The two most commonly used types of lead-free solder are SnAgCu (tin-silver-copper, also called SAC) and SnCu (tin-copper). SnAgCu alloy with 3% silver and 0.5% copper (SAC305) was initially ...

so it's quicker to use and less challenging to work than lead free solder. However, it's toxic and bad for the environment.

For most of the history of industrial electronics, solder has been pretty boring. Mix some lead with a little tin, figure out how to wrap it around a thread of rosin, and that’s pretty much it.

Q: I’m setting up a model railroad on a 6 x 12-foot table. The layout will use Digital Command Control. What would be the ...