Just as with cutting solder preforms, there are many different ways to apply flux to solder preforms. At your facility you might use a liquid or tacky flux along with bare solder preforms. (Why flux is used is described here) At Indium, we can pre-apply flux to your solder preforms, and we can make the coating robust – since the coated preforms need to travel to you.
Flux that is pre-applied to solder preforms needs to be both benign enough to not react with the preform at ambient temperatures during long storage periods and aggressive enough to remove stubborn surface oxides when called to do so. I’m not sure what our chemists’ secret is, but they know how to make it work. The Indium Corporation currently offers 8 different fluxes coatings that can be applied to our solder preforms that are all designed in this way, all designed for different specific soldering applications.
To learn more about flux coated preforms, click here.
*This post is part of the World of Solder Preforms series