High-quality lead-free solder wire for manual and automated soldering in electrical engineering, electromechanics, and electronics. The flux is characterized by high temperature resistance and does not spatter during melting. Optimal wetting and superior spreading values make this lead-free solder wire a top product among tube solders. The new flux formulation, Clear, is based on synthetic resins (free from rosin) and has been perfectly tailored to meet the new demands of lead-free soldering technology: high wetting speed and spreading on all surfaces commonly used in electronics, no (painful) flux spattering on the assembly, equipment parts, or the hands of users, crystal-clear flux residues to enhance the optical impression, minimal outgassing and neutral odor reduce workplace exposure, easily removable residues on solder tips, which can be removed with conventional means, passed the 100 MΩ test - also suitable for use in assembly production, significantly extends the lifespan of soldering iron tips.