Copper nickel alloys are available in a range of resistivities. They are particularly useful in low to medium temperature heating applications or where good corrosion resistance is required.
Wires are available down to 0.06mm and they may be bunched or stranded for improved flexibility.
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physical & mechanical properties
| Units | 98/02 | 94/06 | 90/10 | 85/15 | 80/20 | CONSTANTAN | |
|---|---|---|---|---|---|---|---|
| Temperature Coefficient of Resistance, 20 – 100°C | 1/K | 0.0013 | 0.0007 | 0.00063 | 0.00035 | 0.00024 | 0.00004 |
| Specific heat capacity at 20°C | kJ/kgK | - | 0.38 | 0.38 | 0.38 | 0.38 | 0.41 |
| Density at 20°C | g/cm³ | 8.9 | 8.9 | 8.9 | 8.9 | 8.9 | 8.9 |
| Coefficient of thermal expansion, 20 –100°C | 1/K x 10^6 | 17.7 | 17.5 | 17.1 | 16.9 | 16.4 | 13.5 |
| Resistivity at 20°C | µΩcm | 5 | 10 | 15 | 21 | 30 | 49 |
| Thermal conductivity at 20°C | W/mK | - | 67 | 50 | 45 | 38 | 23 |
| Typical Tensile strength - annealed * | N/mm² | 220 | 230 | 250 | 290 | 340 | 420 |
| Maximum continuous operating temperature in air | °C | 300 | 300 | 400 | 450 | 500 | 600 |
| Melting point (approx.) | °C | 1050 | 1080 | 1105 | 1115 | 1135 | 1280 |
| Typical Elongation at break - annealed * | % | >25 | >25 | >25 | >25 | >25 | >25 |
| Nominal composition | % |
Cu 98 Ni 2 |
Cu 94 Ni 6 |
Cu 90 Ni 10 |
Cu 85 Ni 15 |
Cu 80 Ni 20 |
Cu 56 Ni 44 |
* Values will vary dependant upon wire diameter
The figures given in these tables represent nominal or typical values.
Information contained within this technical data sheet is based upon the general experience of Scott Precision Wire Ltd and is believed to be correct at the time of issue.
No warranty is given or is to be implied from the details above.
Customers are advised to carry out independent tests in order to determine the suitability of any Scott Precision Wire Ltd product for an application.