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April 2003

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Subject:
From:
Charles Caswell <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Wed, 16 Apr 2003 07:04:25 -0500
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Sorry, I did miss the real question. I have tried various tapes. They help but none are really effective. If there is enough clearance I use latex masking to make a dam around the area to be stripped.
Charles

-----Original Message-----
From: [log in to unmask] [mailto:[log in to unmask]]
Sent: Tuesday, April 15, 2003 7:41 PM
To: [log in to unmask]
Subject: Re: [TN] Con Coat Stripper masking materials


Thanks, Charles,

We've been using IPA or Forane (still allowed here until the end of next
year), but find that it attacks things like PC flex mask and tape
adhesives, especially if you have to soak a board for an hour or so. It's
largely because of the solvent strippers doing this and also evaporating so
fast that coating reasidues dry back onto the board (in the wrong places
sometimes), that I am considering using dedicated strippers. These might
not evaporate before I can get the boards into a cleaner to remove all
stripping residues.

Whatever stripping agent you use, my question is not just "What stripper do
you use?", but mostly "What masking do you use that's resistant or
impervious to the stripper you use?"

Peter



Charles Caswell <[log in to unmask]>    15/04/2003 08:11 PM
Sent by: TechNet <[log in to unmask]>

Please respond to "TechNet E-Mail Forum."; Please respond to Charles
Caswell

              To:  [log in to unmask]
              cc:  (bcc: DUNCAN Peter/Asst Prin Engr/ST Aero/ST Group)
              Subject: Re: [TN] Con Coat Stripper masking materials








Gee, for 1B31 I just use alcohol to strip. Isopropyl works fine. If this
sperads too much you might try acetone, just keep it off of plastics.

-----Original Message-----
From: [log in to unmask] [mailto:[log in to unmask]]
Sent: Monday, April 14, 2003 9:36 PM
To: [log in to unmask]
Subject: [TN] Con Coat Stripper masking materials


My second problem of the day:

Does anyone have any information of any kind - specs, data sheets,
experimental results, recommendations - on masking materials that are
resistant to Conformal Coating Stripping Agents. General information may
do, but I'm particularly interest in masking for Humiseal's 1080, used for
stripping their 1B31 Acrylic coating. We have coated boards needing mods
and repairs with subsequent ICT (In-Circuit Testing this time, not Ionic
Cleanliness Testing) prior to re-coating. I want to be able to mask off
(internal and external) connector contacts and the likes to stop them
becoming contaminated with stripped coating and stripper residues.

To mask the  connectors, effectively, I'm looking for tapes, curable
compounds, boots, etc - anything that will reliably mask my connectors
against the stripping agent during the 60 minutes or so of stripping
process.

TIA

Peter

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intended recipient, please delete it and notify us immediately; you should
not copy or use it for any purpose, nor disclose its contents to any other
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