glass-to-metal seal


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glass-to-metal seal

[¦glas tə ¦med·əl ′sēl]
(electronics)
An airtight seal between glass and metal parts of an electron tube, made by fusing together a special glass and special metal alloy having nearly the same temperature coefficients of expansion.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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Glass-to-metal seal prevents normal dry-out of the capacitor electrolytic
* Elimination of glass-to-metal seals which are typically the weakest link of an HID lamp
Depending on the application, glass-to-metal seals may also incorporate other special-purpose materials.
For example, top quality laser welding of enclosures and high-end glass-to-metal seals are required to ensure that Li-[SOCl.sub.2] batteries remain hermetically sealed for a lifetime.
Sealing can be accomplished by using O-rings, epoxy seals and glass-to-metal seals. Seals can easily withstand air pressures of 100 psi+ of pressure and helium leak rate of <1 X 10-8 cc/second of helium tracer gas.