Solder material for forming solder coated circuit board and circuit board

摘要

There is provided a solder work material for forming solder-coated circuit boards, which is capable of preventing the malfunctions of these circuits that may be generated by voltage noises due to the volumetrical expansion of the flux residue in a soldered laminated ceramic capacitor, etc. even under the environments where temperatures fluctuate widely (for example, -40 DEG C to +85 DEG C), or that may be generated by voltage noises due to the fluctuation of parasitic capacity between circuits due to the presence of a flux residue. There is also provided a circuit board having a residual film of flux left thereon after the deposition of the solder work material. This solder work material is formed of a solder paste composition or a resin flux-cored solder, both comprising a flux containing, as a resin component, resin - based resin and acrylic resin for preventing the generation of voltage noises in electronic devices.