Solder Paste15 gram / 0.033 lb in a blue plastic screw top tub.Solder paste is a material used to connect surface mount components to the copper traces of a printed circuit board.A solder paste is essentially powder metal solder suspended in a thick medium called flux.Flux is added to act as a temporary adhesive, holding the components until the soldering process melts the solder.Nippon AmericaSP-15