacturing process, the housing will contract around the glass, applying a desirable compression stress on the glass bead. The during the manufacturing process, the housing will contract around the glass, applying a desirable compression stress on the glass bead. The strength of the glass to metal seal is reinforced mechanically as well as chemically, creating a stronger, more reliable part. Compression seals are often made using steel or stainless steel housings,nickel iron pins, and barium alkali glass.

Application of GTM Seal

  • Optical communication module : Optical transducer, TX/RX Module, Photodiode, TOSA, ROSA, etc.
  • Automotive : LADAR, gas sensor, pressure sensor, temperature sensor, humidity sensor, laser sensor, etc.
  • Aerospace and defense industries : high vacuum feed-throughs, hermetic connectors, micro-integrated packages, RF high-frequency packages, infrared detectors, etc.
  • Medical equipment and medical use : vacuum tube, thermopile sensor, pressure sensor, temperature sensor, humidity sensor, ultraviolet sensor, infrared sensor, etc.
  • High vacuum equipment : high vacuum feedthrough, hermetic connector, power feedthrough, hermetic terminal, etc.
  • Energy : Lithium Battery Header