Doug,
I totally agree. The need to establish compatibility of your assembly and the cleaning/stripping process is paramount; however with knowing the midget physic who escaped from Florence State Prison (small medium at large) and the right masking approaches, I would still rather strip/clean, test and re-coat.
Dewey
________________________________
From: [log in to unmask] [mailto:[log in to unmask]]
Sent: Wednesday, October 10, 2012 11:03 AM
To: TechNet E-Mail Forum; Whittaker, Dewey (EHCOE)
Subject: Re: [TN] Conformal coating removal
Dewey,
Will I don't disagree, stripping of an entire assembly, especially if you have thousands, is incredibly wasteful and often causes as many problems as it solves. Global stripping involves immersion in toluene or xylene and creates a LOT of flammable waste and often gets into other connectors and keep out zones where it causes problems. The media blasting is a dry process and the residues easily removed. I would suggest a light toluene swab of the area anyway to make sure that you don't have any residual coating on the pads that would interfere with a good solder joint.
Doug Pauls
From: "Whittaker, Dewey (EHCOE)" <[log in to unmask]>
To: <[log in to unmask]>
Date: 10/10/2012 12:17 PM
Subject: Re: [TN] Conformal coating removal
Sent by: TechNet <[log in to unmask]>
________________________________
I would wait for Doug on this, since he takes his lead from Graham on sartorial splendor and is more used to partially coated affairs. I would strip the whole assembly if possible as the process does an excellent job of prepping the substrate for re-coating.
Dewey
-----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]
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>
------------------------------------------------------------------------
Lauréat Dunamis 2012<http://digico.cc/dunamis-2012/>
Entreprise manufacturière / Gestion du capital humain
______________________________________________________________________
This email has been scanned by the Symantec Email Security.cloud service.
For more information please contact helpdesk at x2960 or [log in to unmask]
______________________________________________________________________
______________________________________________________________________
This email has been scanned by the Symantec Email Security.cloud service.
For more information please contact helpdesk at x2960 or [log in to unmask]
______________________________________________________________________
______________________________________________________________________
This email has been scanned by the Symantec Email Security.cloud service.
For more information please contact helpdesk at x2960 or [log in to unmask]
______________________________________________________________________
|
