Paul: You do not state what type of cleaning equipment you have, if any.

I think will find most available bench top cleaning chemistries do a poor
job of completely solvating and removing no-clean residues. Even those
supposedly designed for no-clean require mechanical action in conjunction
with the chemical action for complete removal.

If you must remove the no-clean flux residue let me offer you two
possibilities. They are both available thru Petroferm although I'm sure
others have similar products.

The following is how we use these chemistries.
One is BIOACT EC-Ultra which is an aliphatic ester. It is used hot(140F)as a
semi-aqueous cleaner followed by a hot(150F)water rinse and dry. This is
done in a conveyorized inline spray cleaner.

The second product is BIOACT SC-10, it is a blend of aliphatic hydrocarbons,
alcohol and terpene. It is used at room temp with the PCB submerged in a
circulating bath, this is followed by an isopropyl alcohol rinse and dry.

Unless you have the proper equipment, my advice would be if you don't
absolutely have to remove the flux residue, don't. You will probably just
make a bigger mess both cosmetically and functionally then if you had left
it alone. Good Luck.


Regards

Michael Barmuta

Staff Engineer

Fluke Corp.

Everett WA

425-446-6076


remove the no-clean flux residue
-----Original Message-----
From: Paul Gill [mailto:[log in to unmask]]
Sent: Friday, April 13, 2001 9:34 AM
To: [log in to unmask]
Subject: [TN] No-Clean Residue


Hi All,

I am searching for information about solvents to remove no-clean residue.

The appearance is that of a white residue.  I don't know the composition of
the residue.

Any help would be appreciated.

Thanks

Paul Gill
Senior Process Development Engineer
Finisar Corporation
(408) 541 5626

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