<P> 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 . </P>
<P> 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 . </P>
invar tapes are made of an alloy of
invar tapes are made of an alloy of
nickel -- iron
nickel -- iron