Senju Metal from 1995 for the first time in Japan, the first production of rosin core solder wire "SPARKLE SOLDER" since, have developed a variety of alloys or various purposes rosin core solder wire, lead-free solder for specific disadvantages, such as wettability ( diffusivity) and tin beads less spatter problems, make further improvements, significantly improve the above problems. SPARKLE ESC ~ wetting (spreading) good unleaded solder welding consumables and general comparison, welding wettability (diffusion) is the main drawback is poor, more general diffusion of tin-lead Lead reached only the general rate of about 90% or less of lead Wuxi. SPARKLE ESC (ECO SOLDER CORED), is developed for the lead-free rosin core solder wire, lead-free welding more general, a substantial increase in wettability (diffusion) and cut resistance, thus achieving a tin-lead with the general the same workability. ECO SOLDER RMA98 SUPER low flying, trust is good, there are requirements in recent years for its residue FLUX disposable trend, ECO SOLDER RMA98 under U.S. federal specification QQ-S-571's high reliability WU rosin core wire, not only in the welding FLUX residue after high reliability, low off sharply produce the phenomenon of flying tin beads, demonstrating excellent welding quality