ABS resin ---- is a mixed resin composed of Acrylonitrile-Butadine-Styrane (acrylonitrile-butadiene-styrene), in which the rubber part of butadiene can be corroded by chromic acid and pores appear It can be used as the landing point for chemical copper or chemical nickel, so that electroplating can be continued. Many assembled parts on the circuit board are purchased ABS plating.