Resistance Wire Material Specifications Omega Resistance Wire deliver high quality materials in various forms, if you need help or want to place and order our dedicated team are waiting to assist you.

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Material Specifications

Omega Resistance Wire manufactures resistance wire from a variety of specialised materials – which can be grouped under the following principal headings - Nichrome, Cupro nickel, Iron Chrome Aluminium and Nickel Iron. Within these material groups, there is a wide range of alloys, each developed for a specific application. Refer to the table below for material specifications and typical applications.

The materials outlined below represent the most common alloys for each material group, and will be the alloy of choice for the majority of resistance wire applications. However, other resistance alloys are also available in stock, so please contact us if the material you require is not shown.

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  Resistivity µΩ/cm Density g/cm³ Coeff. Linear Exp. µm/m°C
(20 - 1000c)
Max Op. Temp. °C Service Properties & Applications
Nickel Chrome
80/20 108 8.35 17.5 1150 Contains long life additions making it suitable for applications subject to frequent switch and wide temperature fluctuations. Control resistors, high temperature furnace, soldering irons.
60/16 112 8.16 17.5 1100 Balance mainly iron and long life additions. Suitable for less exacting applications. Electric heaters, furnaces.
37/18 105 7.95 18.0 1050 Balance mainly iron. Used in furnaces with atmospheres which may otherwise cause dry corrosion for higher nickel content materials. Electric heaters and furnaces.
Copper Nickel
CuNi 44 49 8.90 14.0 400 Medium resistivity and low temperature coefficient of resistance make it ideal for resistors. Also thermocouples, heating wires.
CuNi 30 37 8.90 15.7 500 High resistance to oxidation and chemical corrosion. Resistors, cables, detectors for fuses.
CuNi 6 10 8.90 16.2 300 Characterised by low resistivity. High resistance to oxidation and corrosion. Tube electrical welding fittings, ribbons for bi-metals.
Iron Chrome Aluminium
ICA 135 135 7.25 14.0 1300 Ferromagnetic alloy should be used in dry environment to avoid corrosion. Can become embrittled at high temperatures. Furnace heating elements.
ICA 145 145 7.10 15.1 1350 As for ICA 135, but operates at higher temperatures. Furnace heating elements.
Nickel Iron
Ni 42 63 8.12 5.3 - 8.0 300 A low and constant expansion factor up to 300°C enables use in high temperature thermostats. Glass to metal seals, thermostat rods.
Ni 48 41 8.20 8.7 - 10.3 450 Coefficient of expansion approximately equals that of soft glasses of soda lime and lead oxide types. Glass to metal seals.
Ni 52 43 8.25 10.1 - 10.7 450 A controlled expansion alloy particularly suitable for seals with soft glasses. Glass to metal seals.
NiFeCo 49 8.36 5.3 - 6.2 400 A very low coefficient of expansion closely matches medium hard boro-silicate glasses. High performance glass to metals seals.
Nickel Alloy
200 9.6 8.90 13.3 325 Commercially pure nickel. Good mechanical and corrosion resistance properties. Components for electrical and chemical industries.
212 10.9 8.86 12.9 325 Increased heat resistance due to addition of manganese. Component in bulbs and electron tubes, lead wiring.

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