If specimens acn be put into a SEM/EDX system, you can at least get an
elemental suggestion of what it is...

> -----Original Message-----
> From: [log in to unmask] [SMTP:[log in to unmask]]
> Sent: Wednesday, August 12, 1998 2:39 PM
> To:   [log in to unmask]
> Subject:      [TN] Unidentified Material Between Conductors
>
> All,
>
> We are having some problems with a backplane PCB.  There appears to be
> some sort
> of material bridging some conductors under the conformal coat on the
> solder side
> of the PCB.
>
> The material appears in various colors, but mostly appear as a
> blue-green to
> black color.  This material is also conductive (which is how we found
> the
> problem.....the unit failed electrical test).
>
> The boards are not subjected to any environmental stresses prior to
> discovering
> this problem.
>
> Any hints or suggestions??  E-Mail me for additional information
> (Photo's will
> also be available soon).
>
>
> Steve
> [log in to unmask]
>
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