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→5.1 Copper and Copper Alloys
The purity of technically pure and un-alloyed copper used for electrical applications depends on the type used and ranges between > 99.90 and 99.95
wt%. The copper types are designated mainly by their oxygen content as oxygen containing, oxygen-free, and de-oxidized with phosphorus as
described in DIN EN 1652 ''(<xr id="tab:MaterialDesignations"/> and <xr id="tab:tab5.2Composition of Some Pure Copper Types"/> 5.2)''. <xr id="tab:tab5.3Physical Properties of Some Copper Types"/> Tables 5.3. and <xr id="tab:tab5.4Mechanical Properties of Some Copper Types"/> 5.4 show the physical and mechanical properties of these copper materials. According to these, Cu-ETP, Cu-OFE, and Cu-HCP are the types of copper for which minimum values for the electrical conductivity are guaranteed.
Cu-ETP is less suitable for welding or for brazing in reducing atmosphere because of the oxygen content (danger of hydrogen embrittlement).
<figtable id="tab:tab5.2Composition of Some Pure Copper Types">
'''Table 5.2: Composition of Some Pure Copper Types'''
<figtable id="tab:tab5.3Physical Properties of Some Copper Types">
'''Table 5.3: Physical Properties of Some Copper Types'''
<figtable id="tab:tab5.4Mechanical Properties of Some Copper Types">
'''Table 5.4: Mechanical Properties of Some Copper Types'''
<table class="twocolortable" border="1" cellspacing="0" style="border-collapse:collapse">
</figure>
From the large number of high-Cu alloys only the properties of selected ones are covered here <xr id="tab:tab5.5Physical Properties of Selected High Cu Content Copper Alloys"/> (Tab. 5.5) and <xr id="tab:tab5.6Mechanical Properties of Selected High Cu Content Copper Alloys"/> (Tab. 5.6). Some of these materials are not included in the EN standards system.
The low alloyed materials CuAg0.1 and CuCd1 are mostly used as overhead drive cables where they have to meet sustained loads at elevated temperatures without softening.
<figtable id="tab:tab5.5Physical Properties of Selected High Cu Content Copper Alloys">
'''Tab. 5.5 Physical Properties of Selected High Cu Content Copper Alloys'''
<figtable id="tab:tab5.6Mechanical Properties of Selected High Cu Content Copper Alloys">
'''Table 5.6; Mechanical Properties of Selected High Cu Content Copper Alloys'''
