Ruben,
The white residue problem is one that is common with some no-clean
fluxes and not others.  One choice would be to change your flux.  For
instance, Kester 924FB ( a good flux) gives a lot of this but 923 and
951 do not.  Similar things could be said for fluxes from other
suppliers, I am just using Kester as an example.

In our plant we do still use some Kester 924FB and we use Axarel 2200
for cleaning.  This is a mixture invented by DuPont scientists.  The
rights to it have been sold to Petroferm in Florida (904-261-8286). At
the crudest description level Axarel is essentially a mixture of an
alcohol and paint thinner.  More specifically, the two reportable
ingredients are an ether-alcohol (1-propoxy-2-propanol) and mixed
aliphatic hydrocarbons.

Another option would be to change over to VOC free fluxes, which by
their very nature should be cleanable with water, unless you have REALLY
fried the residues.

Good luck.

Bev Christian
Nortel
>----------
>From:  Ruben Irizarry[SMTP:[log in to unmask]]
>Sent:  Thursday, February 12, 1998 12:40 PM
>To:    [log in to unmask]
>Subject:       [TN] What can I use to clean my boards after rework if I am in NO
>-CLEAN Tech.??????
>
>Hi everybody I am having a problem, and it is that we used to use Water
>soluble paste in the past and for that we used Alcohol to clean reworked
>boards. Now we are in No-Clean and if we use alcohol there are some white
>residues that sometimes bothers me a lot. Could somebody tell me more about
>this white residues, how can I clean them, what can I use, are they
>acceptable. This is urgent to me I will appreciate all your help.
>
>Gracias,
>Rub?n E. Irizarry-Guzm?n
>Operations Engineer
>
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