Data Sheet: Copper-Manganese-Nickel Alloys

Learn more about each nickel speciality alloy

  • Nickel Manganese Copper Low Resistance and Shunt Alloy Grades

Copper-Manganese-Nickel Alloys: Wire / Strip

JLC Mang series is of copper-nickel alloys that are used for electrical and controlled resistance applications. These alloys have very low temperature coefficient of resistance, and offer uniform electrical resistance over long periods of time. Additionally, they have very low thermal electromotive force (EMF) against copper. These alloys have good workability, can be soldered, as well as welded.

In addition to the two grades listed below, other variants of copper-nickel alloys are also available. Please contact JLC for more details.


Alloy British Standard Werkstoff Nr UNS designation
JLC Mang 38 - - -
JLC Mang 43 - 2.1362 -

Nominal Chemical Composition (%)

Alloy Ni Mn Cu
JLC Mang 38 2 - 4 10 - 12 Balance
JLC Mang 43 2 - 4 11 - 13 Balance

Physical Properties (at room temperature)

Alloy Density Specific Resistance 
(Electrical Resistivity)
Thermal Linear
Expansion Coeff.
between 20-1000 °C
Temp. Coeff.
of Resistance
Thermal EMF against
Copper at 20°C
g/cm³ µΩ-cm 10-6/°C x 10-6/°C µV/K
JLC Mang 38 8.40 38.5 18 ±15 (Range 40-60 °C)  
JLC Mang 43 8.41 43.0 18 ±15 (Range 15-35 °C) Standard: -1.00;
Special ±0.20

Mechanical Properties (for cold drawn annealed wire)

Alloy Tensile strength
% at L0=100 mm
Min Max Min Max
JLC Mang 38 350 450 15 30
JLC Mang 43 350 450 15 30

Size Range

Form Dia Width Thickness
mm mm mm
Wire 12.0 - 0.15 - -
Strip - 0.4 - 80 ≥ 0.10


These alloys are used for manufacturing resistance standards, precision electrical measurement instruments such as potentiometers, and are standard materials for precision, standard, and shunt resistors. Due to their low EMF against copper, they are used in electrical circuits where an erratic thermal EMF can lead to malfunctioning of the circuit.

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Related Links


Nickel Alloys

Standard Nickel Grades:

Nickel-Manganese Alloys:

Nickel-Copper Alloys:

Welding Alloys Heating & Resistance

Nickel-Chromium Alloys:

Iron-Chrome-Aluminum Alloys

Nickel Chrome Iron Alloys Low Resistance & Shunt Alloys

Cu-Ni Low Resistance Alloys:

Cu-Mn-Ni Alloys:

Lamp Components & Alloys Thermocouple Alloys

Thermocouple Grade Alloys:

Extension and Compensating Grade Alloys:

Automotive Alloys

Alloys for Earth and Central Electrodes:

  • NiSi
  • NiCr15Fe
  • NiCr5SiMn
  • NiCr2SiMn
  • NiSi1Al1Y
Soft Magnetic Alloys

Temperature Compensating Alloys:

  • Ni30Fe
  • Ni31Fe
  • Ni32Fe

High Permeability Alloys:

  • SMA 50 (Ni50Fe)
Controlled Expansion Alloys
Dumet Wires
Clad Wires
  • Copper-Clad FeNi42
  • Copper-Clad FeNi60
  • Iron-Clad Nickel
  • Nickel-Clad Iron