High-quality, halogen-free, lead-free solder wire for hand and automated soldering in electronics, electrical engineering, and electromechanics. The flux is characterized by high temperature resistance and does not spatter during melting. Optimal wetting and performance values that exceed standards make this halogen-free solder wire a top product among lead-free tubular solders. The new flux formulation "Ultra-Clear" is based on synthetic resins (free from rosin) and has been perfectly tailored to the needs of lead-free soldering technology in assembly manufacturing.