Washing water is the common name of circuit board cleaning agent. It refers to the chemical industrial cleaning agent solution used to clean the residual flux, rosin, solder slag, ink, handprints, etc. on the surface of PCB circuit boards after soldering. The traditional method of cleaning printed circuit boards is to use organic solvents. The mixed organic solvent composed of CFC-113 and a small amount of ethanol (or isopropanol) has a good cleaning ability on the residue of rosin flux, but because of CFC- 113 has a destructive effect on the atmospheric ozone layer and was banned in 2013. The non-ODS cleaning processes that can be used include water-based cleaning, semi-aqueous cleaning, and solvent cleaning. In addition, no-clean processes without cleaning can be used.
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