How do you cure the urethane"? Is it possible that the outside is curing
before the rest and what you are looking at is shrinkage voiding due to
the z axis depth?

John

John Burke
Senior Manager - Operations , Optichron
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-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Kelly Morris
Sent: Tuesday, January 24, 2006 10:23 AM
To: [log in to unmask]
Subject: Re: [TN] Conforma Coat (Urethane) & bubbles

Steve has put my pictures on his web page. (THANK YOU STEVE!)  The
pictures
are after conformal coat touch up, but they give an idea of the
location,
shape, etc.
They are at:

http://stevezeva.homestead.com/files/Conformal_Coat_Bubble.JPG

http://stevezeva.homestead.com/files/Conformal_Coat_Bubble_2.JPG


On Tue, 24 Jan 2006 09:25:25 -0600, Kelly Morris <[log in to unmask]>
wrote:

>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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