Leaded Solder Wire 60/40 Tin/Lead no-clean water-washable .020 1/2lb.PRODUCT HIGHLIGHTS- No-Clean Water-Washable Synthetic Flux Core- The clear, non-corrosive, non-conductive residue is meant to be left on the board. Residues that do remain are water soluble if you want to remove them. Clean with hot water at 60C (140F) minimum.- 2.2% flux core- Halogen content: None-Alloy: Sn60/Pb40