That "special blend" solder is interesting; it appears from the MSDS to be a standard water-soluble flux core paired with an almost-standard SAC305 lead-free so

That "special blend" solder is interesting; it appears from the MSDS to be a standard water-soluble flux core paired with an almost-standard SAC305 lead-free solder (there's some Sb added). I'm not sure what's so nice about that, but I'll take their word for it. What I would NOT do, though, is choose this stuff for general purpose use, especially "tool bag" use. Water-soluble fluxes are powerful, but they must be cleaned or you'll have corrosion troubles. Maybe I'm just getting old, but I'd prefer a RMA-type flux here.