Since the RoHs regulations came into force SAC solders with an Ag-percentage of between 3 and 4% have displaced SnPb solders as standard solders in electronic production.

The constantly increasing silver quotation caused a search for alternatives. The effects of a reduction in Ag-percentage within the electronic solders have been analysed by various research boards.

Solders with a silver amount at around 0.3 and 1% respectively are called "Second generation lead-free solders" by now.