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January 1998

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Date:
Mon, 26 Jan 1998 15:29:26 PST
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Hi there,
We are a medial device manufacturer and we're getting our finished PCB assemblies via a local vendor.
We are getting many rejects as we try to implement IPC-A-610. Our trouble is in 7.2.3 solder mask coating
breakdown.

MY QUESTION:

We are getting a small areas of exposed copper. Stuff you can't see with the naked eye. This is due to
either PCB fabrication or assembly process.  IS THERE AN ACCEPTABLE EXPOSED AREA THAT
CANNOT BE EXCEEDED OR SHOULD ANY EXPOSED COOPER NO MATTER HOW SMALL
IT IS BE REJECTED.

Thank you for your time and I look forward to getting an answer soon.

Arif Quronfleh
Sr. Project engineer
NeuroCare Group

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