PRO 721 is a special halogen-free flux in accordance with ISO 9454/1 – 2.1.3 A for dip tinning of cable ends, strands, and enameled copper wires. The tinning process can be performed without pre-drying. It leaves virtually no visible residue. PRO 721 has excellent wetting properties. When used as intended, it provides completely uniform tin plating of the stranded wire section up to the insulation jacket. - Halogen-free - Excellent for dip soldering of copper wires - Excellent wetting properties - Contents: 1 L