Anisotropic conductive adhesives (ACAs) are a group of electrically conductive adhesives that exclusively conduct across the bond-line.
Although silver is expensive it's still the most common conductive epoxy filler. Particles are highly conductive and available in useful shapes and sizes.
Solder outperforms epoxy in regards to electrical resistance, and therefore epoxy is generally only chosen due to specific assembly constraints.
Epoxy resins can be filled with electrically conductive metals to achieve low electrically resistivity and compete with solder in many applications.
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An Electrically conductive epoxy is electrically insulating. Here are examples of materials used to lower the electrical conductive epoxy.