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Thermally conductive adhesives provide many advantages over traditional mechanical fastening techniques.
When QFN and other bottom-terminated devices are soldered using solder paste at atmospheric pressure, some voiding is always observed. The process of void formation during reflow is dynamic; voids, primarily formed from volatilized flux materials and soldering reaction products, grow, coalesce and then vent at the margins of the solder joint while the solder is molten.
Electronics packaging has utilized one-part and two-part liquid adhesives and sealants for many years. Solid thermal interface pads or sheets have also been widely used in electronics applications.