Good morning David,
I don't know the answer to your question but I did post it on the trainer net.
Good luck and have a save and happy holiday.
Nancy T

>>> [log in to unmask] 05/25/00 04:56PM >>>
I was hoping to get some help from you IPC standards experts out there.

I was looking for the IPC standard that is violated when copper is exposed
on a gold finger card edge connector.  The copper that I am seeing is a
result of a chamfer that cuts an internal layer of the PCB.  The spec is for
.035 material removed along gold finger and .020 removed in the PCB's
thickness.  I expect analysis will prove that this spec is being violated.
I know that exposed copper is a violation but I cannot find a standard that
proves this in this scenario.

On a similar note, when ordinary gold fingers are made correctly and have a
chamfer, copper is exposed when the chamfer cuts into the gold finger
plating.  If this is a correct statement, why is this not a violation due to
corrosion of the exposed copper?

Thanks in advance

David Romero

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