I agree, but assuming the no-clean flux used for rework was selected for
compatibility with the fluxs used in other process steps, introducing an RMA
material would also require extensive testing.

Brad Vanderhoof
AITI


----- Original Message -----
From: "d. terstegge" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Friday, April 11, 2003 1:06 AM
Subject: Re: [TN] Too Much No Clean


> Hi,
>
> I assume that by using so much flux for handsoldering, there will be
> visible residues afterwards. If this is the case, then what's the point
> of using no-clean flux ?   Using a good old RMA flux may be a better
> choice, with better wetting properties and less corrosion risks as the
> acitivators  (if there's something left after soldering) are safely
> embedded within an insulating colophony layer.
>
> Another suggestion is to look in the datasheets of the flux you're
> using, and check if the unheated material is qualified to be left on the
> board. The datasheet should be backed up by a detailed testreport.  But
> be aware that there's still a risk that the results on your boards are
> worse than on the testsamples that were used by the flux manufacturer.
>
> Daan Terstegge
> Thales Communications
> Unclassified mail
> Personal Website: http://www.smtinfo.net
>
>
> >>> [log in to unmask] 04/10/03 11:07pm >>>
> Hello Technetters!
> I often observe rework/touchup operators drenching the area of a PCB
> they are soldering with no clean flux. When the flux spreads to an area
> not heated by the soldering iron or washed away, what long term effect
> will this have? Will it affect only certain designs or would this be a
> problem for most?
> TIA for your help!
>
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