David,

I have used "Vigon US" for no-clean flux removal.  It does a superb job, but maybe there is something better suited to your application.

I make no commission  :-) They have been very helpful in the past

Steve Creswick - Gentex Corp



Here is the contact info:

Umut Tosun, M.S.Chem.Eng.

Application Technology Manager 
Zestron America 
21641 Beaumeade Circle 
Suite 315 
Ashburn, VA 20147 

Phone    (703) 589 1198 ext-102

Cell     (703) 608 9029 
Toll Free. (888) 999 9116 ext-102
Fax        (703) 821 9248 
E-mail     [log in to unmask]




-----Original Message-----
From: David Tremmel [mailto:[log in to unmask]]
Sent: Monday, June 27, 2005 12:00 PM
To: [log in to unmask]
Subject: [TN] Flux residues


Technetters,

I have received some microBGAs which I have to reball and they have a
no-clean flux residue which is difficult to remove.  Also, when it comes in
contact with our water-soluble flux it creates an acid which is not very
'friendly' to the part.

Would any of the chemical gurus care to edify one of the uneducated ones why
no-clean flux, when dried and allowed to set for a couple of months is so
difficult to completely remove and what possible acids or chemicals are
created when it is combined with water-soluble flux (type ORM1)?

As always, I appreciate the responses I receive.

David Tremmel
Technical Manager
BT Mexico

_________________________________________________________________
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