Gold is most commonly used as a thin plating on connection points. The thin oxide layer that most metals form on their surfaces when exposed to air is not very conductive and can become pitted and uneven from the chemical reactions thus yielding a poor mating surface for a connector. Because it does not oxidize like most metals, gold can provide a reliable smooth surface that can make a good connection with the mated surface.
Gold is also good for extremely thin wires where losing even a small amount of cross-sectional area to oxidation can significantly lower the wires capacity.
MWS provides gold plated wire for the medical, electronic, aerospace and defense industries. We offer a complete range of gold plated wire including Type I, II and III purity deposits in both cobalt-hardened and soft gold purities.