Standard 60/40 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. The high-activity, fully-activated flux creates more reliable soldering and leaves bright shiny solder joints after reflow. Rosin activated flux 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 at a temperature of around 100°F. This flux cored solder wire meets QQS-571E specification and applicable IPC-J-STD-004 and IPC-J-STD-006 requirements.