Hello Marc,

Saponified wash is a wash system using a "saponifier" or detergent in the
wash section of the aqueous cleaner. Typically the wash section is charged
with a certain percentage of detergent to help in the cleaning operation.
The following sections of the cleaner are to rinse off the residues from the
wash tank and subsequently dry the product.

The saponification system was design to wash off rosin fluxes from the
surface of the printed boards. The detergent was a saponifier as it
converted the rosin flux into a rosin soap which was then water soluble and
could be removed from the surfaces of the products. When water soluble
fluxes came into vogue, the aqueous cleaners were converted to cascading
rinses with consecutively cleaner water with a final rinse of DI water, the
dried.

Whether or not a saponified aqueous cleaner will remove the residues from a
Low solid content flux "NO Clean", is dependent upon the chemistry of the
flux and its chempatibility with the saponifier used in the cleaner. I
remember an old saying we used to use, you need to know what it is you are
removing before you can select the material to remove it with. This
definitely applies here and that information should or must be made
available to you through you flux manufacturer.

Hope this helps.

Good Luck

Leo Lambert
EPTAC Corp
WWW.EPTAC.COM
[log in to unmask]

-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Marc Cowen
Sent: Monday, December 17, 2001 7:22 AM
To: [log in to unmask]
Subject: [TN] Saponified Wash


Hi All,

I am after some advice regarding saponified wash being used with a no-clean
process.
What is a saponified wash?
With regards to not using a wash with a no-clean process is it also common
practice to use this type of process flow (solder using no-clean flux then
through a saponified wash).

Thanks for your help.

Best regards

Marc Cowen.

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