The material: 'Constantan® Resistance Alloy Foil' you were looking for has been superseded by the one below.

Constantan® Resistance Alloy Foil

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Constantan is a copper-nickel alloy. It is manufactured under close control from electrolytic copper and pure nickel, and it is available in the form of a foil.

This material data has been provided by Matmatch.

All metrics apply to room temperature unless otherwise stated. SI units used unless otherwise stated.
Equivalent standards are similar to one or more standards provided by the supplier. Some equivalent standards may be stricter whereas others may be outside the bounds of the original standard.

Ashby charts





23.0 °C

8.9 g/cm³

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Tensile strength

23.0 °C

480 MPa

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Coefficient of thermal expansion

200.0 °C

1.45E-5 1/K

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Melting point

1225 - 1300 °C

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Specific heat capacity

23.0 °C

395 J/(kg·K)

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Thermal conductivity

100.0 °C

25.3 W/(m·K)

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Electrical resistivity

23.0 °C

5.2E-7 Ω·m

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Temperature coefficient of resistance

23.0 °C

2E-5 1/K

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Chemical properties



45 %

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55 %

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Technological properties

Application areas

It is an ideal alloy for winding heavy-duty industrial rheostats and electric motor starter resistances. High specific resistance, together with good ductility and resistance to corrosion are all-important requirements in the category, and Constantans satisfies the most demanding specifications. It is commonly used as a thermocouple alloy, in conjunctions with copper up to 400 °C and with iron up to 800 °C. In addition, it is used in precision resistors, temperature stable potentiometer, volume control devices and strain gauges. In the resistor field, its high resistance and negligible temperature coefficient of resistance are its main attractions.