Invar® Spooled Wire

Invar® Spooled Wire, composed primarily of 36% nickel and 64% iron, is renowned for its exceptionally low coefficient of thermal expansion, enabling dimensional stability across a wide temperature range. In wire form, it offers both mechanical flexibility and thermal stability, making it indispensable for applications in precision instrumentation, aerospace tooling, and cryogenic systems. Electrical resistance stability and durability under cyclic thermal conditions make it a preferred choice in metrology equipment, optical benches, and scientific sensors. Innovations in processing—such as controlled alloying, multi-stage cold working, and tailored heat treatments—have improved both strength and torsional properties without compromising its unique expansion behavior. Wire Arc Additive Manufacturing (WAAM) techniques are also being explored for fabricating Invar components with complex geometries directly from spooled wire, broadening its industrial relevance. In cryogenics, its measurable resistivity at low temperatures supports precision AC-based thermal property measurements. Combining unmatched thermal stability with reliable mechanical performance, Invar® Spooled Wire remains vital in sectors where precision and reliability are paramount.