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From:
Brian Ellis <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Mon, 18 Nov 2002 14:56:38 +0200
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Juan

The answers to your question are largely treated in the thread 'To wash
or not to wash (again)' started by George Carroll on 16.11.02.

I don't know anything about ROLO or ORLO (for me ROLO is a chocolate
covered toffee :-) ) so I can't make specific comments. However mixing
flux types is NEVER a good idea. It just adds to the composition of the
porridge I talk about in the above thread.

What shocks me, though, is that you talk about cleaning in Forane
(CFC-113). This has not been manufactured since 1995 and is a controlled
substance under the Montreal Protocol. If you have pure CFC-113 from a
stockpile, which is legal if against the spirit of the Protocol, you may
get away with it, although it is a terribly poor defluxing solvent. If
you have a blended CFC solvent, made for defluxing, it is well past its
sell-by and best-before dates. It will certainly not be what you think
it is and will quite likely cause far more harm than good to your
assemblies. If you purchased it after 01.01.96, you have probably
committed an illegal act. I'm not sure, but I believe the USE of
ozone-depleting solvents may also be banned in the EU. I would seriously
suggest you contact immediately the Spanish ozone office and ask for
advice as to how to dispose of it legally. And **please** do not
contribute any more to ozone depletion.

Oh! and all fluxes used for electronics soldering are organic :-)

Brian

Juan T. Marugán wrote:
> Hi technetters !
>
> Although I’ve read some messages about this matter, let me ask you some
> additional information.
>
> For our class 3 boards (avionics & military), we used rosin fluxes (ROL0).
> Now, we are thinking about to subcontract the assembly of some type of
> boards. One of the possible subcontractors uses no-clean organic flux
> (ORL0) for wave soldering. No post-solder cleaning is performed.
>
> After this assembly, we have to solder some components/wires to these
> boards so we will use our rosin flux. And, at the end, boards will
> conformal coated with Humiseal (acrylic).
>
> My questions are:
>
> 1.- Can the use of an organic flux (residues) to produce some effect in the
> solder joints performed later using rosin flux?
> 2.- What happen when these boards are cleaned with CFC solvents (Forane)?
> 3.- Have no-clean flux residues some effect in the quality (adherence, ...)
> of conformal coating?
>
> Thank you from Spain for your help.
>
>
> Juan T. Marugán López
> Production Quality Assurance
>
> INDRA EWS, Sociedad Anónima
> C/ Joaquín Rodrigo 11
> 28300 Aranjuez - Madrid (SPAIN)
> [log in to unmask]
> www.indra.es
>
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