1.Covers the requirements of 3 types ( see Table 1 ) of wrought iron-nickel sealing alloys in the form of wires, rounds and strips intended primarily for sealing to glass and for other applications as mentioned in 1.1 and 1.2. Tubings are not included under the scope of this specification.
1.1 FENI 42 and FENI 48 are intended for use as glass-to-metal seals in electron tubes, semiconductor lead frames and lead wires in the manufacture of relay components, automobile lamps, bi-metallic thermostats and for shielding applications.
1.2 FENI 50 finds application in glass-to-metal seals for higher than normal thermal expansion giass as well as for glass-to-ceramic seals where thermal expansion must be almost linear up to 550°C. It is also intended to be used in hermetically sealed magnetic dry reed relays and switches.
IS 12391-1988 history
1989IS 12391-1988 Specification for iron-nickel controlled expansion seal alloys