This type of glass-to-metal seal can be used to feed through the wall of a metal container.

Glass-to-metal seals have been around for many years, with one of the most common uses being lamp bulb seals.

Martec's second important core activity is glass-to-metal seals.

Also the mechanical design of a glass-to-metal seal has an important influence on the reliability of the seal.

Since this element's thermal expansion is similar to borosilicate glass, it is used for making glass-to-metal seals.

The oxide film on this copper is very strongly adherent to the metal which makes it a suitable base for glass-to-metal seals.

The thermal coefficient of expansion of the glass material and metal parts must be similar to prevent breaking the glass-to-metal seal.

The first technological use of a glass-to-metal seal was the encapsulation of the vacuum in the barometer by Torricelli.

It was used as the earliest glass-to-metal seal and is still in use for liquid seals for e.g. rotary shafts.

Finally, a finned, cylindrical heat sink is attached to the anode connection (top of the tube) to provide additional cooling for the anode's glass-to-metal seal.

Kovar was invented to meet the need for a reliable glass-to-metal seal, which is required in electronic devices such as light bulbs, vacuum tubes, cathode ray tubes, and in vacuum systems in chemistry and other scientific research.

They have been used in electrical feed-through seals for such applications as vacuum interrupter envelopes and pyrotechnic actuators, in addition to many applications where a higher temperature capability than is possible with glass-to-metal seals is required, including solid oxide fuel cells.

Glass-to-metal seals are a very important element of the construction of vacuum tubes, electric discharge tubes, incandescent light bulbs, glass encapsulated semiconductor diodes, reed switches, pressure tight glass windows in metal cases, and metal or ceramic packages of electronic components.