Ruben--It is important to understand that No-Clean means just that--NO CLEANING.  The
residue from a no-clean process that is properly implemented will be inert and NOT
cause any degradation when left on the PCB.  It is very common to see the white
residue as a result of trying to remove no-clean residue with alcohol.  If you WANT
to clean, you should be using a cleanable low-residue (non-rosin) flux.  Talk with
your flux supplier.  Jack

Jack Crawford, IPC Project Manger - Assembly
2215 Sanders Road, Northbrook IL  60062-6135
[log in to unmask]        http://www.ipc.org
847-509-9700 x 393
fax 847-509-9798

>>> Ruben Irizarry <[log in to unmask]> 02/12/98 11:40AM >>>
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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