Kathy,

You have my empathy!  I don't know if you are a contract house or a captive
shop. Perhaps there are contarctural issues that you can bring to the
table.  I am assuming that you are building to Class 2 or 3. According to
IPC-A-600E, Dewetting on areas of solder connection exceeding 5% are
considered non0conforming. This is spelled out on Page 17.  In my opioin,
you and your QA/ME folks need to stay the course on this!

Perhaps, you may need to bring this to the attention of upper mangement. If
they are long term thinkers, they will back you. If they are short term
thinkers. they probably won't!

Good luck!

Charlie B.




Please respond to "TechNet E-Mail Forum." <[log in to unmask]>; Please respond
      to Kathy Palumbo <[log in to unmask]>



 To:      [log in to unmask]

 cc:      (bcc: Charles Barker/US/I-O INC)



 Subject: [TN] Dewetting Issues









Currently we are experiencing a lot dewetting issues on our HASL coated
boards.  When tested in house they failed IPC solderability testing, and
when tested at two outside independent labs they failed solderability
testing at both labs.  The problem we are having is our purchasing
department still thinks we are full of it and will not support us in
returning the boards to the board house, and naturally the board house is
taking our purchasing departments side and will not take the boards back
now.

Both our purchasing department and the board house are claiming "there is
no
long term reliablity issues with dewetting".  Naturally my M.E. and Q.E.
group disagree with their statement.

What I am looking for is long term reliability studies regarding dewetting
on typical HASL coated FR4 PCB material.  Does anyone out there know of any
such studies, or can you steer me in the right direction?

Thanks for you help in advance!

Sincerely,
Kathy Palumbo

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