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The flux not only does its usual job of cleaning the soldering surfaces of impurities and oxidation, but it also provides a temporary adhesive that holds the surface mount components in place. Solder paste is a combination of a powder made up of metal solder particles and sticky flux that has the consistency of putty. Instead, a sticky solder paste is used to hold the parts in place and solder them as well. This new process is known as solder reflow, and it doesn’t use the standard pool of molten solder that the wave process uses. The lack of thru-hole pins in surface mount parts, however, forced the development of a new method of soldering in order to hold them in place on the board until the soldering was complete. Next came the development of surface mount parts which were smaller than their thru-hole counterparts due to their lack of long leads, and eventually they became the dominant component package type used on circuit boards. What is the Paste Used for Solder Paste Application?Įlectronic components were first hand soldered onto circuit boards until the wave soldering process was perfected for the mass production of PCBs. How this is used in different solder paste applications for the assembly of printed circuit boards is something that PCB designers should know about, and which we will take a closer look at here. Solder paste is actually an inventive combination of powdered solder and thick paste-like flux used in the solder reflow process. The paste used for soldering components onto printed circuit boards is a much more complicated recipe then just water and flour, but it is still a paste. You know what else paste is good for? Soldering circuit boards. For years it was the go-to solution for children’s art projects in grade school, and even today people will still use this simple paste to create amazing paper-mâché crafts like piñatas and masks. I once heard comedian Rita Rudner ask the question during a performance “How come when you mix water and flour together you get paste.and then you add eggs and sugar and you get cake? Where does the paste go?” My knowledge of the chemistry of cooking isn’t advanced enough to answer her question, but the basic form of paste is exactly as she described it and can still do quite a lot.