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August 2000

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Subject:
From:
Hinners Hans Civ WRALC/LYPME <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Tue, 29 Aug 2000 16:00:49 +0100
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Hi Peter,

First, we don't coat paneled boards but individual assemblies.

If you are talking acrylic conformal coating (Humiseal 1B31 or 1B73 for
example) I've noticed it can lose adhesion with the assembly when trimmed
too much.  Better to mask the area (Tempseal 300 in our case) than take a
chance.  Besides, IPC-A-610 9.1.2 Conformal Coating - Coverage addresses
adhesion concerns and also states coating should only be where specified and
not where it isn't specified (with allowances for application method).
Granted, if your customer agrees to something (coating acceptability) that
supercedes everything else including IPC specs.

Hans

~~~~~~~~~~~~~~~~~~~
Hans M. Hinners
Materials Engineer (Process & Manufacturing)
Warner Robins Air Logistics Center
Avionics Production Division
Precision Attack/ Radar/Manufacturing Branch
Engineering Section
380 Second Street, Suite 104
Building: 640, Mail Stop: LYPME
Robins AFB, GA 31098-1638
Voice: (478) 926 - 1970 Fax: (478) 926 - 7164
mailto:[log in to unmask]
http://www.robins.af.mil


-----Original Message-----
From: Peter Swanson [mailto:[log in to unmask]]
Sent: Tuesday, August 29, 2000 8:53 AM
To: [log in to unmask]
Subject: [TN] Scoring & CC


What are people doing when conformal coating panels of multiple boards
which are scored for later separation?

Will coating get into the scored grooves and make depanelling difficult
and potentially damage the coating?

TIA,
Peter
--
=========================================================
Peter Swanson            [log in to unmask]
INTERTRONICS                http://www.intertronics.co.uk

INTERTRONICS is dedicated to providing quality material,
  consumable and equipment solutions to the electronics
manufacturing and other technology based industries, with
   the highest levels of technical support and customer
                         service.

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