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Subject:	Re: Conforma Coat (Urethane) & bubbles
From:	Phil Nutting <[log in to unmask]>
Reply To:	TechNet E-Mail Forum <[log in to unmask]>, Phil Nutting <[log in to unmask]>
Date:	Tue, 24 Jan 2006 10:29:29 -0500
Content-Type:	text/plain
Parts/Attachments:	text/plain (49 lines)

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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