Before I get jumped on for being iresponsible, I did not mean to imply that the fluxmarker should be left on for long periods. As with chemical intended for temp. use it should be removed asap. This goes for tape, masking etc. Sorry if I gave the wrong impression. 
Charles Caswell

-----Original Message-----
From: Brian Ellis [mailto:[log in to unmask]]
Sent: Friday, February 28, 2003 9:58 AM
To: [log in to unmask]
Subject: Re: [TN] Fluxmarker


I'm sorry, I can't give you a valid answer because I don't know the
composition of the flux, but the best answer is as soon as possible.
Many w/s fluxes can start causing problems in less than 30 minutes and
the longer you leave it, the more difficult it will become to
effectively clean off the residues. However, if it's a logistical
problem of accumulating sufficient boards to cart over to the cleaning
machine, there is an elegant solution. Some flux manufacturers make a
chelating neutraliser or "Rinse Aid" (maybe under a variety of names.
This is a very mild alkali which neutralises the flux residues and
chelates the metal salts. NB This is NOT a saponifier and never use a
saponifier to do this. Make up a bucket-full at the lowest concentration
recommended and, as soon as you have finished doing whatever you do,
drop the circuit into the bucket. It's OK to keep it there for a couple
of hours or so. Then take the bucket over to the cleaning machine and
fish out the circuits to clean them. You will find your solder joints
will look a lot better and your assemblies will be cleaner at the end.

Brian

Larry Koens wrote:
> We use the water soluble fluxmarkers made by Sanford. I've been trying to find out how long this marker can remain on the PCB before washing is required.  Does anyone else use these markers? How long do you leave the markings on your assembly before washing?
>
> -Larry Koens-
>
>
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