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Cuprothal 49 and 49TC (Resistance heating wire and resistance wire)

Datasheet updated 2016-10-06 11:32:30 (supersedes all previous editions)

Cuprothal 49 is a copper-nickel alloy (CuNi alloy) characterized by high electrical resistance, high ductility and good corrosion resistance. It is suitable for use at temperatures up to 600°C (1110°F).

Typical applications for Cuprothal 49 are temperature-stable potentiometers, industrial rheostats and electric motor starter resistances.

The combination of negligible temperature coefficient and high resistivity makes the alloy particulary suitable for the winding of precision resistors.

Cuprothal 49 is manufactured from electrolytic copper and pure nickel. In finer wire sizes the alloy is designated as Cuprothal 49 TC.

Chemical composition

Ni % Mn % Fe % Cu %
Nominal Composition 44.0 1.0 0.5 Bal.

Mechanical properties

Wire size Yield strength Tensile strength Elongation Hardness
Ø Rp0.2 Rm A
mm MPa MPa % Hv
1.00 250 480 30 130

Physical properties

Density g/cm3 8.9
Electrical resistivity at 20°C Ω mm2/m 0.49
Temperature coefficient of resistance K-1 ± 20 ppm (wire < 0.30 mm)
± 60 ppm (wire > 0.30 mm)

Temperature factor of resistivity
Temperature °C 100 200 300 400 500 600
Ct 1.002 1.002 1.001 1.005 1.017 1.037

Coefficient of thermal expansion
Temperature °C Thermal Expansion X10-6/K
20-100 14

Thermal conductivity
Temperature °C 20
W m-1 K-1 21.0

Specific heat capacity
Temperature °C 20
kJ kg-1 K-1 0.410

Melting point °C 1280
Max continuous operating temperature in air °C 600
Magnetic properties The material is non-magnetic

Disclaimer: Recommendations are for guidance only, and the suitability of a material for a specific application can be confirmed only when we know the actual service conditions. Continuous development may necessitate changes in technical data without notice. This datasheet is only valid for Kanthal materials.

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