Is Invar a Ceramic?

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).

What is Invar made of?

Invar, alloy of iron that expands very little when heated; it contains 64 percent iron and 36 percent nickel. Invar was formerly used for absolute standards of length measurement and is now used for surveying tapes and in watches and various other temperature-sensitive devices.

Is Invar ferromagnetic?

Because the classic Invar alloys are ferromagnetic at room temperature, their dimensions are sensitive to a magnetic field. For applications where this is a problem, antiferromagnetic Cr-based Invar alloys have been intensively studied.