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NILO is a nickel-iron alloy with a low expansion coefficient. The alloy also executes good ductility and toughness. The amount of nickel in the various grades of NILO varies. NILO is available commercially in grades such as NILO 36, NILO 42, NILO K and NILO 48.
NILO K consists of 29% nickel, and 17% cobalt along with its iron content. The alloy is capable of forming into wires, sheets, plates, wires, and more. The coefficient of expansion of this alloy is similar to that of borosilicate glass. NILO K also has magnetic properties that form due to heat treatment. NILO 42 has 42% nickel and also has a constant coefficient of thermal expansion. NILO K is used in integrated circuit lead frames and glass to metal seals. NILO 42 is used in applications such as Bi-metal thermostat strips, ceramic-to metal seals, semiconductor lead frames in integrated circuits, and glass to metal seals. NILO 48 consists of 48% nickel and has a coefficient of expansion similar to that of soft lead and soda-lime glass. It is used in incandescent light bulbs, industrial thermostats, and radio valves. NILO 36 has 36% nickel and is capable of retaining its dimensions in a wide range of temperatures. NILO 36 is used in cryogenic and laser components.