Does it really matter if there is hex Cr on the copper surface? It will
never reach the end product. OK, it will end up in the PC Fab guy's
waste water stream, but he has worse things than this to contend with,
n'est-ce pas?

Let's have a little pragmatism.

Brian

Eddie Rocha wrote:
> I understand that copper foils are protected with chromates
> (Cr6) prior to producing laminate. Since this is an RoHS
> banned substance I need to understand why all my laminate
> suppliers have certified their material to be RoHS
> compliant.
>
> One supplier responded by stating that Cr6 is reduced to a
> state of Cr3 or Cr0 which is not a restricted substance.
>
> Can somebody explain how it goes from a state of Cr6 to one
> of the reduced states and why sometimes Cr3 versus Cr0?
>
>
> Thank you,
> Eddie Rocha
>
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