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→6.4.5 Physical Effects in Sliding and Connector Contacts
{| class="twocolortable" style="text-align: left; font-size: 12px"
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|dV/dx = k x F<sub>K</sub> /3 H<sub>W</sub> |-
|dV/dx Wear volume in mm<sup>3</sup> per slide path length in mm
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|k Coefficient of frictional wear
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|H<sub>W</sub> Hardness of the softer material <br />(Brinell or Vickers units)
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|F<sub>K</sub> Contact force in cN
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|'''Wear coefficient k during material transfer'''
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|Silver – Silver 120 x 10<sup>-4</sup>
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|Platinum – Platinum 400 x 10<sup>-4</sup>
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|Silver – Platinum 1.3 x 10<sup>-4</sup>
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|'''Coefficient of fractional wear k during wear loss'''
|-
|Silver – silver 8 x 10<sup>-4</sup>
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|Gold – gold 9 x 10<sup>-4</sup>
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|Platinum – platinum 40 x 10<sup>-4</sup>
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|Silver – gold 9 x 10<sup>-4</sup>
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|Silver – platinum 5 x 10<sup>-4</sup>
|}
