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Wed, 2 Sep 1998 15:20:08 +0800 |
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DSO National Laboratories |
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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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Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information.
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