Carpenter Invar "36" alloy is a 36% nickel-iron alloy possessing a rate of thermal expansion approx. one-tenth that of carbon steel up to 200°C. This alloy has been used for applications where dimensional changes due to temperature variation must be minimized, such as in radio and electronic devices, aircraft controls, optical and laser systems, etc. This alloy has also been used in conjunction with high expansion alloys where a motion is desired when the temperature changes, such as in bimetallic thermostats and in rod and tube assemblies for temperature regulators.

Invar 36® is a registered trademark of Carpenter Technology Corporation.

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