I use Tech Spray 1631-16S to remove the HALO surrounding the BGA left behind when NC Flux has been processed.   This is for destructive analysis ONLY.
Perhaps the G3 series of tech Spray will work for you.

Victor,


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of David Tremmel
Sent: Monday, June 27, 2005 11:00 AM
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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