Discover the Almit solders specially developed for copper soldering, which effectively reduce leaching.
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Tin-copper phase diagram
The diagram shows how quickly copper moves into the tin melt as a function of temperature. It is important to use the right alloy to minimise copper leaching.
Information on leaching can also be found in the terminology of soldering:
https://www.almit.de/terminologie-des-Lotens/leaching