Found this chart after a quick googling, the last one describes elec solder. I also found another link which may be better;
HERE
http://www.maycoindustries.com/solders.htmLead Free
Typical alloys consist of either tin, copper, bismuth and silver, or tin and antimony
Use on pipes carrying drinking water
Must be used with external flux
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Leaded Solid Wire
Typical alloy consists or tin and lead
Use for sheet metal repair, copper drain lines, etc.
Must be used with external flux
May be used for soldering or brazing
Not for use with potable water applications
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Acid Core Wire
Typical alloy consists of tin and lead or tin and antimony
General purpose solder for repairing galvanized gutters, filling metal seams, etc.
Does not require external flux application
Not for use with potable water applications
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Rosin Core Wire
Typical alloy consists of tin and lead or tin and antimony
Use for electrical applications, including wiring and other fine electronic work such as printed circuit boards
Does not require external flux application
Not for use with potable water applications
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