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Sn40Pb60 is used an Organic Flux core which makes solder wire as a water soluble formula for use in flux-cored solder wire. This cored solder version of the popular organic water soluble rosin flux is more effective than rosin fluxes in soldering difficult metals. The same fast action and mild properties are exhibited with 331 Organic Flux as with the tacky ZX. The flux core wire is more heat stable than others, resulting in minimal smoke and odor. The residue can be completely removed with a simple water rinse