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March 1998

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Subject:
From:
Aric Parr <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Tue, 10 Mar 1998 08:51:14 EST
Content-Type:
text/plain
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text/plain (66 lines)
Make sure the spray pressure is low enough to eliminate the risk of
abrading the coating (difficult to imagine with 2577). Do not put any of
these panels through an Omega meter or equivalent. Unreacted monomer and
fragments may trash the resin beds. I know acrylic trashes the bed and
comes off in the cleaner.

Saponifiers may delaminate and/or swell some coatings.

Softer coatings can abrade and redeposit on product in the cleaner, leaving
cosmetic problems or clogging filters.

Just some experience I had at a prior location.
-------------
Original Text
From: C=US/A=INTERNET/DDA=ID/TechNet(a)IPC.ORG, on 3/10/98 8:47 AM:
To the "Net":

I have boards which require some rework. The boards have been conformally
coated with Dow-Corning 1-2577. Coating has been thoroughly removed from
the
affected area. The part has been removed. I have a selective soldering
pallet that will expose only the leads for this one part when I re-run the
board over the wave solder machine using water soluble flux. None of the
other soldered leads are reflowed during this operation. This part of the
process is working well.

The question that I have is, I wonder if there is any harm done to  the
conformal coating when running it through my in-line water cleaning system.
Inspection under blacklight reveals that the coating is intact. I cannot
see
any visible damage. Does anyone have any experience with water cleaning
circuit boards with conformal coating on a portion of the board ?

Thanks,

Bill Kasprzak
Moog Inc.
716-652-2000 ext 2507
[log in to unmask]

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