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March 2006

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Subject:
Re: chromates on copper surface (Cr6)?
From:
Brian Ellis <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Brian Ellis <[log in to unmask]>
Date:
Wed, 22 Mar 2006 09:32:42 +0200
Content-Type:
text/plain
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text/plain (43 lines) 
Afterthought. Laminate itself does not fall into RoHS/WEEE until it is
actually fabricated into an electrical component.

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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