Hi Helena,
Richard provided:
> http://www.taconic-add.com/pdf/taconic-laminate_material_guide.pdf
>
This Material Guide does not give Tg, or the modulus of elasticity; the CTE
values given are compatible with FR-4; you do not say what Ni plating is used
[be careful with electroless Ni, it can lead to much earlier failures of the
vias; electrolytic Ni enhances via relaibility].
I would still be worried about PCB warpage during the soldering process(es)
as the result of the asymmetric lay-up.
Werner
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