Material Description

Invar, also known generically as FeNi36 (64FeNi in the US), is a nickel–iron alloy notable for its uniquely low coefficient of thermal expansion (CTE or α). The name Invar comes from the word invariable, referring to its relative lack of expansion or contraction with temperature changes. It possesses a rate of thermal expansion approximately one-tenth that of carbon steel. 

Application

• Precision instruments: Such as stencils, fine line etching, and laser cutting

• Optical devices: Such as clock pendulums, which were one of the first uses of Invar due to its ability to keep accurate time

• Electronics: Such as radio and electronic devices, echo boxes and filters for mobile telephones, and electrical circuit breakers and transformers

• Aerospace: Such as composite molds, aircraft controls, and large aerostructure molds

• Other industries: Such as defense, medical equipment, scientific instruments, and tooling and dies 

Chemical Composition