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 performance values that exceed standards make this lead-free solder wire a top product among tube solders. The new flux formulation, Clear, is based on synthetic resins (free of rosin) and has been perfectly tailored to the new requirements of lead-free soldering technology: high wetting speed and spread on all common surfaces in electronics, no (painful) flux splatter 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, which can be cleaned with conventional means (FELDER Tinner, solder sponge, steel wool), passed the 100 MΩ test - also suitable for use in assembly production, significantly extends the lifespan of soldering tips.