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May 2001

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Subject:
From:
"Hollandsworth, Ron" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Tue, 1 May 2001 11:13:36 -0500
Content-Type:
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Dan:
A couple years ago I had the same problem with a white residue.  Couple
things you can do.

First, the particular product we were working with had to be clean, per the
customer, and the nature of the product.  In the past if the De-ionized
water is not at the specified level, in other words been in there for a
while, then that could cause it.  Something to check.

Second,  check your rinse stages to make sure you are not getting any
foaming action.  The foam could cause spots or white residue.

Third, call or e:mail ( [log in to unmask] <mailto:[log in to unmask]>  )
Terry Munson at Contamination Studies Labs.  I recommend e:mail, it's faster
yet then call.  In our case we had Terry come up to the plant, review our
cleaning operation and we setup some tests/experiments on some boards.  What
we wanted to do is show the customer that what they were looking at was not
a loose residue (white residue) and second that it was not harmful.  We
invested in CSL's ability to prove this.  CSL provided us a very quick turn
on the testing and information.  Bottom line was we feel real good about our
process and now we had the proof the process was ok.  Even more important,
our customer was happy that we had empirical evidence that their product was
good.  The reasons for step one and two is that Terry will ask you that when
you call him.

Hope this helps.

Ron Hollandsworth
ITT

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