For Everyone's Information:

Hitachi owns the world wide patent rights on the use of amine borane
compounds on reducing oxides to prevent Pink Ring.

And further, there is one other treatment for preventing Pink Ring, (with
oxide), and that is MacDermid's.

The other way that people use to treat Copper to promote bonding is to use
immersion Tin plus a Silane treatment.  This process is called Durabond, and
I think it is owned by McGean Rohco.

In certain circumstances, it is possible to use bare Copper with no
treatment, also.

Most of the time, the PCB customer defines what they want, and the fabricator
must do what they want.

In the US today, most of the PCB multilayers are done with oxide, and most of
those are treated with an amine borane reducing agent.

Rudy Sedlak
RD Chemical Company

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