63-0000-0958 is a no-clean, 958 soldering flux that comes in 1 Gallon packaging. Kester 958 is a no-clean, non-corrosive liquid flux that is specifically designed for the wave soldering of conventional and surface mount circuit board assemblies. 958 was developed to give excellent soldering performance on bare copper printed circuit boards treated with OSP coatings. Essentially, no residue remains after soldering. Boards are dry and cosmetically clean as they exit the wave solder machine, thus posing no interference with electrical testing. A major advantage of this flux is the reduced odor associated with the soldering process.