Electronic – How to identify lead-free solder if it’s unpackaged


Is there a test to determine whether solder is leaded or lead-free? Perhaps conductivity/resistance?

Best Answer

Lead-free solder has a much higher melting point than leaded. If you have a soldering iron and some leaded solder, set your iron to a temperature where it just melts the leaded stuff. Then, try heating up a component on the board at that temperature (make sure it isn't connected to a large copper pour).

If you're having trouble getting the solder to melt, there's a good chance that it's lead-free.