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December 2004

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Subject:
From:
Lee Parker <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Lee Parker <[log in to unmask]>
Date:
Thu, 9 Dec 2004 14:35:37 -0500
Content-Type:
text/plain
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text/plain (70 lines)
Connie

The industry has been using OSP boards for years. After a few thermal
cycles the coating is usually removed. Since the reflowed solder usually
does not wet the complete land, there is in point of fact exposed copper
on the board. There must be millions of such cases in the field and I
have not heard of any associated catastrophic problem. Other good
examples of exposed copper in everyday occurrences are water pipes and
light switches. Although copper forms an oxide it is limited to the
surface. It does not behave as a ferrous material.

Best regards

Lee

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Connie Korth
Sent: Thursday, December 09, 2004 9:59 AM
To: [log in to unmask]
Subject: [TN] copper exposed

        Good AM Techies,

        We have some resistors that did not take the tinning all the way
to the
body.  There is some copper exposed by the body, but the lead in the
solder
connection is good.  Per IPC-610, if copper is exposed due to
deformation
or nicks/gouges >10%, it is a defect.  We have absolutely no deformation
in
these component leads.  My decision was to leave them in the board.  We
have a Mfg. Engineer who wants to have them all replaced.  He feels I
have
interpreted the IPC-610 incorrectly.  I feel that this is unnecessary
rework that could damage the PCB.  Any supporters out there?

        Connie M. Korth
        Quality Specialist
        Reptron Manufacturing Services, Hibbing
        [log in to unmask]
        218.262.8209

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