A true glass-to-metal seal is defined as one in which inorganic glass is heated to the point where intimate contact (“wetting”) is attained upon a hot metal surface and is retained when the glass and metal are cooled to room temperature. The glass and metal components usually have similar Expansion coefficients and rates of expansion.
The glass layer is electrically insulated. Its resistance depends on the types of the glass, the temperature, and the condition of the surface. On the other hand, glass can be given a metallic oxide coating that conducts electricity. The glass can perform under high pressure, vacuum, high temperature, thermal cycling, radiation, shock and vibration, totally inorganic. They will not degrade with time.
Stay tuned for the Glass-to-Metal Seals series of blogs
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