Steve,

We saw this occur some years ago with smt film caps.  The first few top
layers were peeling off in the aqueous.  I sent a handful back to the
factory for examination.  They responded that they were working on better
adhesion and process compatibility, but also that particular part had 90-100
layers of protective film, so losing a few layers wasn't a problem.  We made
sure that no "flags" were flying off the parts, but otherwise left them
alone.  They behaved fine,  no problems with the customer.   I don't recall
any problems with profile conflicts.

Bruce Tostevin
Benchmark Electronics
Hudson, NH

> -----Original Message-----
> From: [log in to unmask] [SMTP:[log in to unmask]]
> Sent: Thursday, May 23, 2002 9:52 PM
> To:   [log in to unmask]
> Subject:      [TN] Film Capacitors...geeze!
>
> Hi all!
>
> Just started building an assembly that calls out film capacitors to be
> used
> in 64-locations on the board. Processed the assemblies in a typical manner
> as
> one would for most SMT assemblies, and experienced massive failures of
> these
> caps. They are PPS films. Unfortunately, this has been a first for
> me...never
> had to process these caps before. They are delaminating...the layers of
> film
> are flaking off from the caps.
>
> Can anybody tell me how I should assemble these devils? Went to the web
> page
> of the manufacturer, and they have a recommended reflow profile that is
> 2-mins, 45-seconds long...to me, that violates the specifactions that
> Kester
> recommends for their paste to perform...
>
> Is using SMT film caps a bad idea? ( I think I know the answer, but I just
> want a confirming opinion...)
>
> -Steve Gregory-
>
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