Particle Size:10-25μm Model Number:rosin Origin:Mainland China Certification:CE scope of Application:welding main downstream platforms:other Individual weight: 11g Rosin is used as flux in welding. Theoretically, the melting point of the flux is lower than that of the solder, and its specific gravity, viscosity and surface tension are smaller than those of the solder. Therefore, during welding, the flux melts first, flows and covers the surface of the solder quickly, which can isolate the air and prevent the oxidation of the metal surface, and react with the surface oxide film of the solder and the metal to be welded under the high temperature of welding, so that it can melt and restore the pure metal surface. Proper soldering tin can help to weld a satisfactory shape of solder joints and maintain the surface luster of solder joints. Rosin is the most commonly used flux. It is neutral and will not corrode circuit components and soldering tips. If it is a newly printed circuit board, a layer of loose perfume should be coated on the surface of the copper foil before welding. If it is a prepared circuit board, it can be directly welded. In fact, the use of rosin depends on personal habits. Some people will dip the tip of the soldering iron on the rosin after each component is welded; I always soak some rosin in the electric soldering iron when it is oxidized and inconvenient to use. The use of rosin is also very simple. Open the rosin box and soak the electrified iron head on it. If solid solder is used for welding, it is necessary to add some rosin; If rosin tin wire is used (the core of the wire is wrapped with flux), rosin may not be used.