Invar 36 (FeNi36) / 1.3912

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Frequently Asked Questions About Invar

What is Invar® used for?

Due to its low rate of thermal expansion (the lowest thermal expansion of any known alloy), this controlled expansion alloy is used in measurement and electronic devices where dimensional changes due to temperature must be minimal. Invar® is also used in composite molds for the aerospace industry, bimetal thermostats, clock balance wheels, containers and transfer lines for LNG tankers, echo boxes and filters for mobile telephones, electrical circuit breakers & transformers, electron gun components, high voltage transmission lines, laser components, magnetic shielding, radar and microwave cavity resonators, scientific instruments, as well as shadow masks, deflection clips, and electron gun components in CRT applications, and many other applications.

Is Invar® magnetic?

Yes, Invar® is a magnetic alloy with a composition of 36% nominal nickel and the balance iron.  Iron, nickel, and cobalt are elemental metals that are magnetic below their Curie points. Alloys can be magnetic if they contain these elements. However, Invar® is not used for its magnetic properties. It is used for its low expansion characteristics, the lowest of any known alloy (approx. one-tenth of carbon steel at temps up to 400°F). Invar® is particularly useful in applications that require minimum thermal expansion and high dimensional stability.

What is Kovar® and Invar®?

Kovar® and Invar® are two controlled expansion alloys. Both alloys are iron-nickel alloys; however, Kovar® also includes cobalt. Both alloys are used for their thermal expansion characteristics. Kovar® particularly so for its expansion properties so closely match borosilicate (Pyrex) glasses and ceramic materials. Invar® is distinguished by its having the lowest thermal expansion of any known alloy and its high dimensional stability.

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