Also as a FYI, we do our potting operation at the end, over the conformal coated boards.....

Amol Kane
M.S (Industrial Eng.)
Process Engineer
Harvard Custom Manufacturing 
941 Route 38  Owego, NY 13827
Phone: (607) 687-7669 x349
[log in to unmask]

 -----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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