Surface mount adhesives (SMA) are used in wave soldering and reflow soldering to keep components in place on printed circuit boards (PCBs) and ensure that components do not get lost during transfer on the assembly line. Most surface mount adhesives (SMA) used in PCB assembly are epoxies, although acrylics are also used for special purposes. After the introduction of high-speed dispensing systems and the electronics industry mastered how to deal with products with relatively short shelf lives, epoxies have become a more mainstream adhesive technology worldwide. Epoxies generally provide good adhesion to a wide range of circuit boards and have very good electrical properties.
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