Based on my interpretation of J-STD-001C Appendix B, only SIR and Visual
Inspection are required.  The others are optional.  Of
course....J-STD-001 has uprev'ed and is now at rev D and was released
this week at APEX.  Not sure if the new rev says something different.  I
should be getting my new copy by Friday!  

In addition, your customer can always over-ride what the J-STD says.  We
are using an OA flux which does not meet the specification, but, our
customer asked us only to perform one of the "optional" tests as they
felt that would meet their needs.

-Carrie 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Chris Schaefer
Sent: Wednesday, February 23, 2005 2:28 PM
To: [log in to unmask]
Subject: [TN] Wave Solder Flux Conversion Qualification

Hello everyone!~~~~

I have a few questions concerning the "Qualification" of a new flux type
for a wave soldering process. To start out with let me state that I am
dealing with products that are Class 3 with exceptions to the standard
(IPC-
610-C) with poor designs, which will not change any time soon. We are
currently using a 2% NC flux applied by spray and are changing to an RMA
18% applied via foam. The testing has shown a highly significant
reduction in the # of defects, but our customer requires certain things
prior to acceptance. So the questions are which of the following tests
are truly needed and which tests are not (and thes ones that are not
needed, why?):

* SIR Testing (per IPC-TM-650) using B-36 test platform * ECM
(Electrochemical Migration) Testing * Ion Chromatography testing each of
the supplied boards * Surface Organic Contamination * Conformal coating
adhesion * Component compatibility * Residue analysis as required

Now we believe that SIR and IC testing are the only ones that are truley
needed in this arena and from a practical standpoint the only necessary
ones. Now we clean these boards with a material that has proven it self
over time with a excellent inline cleaner, and have 100% confidence that
the test results from the SIR and IC will come back with stars on them.

I could really use some help here... I'm not an expert in this realm of
Engineering and would appreciate some input as ammo that could be used
to sway them to our way of thinking.

Thank You.

CAS

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