Mainly used in electroplating and PCB board welding, plating solution for preventing infiltration of electronic parts to prevent droplets and steam bath and other pollution passive originals and welding shielding circuit surface terminal member; ensure that the electronic parts on the substrate when the package Resistance welding treatment step in solderability, solvent resistance and sealability. Even in welding, grinding, drying, plating such harsh conditions with the circuit board precision fit, can use no adhesive residue after peeling.