Invar® Spooled Wire

Industrial Applications

Invar® Spooled Wire is used wherever wire length stability across ambient temperature fluctuations, or CTE matching to ceramics and glass in cryogenic assemblies, determines material selection:

✦ Precision Coil Springs in High-Accuracy Instruments

Used as spring wire where spring rate must remain stable across ambient temperature fluctuations. The annealed condition’s formability supports winding to tight coil geometries that disqualify conventional steel or copper-alloy spring wire in high-accuracy applications.

✦ Gravimeter Suspension Elements

Applied as suspension elements in gravimeters, where wire length stability under temperature change is directly linked to measurement accuracy and any thermally induced length change would appear as a spurious gravity signal.

✦ Pendulum Suspension Fibers in Precision Timekeeping

Used as pendulum suspension fibers in precision timekeeping instruments, where thermal length stability of the suspension element is essential to period constancy and clock accuracy.

✦ Geodetic Wire in High-Accuracy Distance Measurement

Applied in high-accuracy distance measurement, where Invar wire’s near-zero CTE eliminates the temperature correction required for conventional steel tape or wire in precision baseline measurement.

✦ Support Wire in Cryostat Assemblies

Used as support wire and connection elements in cryostat assemblies, where CTE matching to adjacent technical ceramic and glass components minimizes thermal contraction mismatch and the mechanical stresses it would otherwise generate between components.

✦ Magnetovolume Effect Research

Provides a stable, low-expansion wire substrate for electrical resistance studies and fundamental magnetovolume effect investigations in Fe-Ni alloys.