Pending the Grand Wazoo's:
IPA is OK for un reflowed rosin/resin flux paste (just). Proprietary
solutions are better.
Water is only OK for water sol pastes. A little additive helps.
In either case the issues are
- Drying. Making sure stencils are dry before use or you will mix the
cleaner into the paste.
- Liquid impingement (spraying / US /etc). Ensuring the solder particles are
dislodged especially from the PCB. Its amazing how many nooks and crannies
there are to hide in on a PCB when you are only 25um big.
- Filtration. You don't wash the solder particles down the drain or fire
them onto the work.
Regards
Mike Fenner
Indium Corporation
T: + 44 1908 580 400
M: + 44 7810 526 317
F: + 44 1908 580 411
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Pb-free: www.Pb-Free.com
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Phil Nutting
Sent: Wednesday, September 01, 2004 4:18 PM
To: [log in to unmask]
Subject: Re: [TN] Cleaning populated boards with Isopropyl
I'm interested in what the "Grand Wazoo" Doug Pauls and Brian Ellis have to
say about this. If I've read their musings correctly alcohol does a nice
job of spreading the ionic schmootz where DI water cleans it very well.
If my research is correct, there are several automated DI water stencil
cleaning systems readily available on the market (www.aqueoustech.com
www.aat-corp.com to name just two) and these suppliers also make batch style
board cleaners. Austin American (aat-corp) has a new unit on the market for
under $10k.
Oops, was that too close to a sales pitch?
Why would you want to "eliminate DI water"?
Phil
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Black, Paul
Sent: Wednesday, September 01, 2004 10:58 AM
To: [log in to unmask]
Subject: [TN] Cleaning populated boards with Isopropyl
Hi Everyone,
I currently clean SMT stencils in a sink with hot deionized water. I would
like to automate this process (and eliminate the DI water) and have been
looking at cleaners that can do the job. One of them uses Isopropyl Alcohol
with no rinsing. This should work fine for the stencils but occasionally I
also have to clean misprinted boards that may already be populated on one
side, using no-clean solder paste. If I were to use this Isopropyl process
on the misprints, would I be risking reliability of the board?
Any help would be appreciated.
Thank you,
Paul Black
Manufacturing Engineer
Kronos
E-mail: [log in to unmask]
Voice: (978) 947-1520
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