Grade : Invar/ Vacodil36/ FeNi36

Classification : low coefficient of thermal expansion alloy
Application: Invar is used where high dimensional stability is required, such as precision instruments, clocks, seismic creep gauges, television shadow-mask frames, valves in motors, and antimagnetic watches. In land surveying, when first-order (high-precision) elevation leveling is to be performed, the leveling rods used are made of Invar, instead of wood, fiberglass, or other metals. Invar struts were used in some pistons to limit their thermal expansion inside their cylinders.

Invar's Curie point is 230 degrees Celsius, below the temperature of the alloy is ferromagnetic and has a very low coefficient of expansion, higher than the temperature of the alloy is non-magnetic, expansion coefficient increases. 
This alloy is mainly used in the manufacture in the temperature range approximately constant element size, It is widely used in the radio industry, precision instrument manufacturing

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