Hermetically sealed between glass and metal, and ceramic and metal or glass, Seal Tech products perform in the most stringent of environmental conditions with excellent insulation resistance, vacuum integrity, pressure withstanding, temperature withstanding, leak tightness and anti-corrosion materials.
All hermetic seals manufactured by Seal Tech meet or exceed the following general specification requirements:
- Temperature range: -65 °C to 350°C
- Insulation resistance: 10,000 MΩ @ 500VDC
- Hermetic (Leak rate): less than x10^-9 cc/sec
- Pressure range: one atmosphere to 65,000psi
0. Shells: mild steel, stainless steel, inconel, monel, titanium, kovar and others
0. Pins: Ni alloys, kovar , stainless steel, inconel, platinum, constantan, alumel, chromel and others
- Pin configuration: straight, bent, radiuses, headed, tube and customized
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Glass to Metal Sealing Technology
- Glass to Metal Seals
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Glass to Metal Seals
Glass to metal seals provide a way to hermetically pass an electrical conductor from one environment to another. The glass, as well as providing the seal, acts as an insulator between the pins and the housing. These conductor feedthroughs can be used for many applications such as: vacuum components, sensor or transducer housings, feedthroughs for harsh environments, battery seal headers, and medical implant devices.
Matched Seal vs. Compression Seal
Glass to metal hermetic seals available in vaious industry today are generally one of two types
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 Kovar(Ni-Co Alloy) housings and pins, and borosilicate glass.
A compression seal is made with the housing material thermal expansion rate much higher 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 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.