Rosin Based Soldering Flux is activated for excellent soldering with good electrical insulation property of commercial type printed circuits boards. Rosin Based Soldering Flux can be used for both conventional through hole and S.M.D. soldering. Its flux residue is non-corrosive and non-conductive in presence of highly insulative rosin. The low solid content of 15 % Wt. The flux is washed off the board during soldering, so that there is practically no flux residue left on the board. This makes it unnecessary to clean the board by solvent or ultrasonic treatment and the boards dry and not sticky after soldering.