Kester 245No-Clean Solder Wire 63/37 .031" 1 lb. Spool Kester 245 No-clean Cored Wire was developed to complement low residue liquid fluxes being used by the electronics industry. The chemistry is based on some of the same principles that have been safely used for years in mildly activated rosin fluxes. The use of 245 No-clean Cored Wire results in visually acceptable assemblies without cleaning, yet soldering quality and efficiency is comparable to that obtained with mildly activated rosin flux.Features:Highly reliable post-soldering residue. Minimal residue67/37 Tin/Lead alloy.031" Diameter is most common for electronics work Kester number 24-6337-8800Compatible with leaded and lead-free alloys Excellent solder ability to a wide variety of metallizations Standard Core 50 (1.1% flux)Flux residue is non-corrosive and non-conductive Factory fresh, NOT SURPLUS.Shelf life 2 years from DOMA.