Silver Impregnated Graphite (SIG) contacts are used in high safety applications of railway signaling, traffic signaling, and numerous other applications that eliminates the risk of welding in the presence of graphite. SIG relay contacts combine the best properties of silver and graphite into a composite material. Distinctive features of the SIG material include its hard fusing characteristic, better conduction of heat and electricity, and easy brazing.This combination of properties makes these contacts suitable for high safety applications such as railway signaling, traffic signaling, and numerous other applications.