We are using Humiseal 1B31 with Thinner 521. The coated gone thru' 22 cycles of
static burn-in , temp profile range from -40 to +85 deg. C.

Regards

Richard Haynes wrote:

> What temp cycle and coating and solvent?
> Richard
> -----Original Message-----
> From: Lum Wee Mei <[log in to unmask]>
> To: [log in to unmask] <[log in to unmask]>
> Date: Monday, August 31, 1998 10:28 PM
> Subject: [TN] Bubbles from conformally coated board
>
> >The test engineer came back to us to complain that bubbles are found
> >along the edge of the power modules after going through the temperature
> >cycling tests. This problems are found on both coated boards. The power
> >modules are mounted completely flushed onto the board and subject to
> >conformal coating using the diping method. The coated board undergo QC
> >to ensure all components are completely coated, inlcuding the edges
> >around the modules.
> >
> >What could be the problem?
> >
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