We're using Vigon A-200 in a Technical Devices in-line
system, cleaning RMA flux residues.  The wash section has
two pumps, one for high pressure spray, and one for high
volume/flood.  We successfully clean a wide range of
assembly types at 1.5 feet per minute.

We're in the process of changing to a water-soluble flux
for wave solder, and a "cleanable" no-clean paste for SMT.
Some product will stay with RMA.

Vigon is expensive, but the major advantage is that you
may not need to dump the wash tank for a good long while
(months).  Of course, this reduces chemistry and disposal
costs.  We use deionized water for makeup, keep solution
concentration between 15 and 18%, and the tank at 122F.
We stupidly tried makeup with city water once, and developed
a foaming problem.

We don't have a filter loop - larger particles seem to stay
in the bottom of the tank.  We're thinking about adding a
filter loop to see if this would reduce clogging in the
spray nozzles.

-Joe


-----Original Message-----
From: Brian Ellis [mailto:[log in to unmask]]
Sent: Wednesday, February 18, 2004 2:36 AM
To: [log in to unmask]
Subject: Re: [TN] Cleaning Chemistry


Yes, I designed a batch cleaning machine specifically for Vigon. The
important thing is to keep the filter circuit pump running 24/24 or, at
least, several hours after use. The disagreeable part is changing the
filters because the saponifier solution is quite alkaline and the spent
filters are hazardous waste. I recommend you have 2 sets of filters and
a pair of 3-way valves, with a pressure gauge on the pipe between the
pump and the valve, so that you can see when a filter is becoming
clogged. I did toy with backwashing the filter but I don't think that
this would make much difference.

When discarding used Vigon solution, remember that it, too, is alkaline
hazardous waste, containing heavy metals and toxic hydrocarbons. If sent
to a specialist company for disposal, the containers must be
appropriately labelled.

The Vigon itself worked well with some fluxes and pastes, but not all.
As with all processes, qualification of the flux/paste, in conjunction
with Vigon, **under YOUR particular conditions of use**, is essential.

Brian

Dehoyos, Ramon wrote:
>         Hi Yo'all:
>                 One of our board vendors has changed their cleaning agent
to
> Vigon A 200 for their in line cleaning. Their in line cleaner is an
> Electrovert Aquastorm. Does anybody have any experience with this agent?
> Vigon A 200 is suppossed to be good for medium to high pressure.
>                 TIA.
>                 Ramon
>
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