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January 1998

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Subject:
From:
Allan Kerr <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Fri, 23 Jan 1998 17:16:23 -0500
Content-Type:
text/plain
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text/plain (44 lines)
HASL does not leave a flat surface for the screen print operation, this is
especially true for very fine pinch boards.  Plus OSP is a "cleaner"
process, MANY of the fab shops are not properly equipped to clean
boards after the HASL operation.  If a fab shop can't clean a board to <3
mg. cl. sq. in.  they shouldn't sell boards that are to be used in a no-clean
process.  I'm sure CSL will add to this one.  This is a BIG issue to all of us
building high reliability products.

>>> Sheila Smith <[log in to unmask]> 01/23/98 03:27pm >>>
Hello,  Please refresh my memory ... what are the
advantages/disadvantages
of HASL over other processes?  Specifically, why would a Customer
direct a
PWB supplier that HASL is not to be used ...?

Sheila Smith

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