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| Date: | Tue, 24 Jan 2006 09:34:07 -0600 |
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It could also be a case that something in the potting compound is
inhibiting the cure reaction, allowing bubbles to form later in urethane
that is not fully cured. If the potting compound is not completely cured,
there could be some chemical critters running around causing havoc. Are
you thinning the urethane to spray? Got any pictures that Steve could put
on his web page to look at?
Doug Pauls
Phil Nutting
<PNutting@KAISERS
YSTEMS.COM> To
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01/24/2006 09:29 Re: [TN] Conforma Coat (Urethane) &
AM bubbles
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Phil Nutting
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YSTEMS.COM>
Kelly,
Sounds like either a chemical reaction or an air void that is working
its way to the surface during heat curing.
Phil Nutting
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Kelly Morris
Sent: Tuesday, January 24, 2006 10:25 AM
To: [log in to unmask]
Subject: [TN] Conforma Coat (Urethane) & bubbles
We've got a problem here, where we're hand spraying a urethane conformal
coat on over a rectangular inductor.
The inductor body is a plastic tube, with potting to fill.
The top is not always flat (sometimes concave).
The problem is that bubbles appear in the conformal coat on the potted
surface, sometimes right after bake and sometimes days after.
Any ideas on what the root cause is and how to prevent the bubbles?
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