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March 2001

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Subject:
From:
Phil Crepeau <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Fri, 2 Mar 2001 10:55:32 -0800
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hi,

you might consider using a polyurethane coating that has been around for decades and is still used in aerospace applications.  it is very versatile.  cab-o-sil can be added to it to thicken it up which means you could probably get by with just one application.  it is used on assemblies that have glass diodes with no problem that i'm aware of. the material is solithane 113 (http://www.uniroyalchemical.com/solit113.htm).

phil

-----Original Message-----
From: Roger M. Stoops [mailto:[log in to unmask]]
Sent: Friday, March 02, 2001 8:29 AM
To: [log in to unmask]
Subject: [TN] Maximum Thickness of Concoat


Y'all,
Question engineer asked me today,  how thick can polyurethane coating be
applied?  We apply three coatings with the following procedure:
1) dip  2) dry for 2-3 hours to eliminate most solvent vapors  3) bake for
4 hours @ 60 deg C  4) repeat until 3 coats.  Third coat is also baked.
Question to my able colleagues:  Anybody know of any long-term problems
with this method?  Any test results?
We need to do this to cover all sharp edges for electrical isolation during
operation in potentially high moisture environment.  Specifically, a
housing that can fill with condensation before draining away, and we can't
seal enclosure.  Considered paralene, but it costs more to coat the board
than to build it...
TIA
Roger M. Stoops, C.I.D., PCB Designer


Trimble
Engineering and Construction Division
5475 Kellenburger Rd.
Dayton, OH 45424-1099 USA
Ph: +01 937.233.8921 or +01 937.233.4574 ext 288
Fax: +01 937.233.7511

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