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January 2006

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Subject:
From:
"Blair K. Hogg" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Blair K. Hogg
Date:
Tue, 24 Jan 2006 07:39:44 -0800
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This is just a guess, and nothing more, but could there possibly be outgassing from something in the component? I'm pretty skeptical of this, since any outgassing should have already occurred, but may be happening due to the rise in temperature?

>>> [log in to unmask] 01/24/06 10:25AM >>>
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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