This water-based no-clean flux, Ecofree 303 of Promosol, contains no volatile halogen organic compounds (VOC) or amines. It is usable for wave soldering of components and modules in all mainstream assembly techniques, including pure and mixed SMT. It leaves no discernible residue on the board. The formulation comes as a clear fluid. The dry extract (3-hrs at 105°C) is left with 3.5%. The acid content (mg KOH/g) is 32. Ecofree 303 conforms to SIR (IPC TP 650). It can be applied as foam. Preheat temperature should be 110 to 130°C at the upper side of the board. This enables the elimination of all residues.
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