This bismuth-tin solder has similar performance properties to lead solder, but is also safe for use in food-processing equipment and copper water pipes. It has a lower melting point than most solders, so it’s good for sensitive assemblies, such as semiconductors and electronic components, as well as for step soldering with traditional solders. However, it’s less thermally conductive than other metals and more brittle than lead. Flux isn’t required, but for easier cleanup use it with no-clean soldering flux. This solder is lead-free, so it is safer to use than leaded solder and helps meet industry regulations. Do not use this solder on drinking water pipes.

Solder with 1% silver forms stronger bonds than solder without silver. It’s also more malleable and ductile. However, it has a higher melting point, so it takes longer to solder.