1st of all, your process window may have to be checked.  The effective clean
is related to the WS flux of your choice and process control.  Some of
agressive one required good control of process window without exception.
This also imply to the tank and temperature as well as water quality system,
re-circulation, volume loading, space between assembly etc. etc.  You have
to test the qual parts that after running full load (min. 4 hr... I am Ms
piggy, I know) using ionograph.  Make sure the parts are not special make
for you (mean specially process window controlled only for pass Qual)..
Prefer test at "worst condition" process window... multi-pass reflow without
clean if it is allowed should be tested (if you use nitrogen oven that has
high oxygen content... watch out...).  SIR is nice, unless you control the
process, I am not sure  what the SIR god is going to say beside "It
depends...".
                     my 1.69 cents
                                     jk

-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Long, Thomas -
Avionics
Sent: Tuesday, November 22, 2005 9:01 AM
To: [log in to unmask]
Subject: [TN] Water Soluble Flux


        I am looking for some advice on qualifying a process for
switching from RMA flux to water soluble flux.  I am aware that a large
company learned through SIR testing (too late) that when switching from
RMA to water soluble their cleaning process was not effectively cleaning
all of the flux residues off and it was causing performance issues.  The
company actually had to scrap product and revisit type of flux and
cleaning.  I'm not sure if organic flux residues can be detected with
omegameter cleanliness testing and this product is class 3 high rel.

        I appreciate any input and experiences that anyone can share.

Tom Long
ITT Avionics

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