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Organic Solderability Preservative is typically a thin organic coating that is non conductive but is subject to a shorter shelf life and mishandling can lead to oxidation.
Proper care must be taken when processing on the assembly line.  It too provides an alternative to silver as it is believed to have little effect on high speed signals since they are conducted through the copper. Does not work well with reworking as its capability to handle multiple heat cycles is limited.

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