Immersion silver is a RoHS compliant finish available on any PCB configuration, at no additional cost.
Immersion silver is:
However, immersion silver is more susceptible to temperature and humidity as well as handling. If left exposed to the environment, immersion silver reacts with sulfur from the environment, creating silver sulfide on the surface of the board. Though Silver requires more care in storage and handling than immersion tin, immersion silver is nevertheless an emerging standard as a good, predictable, general purpose non-lead finish.
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