High-quality lead-free solder wire for hand 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 tubular solders. The new flux formulation, Clear, is based on synthetic resins (free from rosin) and has been perfectly adapted to the new requirements of lead-free soldering technology: high wetting speed and spreading on all commonly used surfaces in electronics, no 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 soldering tips that can be cleaned with conventional means, 100 MΩ test passed - also suitable for use in assembly production, significantly extending the lifespan of soldering iron tips.