It is used mainly for its medium range electrical resistivity and very low temperature-coefficient of resistance.

Constantan Wire (A Nickel-Copper alloy wire) is used mainly for its medium range electrical resistivity and very low temperature-coefficient of resistance.Applications include power resistors, shunts, thermocouples and wire-wound precision resistors having operating temperatures up to 400oC (750oF).

Approximate Chemical Composition
Ni	45%
Cu	55%

Properties
DENSITY	8.89 g/cm3
ELECTRICAL RESISTIVITYAT 20 oC (microhm • cm)AT 20 oC (ohm. Circ. Mil/ft)	49295
MAXIMUM OPERATING TEMPERATURE	400 oC	750 oF
MELTING POINT	1270 oC	2320 oF
COEFFICIENT OF EXPANSION	14.7 µm/m °C (20 - 100°C)