Alphametals offers the "Alpha K2685, aqua strip mask." Components:
Isopropyl alcohol, glicerin, acrylic polymer emulsion.
Among the various masks used, I have found this mask dries faster and
washes off pretty good.
> ----------
> From: Ryan Grant[SMTP:[log in to unmask]]
> Sent: Wednesday, October 06, 1999 6:04 AM
> To: [log in to unmask]
> Subject: Re: [TN] Temporary Solder Mask
>
> Bob,
> Sometimes you want to protect IC's from the wave, connector
> openings,
> and tooling holes as well.
>
> Ken,
> Are you using selective solder pallets? If not, that may be a
> solution.
> Another alternative that we use is polyimide tape. Of course
> this
> isn't water soluble.
> Also, there are silicon plugs that can be used for tooling
> holes.
>
> It sounds like a tough problem. In addition to what you are
> looking
> for, we are looking for a fast cure solder masking that is water
> soluble. (Continuous flow is difficult to do if you must wait ten
> minutes for the masking to cure.)
>
>
> Thanks
>
> Ryan Grant
> Process Development Engineer
> MCMS
> (208) 898-1145
> FAX (208) 898-2789
> [log in to unmask]
>
> >-----Original Message-----
> >From: Lustig, Steven K.. [SMTP:[log in to unmask]]
> >Sent: Wednesday, October 06, 1999 5:54 AM
> >To: [log in to unmask]
> >Subject: Re: [TN] Temporary Solder Mask
> >
> >Bob,
> >
> >I am neither Ken nor a Technet guru, but I'll give your question a
> shot
> >anyway.
> >
> >Temporary solder mask is applied by the board assembler (not the
> board
> >fabricator) to solderable areas (tin-lead coated areas, for example)
> of
> >boards going through the wave that you do not to solder at this
> particular
> >time. The solder mask is then removed after wave soldering to allow
> >subsequent operations on those areas. For example, we have a
> connector that
> >we hand solder in at a later stage (because it was easier due to
> other
> >process issues) so we apply temporary solder mask to those PTHs. We
> also
> >mask off SAT (select at test) resistor PTHs on that board, as well as
> a
> >strip where we bond a part subsequently.
> >
> >I hope this clears things up.
> >
> >-Steve
> >
> >Steven K. Lustig
> >Process Engineer
> >EMS Technologies, Inc.
> >Norcross, GA
> >(770) 263-9200 x4714
> >[log in to unmask]
> >
> >
> >-----Original Message-----
> >From: Bob Vanech [mailto:[log in to unmask]]
> >Sent: Wednesday, October 06, 1999 7:22 AM
> >To: [log in to unmask]
> >Subject: Re: [TN] Temporary Solder Mask
> >
> >
> > Ken or any other Technet guru..
> > I am not a total novice in this business, but I
> > don't understand where you would use a temp.
> > soldermask. In all the application that I have been
> > involved in, I worry about soldermask adhesion. Soooo,
> > would someone explain so that I might become a little
> > smarter before this old mind starts to head toward
> > senility ??? Oh, am I already there?? Hey, thanks
> > in advance. Have a great day.
> > Regards,
> > Bob Vanech Bob
> > BVAN Enterprise
> >> We have an application where we need to apply temporary solder mask
> prior
> >> to a high temp bake in preperation for wave solder. These are
> polyimid
> >> boards and we bake them at 125C for 12 hours prior to wave solder.
> We try
> >> to wave solder them as soon as they cool to ambient so applying
> mask after
> >> bake is out of the question.
> >>
> >> We have two different masks we currently use that are
> water-soluble.
> >> Neither one comes off very well in the water wash and one of them
> leaves a
> >> residue/stain due to the high temp bake.
> >>
> >> Do any of you have a source for a temporary solder mask that can
> hold up
> >to
> >> this temp/time and still be removed easily without residue
> (preferably
> >with
> >> water)?
> >>
> >>
> >> Thank you,
> >>
> >> Ken Bloomquist
> >> Sr. Principal Process Engineer
> >> PRIMEX Aerospace Company
> >> P.O. Box 97009
> >> Redmond, WA 98073-9709
> >> http://www.primextech.com
> >>
> >> Ph: 425-885-5000
> >> FAX: 425-882-5786
> >> [log in to unmask]
> >>
> >> Northcon/2000, Chairman of the Board
> >> http://www.northcon.org
> >>
> >> Electronics Manufacturers Association (EMA), Vice President
> >> http://www.ema-wa.org
> >>
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