... it is details such as delicate signals are carried in bundles of four-nines silver wire, while a solder of 99.99% pure copper and lead-free alloy ...
The commonly used solder type for electronics solder is lead-free rosin core solder. This type of solder is mainly made up of a Tin/Copper alloy. ... 7.3.2 Wire in Solder Materials Market, Revenue Forecast to 2030 (US$ Mn)