Let Dewey perform a Comicographic test.
Inge
On 31 October 2011 14:34, Whittaker, Dewey (EHCOE) <
[log in to unmask]> wrote:
> I thought that would be over deweying it.
> Dewey
>
> -----Original Message-----
> From: [log in to unmask] [mailto:[log in to unmask]]
> Sent: Friday, October 28, 2011 11:04 AM
> To: TechNet E-Mail Forum; Whittaker, Dewey (EHCOE)
> Subject: RE: [TN] FW: [TN] Rookie question on RMA fluxes
>
> Forgot one....
>
> Dew or not to Dew
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Whittaker, Dewey
> (EHCOE)
> Sent: Friday, October 28, 2011 10:25 AM
> To: [log in to unmask]
> Subject: [TN] FW: [TN] Rookie question on RMA fluxes
>
>
>
>
>
> Speaking of an Apocalypse; I love the smell of RMA in the morning.
>
> All paste/flux compositions/combinations have their limitations (you
> thought I was going to say prose and cons). You need to identify them and
> the resultant compatibilities or the lack there-of. Some are as follows:
>
> * Clean or not to clean
>
> * Bake or not to bake
>
> * Coat or not to coat
>
> * Test or not to test
>
> * Time or not to time (mandate or need to have minimum time to
> clean after reflow)
>
> * Mask or not to mask (SMOBC or resist)
>
> * End-use environment or not
>
> * High Solids content or marginally so
>
> * IC or Church of Scientology
>
> * SIR or hey you
>
>
>
> I don't know if you can truly get a RMA anymore, but they certainly have
> washed up many careers.
>
> Stay thirsty my friends (for knowledge that is) and you can choose/create
> the process that best suits your product/customer requirements.
>
> Dewey
>
>
>
> -----Original Message-----
>
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Robert Kondner
>
> Sent: Friday, October 28, 2011 7:08 AM
>
> To: [log in to unmask]
>
> Subject: Re: [TN] Rookie question on RMA fluxes
>
>
>
> As my neurons warm up I recall:
>
>
>
> I loved RMA, great flux and non-corrosive. If it "Got Stuck" under
>
> components no big deal. Get OA trapped under parts with vias and it is all
>
> over in 5 years or less.
>
>
>
> My issue with cleaning was we wound up doing 2 cleaning cycles. The first
>
> was after wave or reflow. This got the board clean so it could be easily
>
> handled. After rework we cleaned again. We were building board level
>
> products so they had to "Look Good" which meant no spots of flux where THT
>
> or touch up had been performed by hand.
>
>
>
> We used OA for THT and rework which cleaned up in plain water fine.
>
>
>
> Bob K.
>
>
>
>
>
> -----Original Message-----
>
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Amol Kane
>
> Sent: Friday, October 28, 2011 9:53 AM
>
> To: [log in to unmask]
>
> Subject: Re: [TN] Rookie question on RMA fluxes
>
>
>
> Ioan,
>
> We use RMA flux on a regular basis. Would you be using it on SMT and/or
>
> wave?.....as phil mentioned, RMA flux needs to be cleaned in a saponified
>
> wash. Alcohol is a very bad de-fluxer in general and should not be used on
>
> RMA fluxes. In case of spot/hand cleaning, we use the Ensolv aerosol
>
> cleaner.
>
>
>
>
>
>
>
> Amol Kane | Process Engineer
>
> Catalyst Manufacturing Services, Inc.
>
> 941 Route 38, Owego NY 13827
>
> Phone: (607) 687-7669 Extn 349 | Website: www.catalystems.com
>
>
>
>
>
> -----Original Message-----
>
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Phil Nutting
>
> Sent: Friday, October 28, 2011 9:45 AM
>
> To: [log in to unmask]
>
> Subject: Re: [TN] Rookie question on RMA fluxes
>
>
>
> Ioan,
>
>
>
> "Flux for Dummies" version;
>
>
>
> RMA flux works just fine with the correct processing. If you are locked in
>
> to the RMA, then cleaning will best be done with a saponifier in a water
>
> wash system. Alcohol only does a good job of diluting the flux and
>
> spreading it over the entire board.
>
>
>
> Water soluble flux (OA) will work just fine, but again with the appropriate
>
> wash and dry.
>
>
>
> My engineers were leery of OA flux until I produced boards that were
> cleaner
>
> than we had ever gotten. Now it is all they will accept.
>
>
>
> I am sure there are some of our TechNet friend out there that can give a
>
> much more detailed response.
>
>
>
> Regards,
>
>
>
> Phil Nutting
>
>
>
> -----Original Message-----
>
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Ioan Tempea
>
> Sent: Friday, October 28, 2011 9:08 AM
>
> To: [log in to unmask]
>
> Subject: [TN] Rookie question on RMA fluxes
>
>
>
> Dear Technos,
>
>
>
>
>
>
>
> Although I've been around in this trade of ours for quite a while now, I
>
> have never had the occasion to work with RMA fluxes. I need to know how
> this
>
> functions. How can RMA be cleaned, I've heard about alcohol...? Is regular
>
> aqueous wash enough? If alcohol only, do we need a special equipment?
>
> Anything else to know?
>
>
>
> And, anyways, are RMA fluxes still available?
>
>
>
>
>
>
>
> Also, I imagine most of you at ease with RMA have tried to talk your
>
> customers into converting to water soluble flux chemistries. How hard was
>
> that? Is it possible?
>
>
>
>
>
>
>
> Thanks,
>
>
>
>
>
>
>
> Ioan Tempea, ing.
>
> Ingénieur Principal de Fabrication / Senior Manufacturing Engineer T |
>
> 450.967.7100 ext.244 E | [log in to unmask] <mailto:[log in to unmask]> W |
>
> www.digico.cc <http://www.digico.cc/>
>
>
>
>
>
> N'imprimer que si nécessaire - Print only if you must
>
>
>
>
>
>
>
>
>
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