With Fusite, mission critical is mission accomplished

When the application demands a robust electrical or signal connection—to either bridge an inert atmosphere or vacuum on one side and a wide-ranging high-pressure, high-temperature or corrosive condition on the other—for more than 70 years, Fusite’s hermetic solutions have helped customers achieve success.

Glass-to-Metal Seals


Glass-to-metal seals (GTMS) provide a way to hermetically isolate electrical conductors from one environment to another. Glass forms a hermetic barrier and acts as an insulator between the pins and housing, since glass exhibits superior dielectric or electrical insulation properties and very low thermal conductivity. GTMS enable reliable electrical power and signal transmission in harsh environments, such as high pressure or temperature excursions and exposure to corrosive chemicals.

Matched Seals

Matched hermetic seals are often used to protect microelectronic circuitry from temperature excursions and moisture incursion. During engineering, housing, pins, and glass components are chosen to have similar Coefficients of Thermal Expansion between ambient and the glass transformation point. A chemical bond between the glass and an oxide formed on the metal components contributes to the strength of the matched seal. Kovar housings and pins with borosilicate glass are typically used.

Compression Seals

Compression hermetic seals—generally made using steel or stainless steel housings, nickel iron pins, and barium alkali glasses—are specified for harsh environments. When the thermal expansion rate is higher than that of the glass, a compression seal is created. During manufacturing, the housing will contract around the glass upon solidification, generating a favorable, homogenous radial compression stress at the glass-to-metal interface, which can withstand thermal and mechanical stresses.

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