South Source Core provides various custom glass to metal hermetic seals, including seals providing power or transmitting signals in all sealed containers. The seals produced by us can mainly satisfy the requirements on air tightness, resistance to pressure and insulativity.
The glass to metal hermetic seals are mainly applied in sealed containers as power input accessory for motor and some other parts requiring power. They can also be used for signal transmission under high pressure and extreme temperature in the sealed container. The glass to metal hermetic seal features good air tightness, good insulation, good resistance to high pressure, good resistance to extreme temperature and some other advantages. The normal applications are hermetic terminals on refrigerator and compressor of air conditioner, hermetic terminal plates on commercial air conditioner, sensor connector, sight glass etc.
South Source Core can design proper products for our customers according to the specific requirements of them such as magnitude of the conduction current, magnitude of applied voltage, application environment, installation size etc.
The materials adopted to produce glass to metal hermetic seals are usually decided according to the custom requirements of our customers. The expansion factors of the selected glass and metal materials are carefully matched so that there will not be performance degradation of the metal material after sintering. The metal still features the following advantages: good elasticity, plasticity, rigidity, aging sensitivity, intensity, hardness, impact toughness, fatigue strength and fracture toughness etc.
Glass material: high temperature and superior glass insulator from U.S.A and Japan;
Metal material: carbon steel, stainless steel, Kovar alloy, 52 alloy, 4J28.
The glass to metal hermetic seals are mainly produced by compression seals technique. The expansion factor of glass and metal are not the same, so the contraction of the metal is larger than glass when cooling down during sealing in. So there will be compressive stress on glass from metal. Thus, the sealing in can be accomplished. The seals produced by this process feature good air tightness and electrical property.
The surface treatment of glass to metal hermetic seals adopts advanced electroless Ni plating process. The produced seals feature salt fog resistance which is over 48H. And there will be no peeling of plating during bending of the seals, so the glass will not be polluted. And the electrical property is quite good. The surface can also be treated by electroless silver or gold plating according to customers’ requirements.Product performance