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===5.1.8 Selection Criteria for Copper-Based Materials===
The selection of copper-based materials from the broad spectrum of available materials must be based on the requirements of the application. First anapplication profile should be established which can be used to define the material properties. Usually there is however no single material that can fulfill all requirements to the same degree. A compromise must be found as for example between electrical conductivity and spring properties.
If current carrying capability is the key requirement, mechanical strength may have to be sacrificed as for example in carrier parts for stationary contacts. In this case, depending on the current level, pure copper or low alloyed copper materials such as CuSn0.15, or for economic reasons CuZn30, may be suitable.
<figtable id="tab:Physical Properties of Nickel and Nickel Alloys">
<caption>'''Table 5.21: Physical Properties of Nickel and Nickel Alloys''' </caption>
{| class="twocolortable" style="text-align: left; font-size: 12px"
<figtable id="tab:Mechanical Properties of Nickel and Nickel Alloys">
<caption>'''Table 5.22: Mechanical Properties of Nickel and Nickel Alloys''' </caption>
{| class="twocolortable" style="text-align: left; font-size: 12px"
<figtable id="tab:Partial Selection from the Wide Range of Available Thermo-Bimetals">
<caption>'''Table 5.23: Partial Selection from the Wide Range of Available Thermo-Bimetals'''</caption>
{| class="twocolortable" style="text-align: left; font-size: 12px"
<figtable id="tab:Design Formulas for Thermostatic Bimetal Components">
<caption>'''Table 5.24: Design Formulas for Thermostatic Bimetal Components'''</caption>
{| class="twocolortable" style="font-size:1em;"
