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January 2007

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Subject:
Re: IPA cleaning
From:
"Davy, Gordon" <[log in to unmask]>
Reply To:
(Leadfree Electronics Assembly Forum)
Date:
Wed, 10 Jan 2007 10:11:55 -0500
Content-Type:
text/plain
Parts/Attachments:
text/plain (21 lines) 
Badri, I assume that you have concluded that it's not a good idea to use
IPA to clean after using a no-clean flux. Years ago, there were lots of
papers discussing "white residue." I published one showing that
soldering modifies the composition of rosin in such a way that when then
exposed to IPA it forms an insoluble residue.

If you have assemblies that have this residue on them, it is possible
(in a laboratory fume hood because of its flammability) to remove it
with either tetrahydrofuran or acetonitrile. 

Gordon Davy 


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