Tin Lead Rosin Core Solder Wire Reel Soldering 0.8mm 63/37 rosin core solder. FLUX 2.0% wire diameter: 0.8mm. Melting point: 361F/183C. Good solderability, insulation resistance, No spattering and Non-corrosive. Widely used in electrical and electronics, solder parts like circuit board, electronics devices and others. total wire lenght of one reel: 170cm .