Kester 245 is a compatible with both leaded and lead free alloys, provides a minimal and very reliable post-soldering residue - Kester 245 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 results in visually acceptable assemblies without cleaning, yet soldering quality and efficiency is comparable to that obtained with mildly activated rosin flux. 245 is classified as ROL0 per J-STD-004. 245 is Bellcore GR-78 compliant.