Resin and acid core solders are manufactured with the solder wire as a tube and the center of the tube contains the flux. Resin core solder contains a mild flux and is designed to solder parts where flux residue cannot be removed. An example would be electric circuit boards, or electrical connections. In these applications there is often no practical way to clean flux residue after soldering. Resin flux residue is non-corrosive which eliminates the need for post solder cleaning. The mild nature of resin core limits its use to copper and brass.
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