Dr. Dave:

I think that you are one of the industries bright lights, but sometimes you
can advance some of the wierdest questions.

Dave, at the end of the day, we all want processes that have as wide a window
as is possible, but with some processes, it is simply not possible, and with
others, it may cost something, either economic, or from a quality point of
view, and simply is not worth it.

A classic example is the etcher, who would ever try to set up an etch process
that could handle any weight of Copper, from 1/4 oz to 3 oz???

Clearly this is a question that must address not only the particular process,
but also the variation in materials that it is possible/likely to see.

Rudy Sedlak
RD Chemical Company

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