Glass Sealing 42

Glass Sealing 42 is a 41% nickel-iron controlled expansion alloy used in a wide variety of glass-to-metal sealing applications. While the expansion properties of this alloy most closely match 1075 glass, it has also been used in seals for the 0120 and 0010 glasses. It may also be used with hard glasses if a thin edged tubular seal is utilized. For seals that are not hydrogen annealed prior to sealing, a variation of this alloy containing small additions of titanium, Glass Sealing 42 Gas-Free, promotes gas-free sealing characteristics.