Thanks, Yep it does have a very distinct odor and you don't want to spend hours sniffing glue. But it is fast and effective, and with small areas it is the ideal method. We clean with grain alcohol following. We use a fume hood to draw off the vapors and process via a charcoal filter.
Pat
From: [log in to unmask] [mailto:[log in to unmask]]
Sent: Wednesday, October 10, 2012 11:07 AM
To: TechNet E-Mail Forum; Goodyear, Patrick
Subject: Re: [TN] Conformal coating removal
Pat and Ioan,
I would be vewy vewy cautious with these. Yes, they work, but the if it is the one I am thinking of (purple pen body), the chemical is tetrahydrofuran. The smell of that chemical will knock a buzzard off a manure spreader at 50 paces. The greater concern is that if you have any residual THF, hitting it with a soldering iron releases some REALLY nasty chemicals. If you look back in the technet archives, Brian Ellis did a great dissertation of the bad effects of THF pyrolysis products.
On the other hand, you can take those same pens, pull out the fuzzy end, pour out the THF and refill with toluene to do what is needed. But I still found that once that tip gets a little use, it creates the same fibers Ioan gets from the Q-tips.
Doug Pauls
From: "Goodyear, Patrick" <[log in to unmask]<mailto:[log in to unmask]>>
To: <[log in to unmask]<mailto:[log in to unmask]>>
Date: 10/10/2012 12:24 PM
Subject: Re: [TN] Conformal coating removal
Sent by: TechNet <[log in to unmask]<mailto:[log in to unmask]>>
________________________________
Ioan,
We use Conformal Coating Removal Pens made by Trace Technologies and distributed by Tech-Spray. They are self-contained press tip pens that are about 4"x1/2" contain 12.5 ml fluid and have a wedge shaped felt tip, and we uses either Qtips or Foam tipped swabs to remove the duff. Their website is Techspray.com the part number is 2510-N, the material is also in bulk. You can maybe mix your own the chemicals are listed. We purchased some in bulk but the pens are easy, exact, and disposable.
Pat
Pat Goodyear
Control Technician
Pacific Gas and Electric
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Ioan Tempea
Sent: Wednesday, October 10, 2012 9:56 AM
To: [log in to unmask]<mailto:[log in to unmask]>
Subject: [TN] Conformal coating removal
Dear Technos,
We need to locally strip the acrylic coating (1B31S) from a few components, on a few thousands of boards. Right now we're using Q-tips to do the rubbing and, besides having to pluck tons of fibers afterwards, we're also going through a lot of Q-tips.
So the question is: is there anything else we can use, that will be more effective, cleaner and more economical?
Thank you,
Ioan Tempea
Ingénieur principal de fabrication / Senior Manufacturing Engineer [signature002]<http://www.digico.cc/>
950 RUE BERGAR, LAVAL, QC, H7L 5A1<http://g.co/maps/2gh3f>
T+ 1 (450) 967-7100, EXT244
------------------------------------------------------------------------
[signature001] <http://www.facebook.com/pages/Digico/277076778479>
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Lauréat Dunamis 2012<http://digico.cc/dunamis-2012/>
Entreprise manufacturière / Gestion du capital humain
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