Properties of Cu and AlCopper(CW004A)Aluminium (1350)UnitsElectrical conductivity (annealed)10161% IACSElectrical resistivity (annealed)1.722.83μΩ cmTemperature coefficient of resistance(annealed)0.00390.004/° CThermal conductivity at 20°C397230W/mKCoefficient of expansion17 x 10–623 x 10–6/° CTensile strength (annealed)200 – 25050 – 60N/mm2Tensile strength (half–hard)260 – 300 85 – 100N/mm20.2% proof stress (annealed)50 – 5520 – 30N/mm20.2% proof stress (half–hard)170 – 20060 – 65N/mm2Elastic modulu116 – 13070kN/mm2Specific heat385900J/kg KDensity8.912.70g/cm3Melting point1083660°CBecause of the high strength of copper, the insulators can be more widely spaced than is possible with lower-strength materials.
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