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Constantan® Resistance Alloy Foil

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Description

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

Properties

General

PropertyTemperatureValue

Density

23.0 °C

8.9 g/cm³

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Mechanical

PropertyTemperatureValueComment

Tensile strength

23.0 °C

480 MPa

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annealed

Thermal

PropertyTemperatureValue

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

PropertyTemperatureValue

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

PropertyValue

Chromium

45 %

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Copper

55 %

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Technological properties

Property
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.