National products manufactures a range of quality and high performance solders, fluxes and pcb chemicals used in electronics, instrumentation, automobiles, telecommunication, computer and other allied industries. National products offers fusing water soluble flux. This flux is used for re flowing of tin / lead coatings on printed circuit boards. It is primarily formulated for use in infra-red fusing ovens. Hot air ovens may also be used. The recommended fusing temperature for the standard 60 / 40 or 63 / 37 tin / lead coating is 220oc to 240oc.