We have a requirement to produce boards with immersion gold before
s.mask with hard gold fingers (edge connector). Doing immersion after
mask with hard gold fingers is our nornal process.We plate the fingers ,
apply mask , tape or peelable mask protect the fingers and immersion
gold the board. Doing the immersion befor the mask means there will be
an interface between the two golds. Is anyone doing this and if so what
are the pitfalls or advantages to the potential processes. This is a
tight design with little room between the top of the fingers and
adjacent open vias.
Paul Greene

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