Copper-Manganese
Niclal® · CuMn6Sn2, CuMn7Sn2, CuMn10Ni4, CuMn12Ni2, CuMn14Ni2
Copper-manganese alloys are resistance alloys with a controlled electrical resistance that stays stable as temperature changes, the material of shunts and precision resistors.
Alloy family
What this family is good at
A resistance that holds when temperature moves
A shunt measures a current through the voltage drop across a known resistance. If that resistance drifted with temperature, the reading would drift with it. Copper-manganese alloys are made for this job because their resistivity is highly controlled and depends very little on temperature.
That stability holds over a large temperature range, so the resistance of the finished component can be set within tight limits. Where space is short, a lower-resistivity grade lets you make the component smaller.
Where current is measured
Shunts, current-sensing resistors and precision resistors are the typical parts. Battery management systems use them to sense current in electric battery components. Grids and electrification equipment measure current the same way.
Niclal®, nine grades as strip and wire
Our catalogue files nine Niclal® grades in this family. Niclal® 28 (CuMn6Sn2) and Niclal® 29 (CuMn7Sn2) are copper-manganese-tin alloys. The other seven, from Niclal® 37 (CuMn10Ni4) to Niclal® 47 (CuMn14Ni2), add nickel to the copper and manganese.
Electrical conductivity runs from 3.6 to 6.2 % IACS across the range, the working window of a resistance alloy. Strips are supplied in the H14 temper, and Niclal® 38, Niclal® 43 and Niclal® 47 are also drawn as wires. Niclal® 43A (CuMn12Ni2) is our reference for precision resistors and shunts that need long-term stability of resistance.
Working with our engineers on a resistance element
The grades accept cold forming, stamping, welding and soldering, so the element can be shaped and joined in your process. Send us the target resistance, its tolerance and the operating temperature range of the component. We help you choose between a tin grade and a nickel grade, and we say which forms we hold in stock.
Highly controlled resistivity with very low temperature dependence, for a tight resistance on the finished component.
Nine Niclal® grades from CuMn6Sn2 to CuMn14Ni2, supplied as H14 strip and as wire.
Used for shunts, current-sensing resistors and battery-management sensing.
Range at a glance
The extent of this family's measured properties across its active variants — a range, never a single figure.
150 – 750 MPa
17/32 measured
440 – 800 MPa
6/32 measured
1 – 40 %
14/32 measured
69 HB
1/32 measured
4 – 6 %IACS
22/32 measured
8.5 – 8.9 g/cm³
27/32 measured
22 – 34 W/m·K
27/32 measured
All Copper-Manganese references
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Family highlights
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Used in
- Electronics & Connectors
- emobility
- Energy & Nuclear
Specify it with an engineer
Specify your resistance element
Send our engineers the target resistance, the temperature range and the form you need. We recommend the Niclal® grade and temper that fit your component.