Glass-to-Metal Sealing Technology (GTMS)
Our GTMS products can be broadly divided into two types, matched seals and compression seals.
- Matched Seals
The matched seal type is designed to seal Fe-Ni-Co alloy (Fe: 54%, Ni: 28%, Co: 18%), known as Kovar (KV for short), with glass. The thermal expansion coefficient of Kovar synchronizes with that of glass over a wide range of temperatures.
The matched seal type can be used to make a variety of terminals with comparatively few restrictions on the terminal shape. At the same time, it provides high air-tightness and electrical insulation.
Glass: Borosilicate glass (categorized as hard glass)
- Compression Seal
The compression seal is designed to exert concentric compressive stress on the glass in the available temperature range, while considering the thermal expansion coefficients of the metal and glass.
In general, there are three different types of compression seals, namely seals with steel or stainless steel housings, iron seals and #42-alloy seals.
For more information regarding our GTMS/SCHOTT CerTMS®
products, please download our catalog from our download page
Advantages of the Technology
- Effective hermeticity
- Resistance in harsh environments e.g. against corrosive materials, vibrations, serious temperature fluctuations
- Long-term, reliable protection of the packaged component
They have proven successful in electronic and electrical engineering and cover a wide range of applications in which the sealing glass serves as an excellent insulator.