It's probably within the innaccuracy of the EDX.  More important is to check
the solderability. and perform an analysis of some samples by means of
crossection. And see how the IMC looks like. He with the signature 'X' would
love to help you.

Myself. I've accepted 12-13 % P, but that was before the 7-10 % spec was
created.  We never saw any issues with the high P. That does not mean that I
encourage you to neglect the 10 % maximum.

Inge

On 18 October 2011 02:39, Fabien Guizelin <[log in to unmask]> wrote:

> Hi all,
> I am facing a PWA failure at low temperature.  An EDX analysis revealed a
> P-content of 10.4%wt which is outside the IPC-4552 1.2.1 specifications
> (7-10%).   The PCB has an ENIG finish.
> Could I be facing black-pad ?
> How severe is the 0.4%wt additional Phosphorous content ?
> Regards,
> Fabien
>
>
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