Electrical Soldering Wire is great for soldering electrical components, wiring and metals like copper and tin. The high activity flux creates more reliable soldering and leaves bright shiny solder joints after reflow. High-purity formula for electronics work, soldering electrical components, and other general-purpose applications. Easy to use and suitable for home repairs and various soldering projects. It will leave slight to moderate post-process residues. These residues may be left on noncritical applications, but should be cleaned and removed from any critical or military-grade applications. It is recommended to perform any post-process cleaning within a two to three hour period.