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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