Invar 36 is a nickel-iron, low expansion alloy that contains 36% nickel and possesses a rate of thermal expansion approximately one-tenth that of carbon steel. Alloy 36 maintains nearly constant dimensions over the range of normal atmospheric temperatures, and has a low coefficient of expansion from cryogenic temperatures to about 500°F. This nickel iron alloy is tough, versatile and retains good strength at cryogenic temperatures.

Invar 36 is used mainly for:

• Aircraft controls
• Optical & laser systems
• Radio & electronic devices
• Composite forming tools & dies
• Cryogenic components