I am convinced that Colin has hit it spot on the money, B Stage is reactive, and will almost certainly react with Copper, and absorb it.  Perhaps a key question is, does this matter?

Rudy Sedlak
RD Chemical Company

Colin McVean <[log in to unmask]> wrote:
I would be concerned about the possibility of contamination into the
resin with etching solutions, which may stain and change properties etc
which will then be bonded onto a sub-assembly

If your talking about a single stage "B" stage with around 50-80uM of
resin, there may be handling issues, as the material is not as "solid"
and flexible as it would be after the change in rheology excursion
through the press. A 2 stage "B" and "C" may be more suitable for
handling, but the same concern refers as above to the "B" stage.

Colin McVean
Production Manager
Artetch Circuits Limited
Tel: 01903 725365

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of James W. High
Sent: 05 April 2005 16:35
To: [log in to unmask]
Subject: [TN] Etching resin coated copper (RCC)

RCC is a copper foil coated with B-staged epoxy resin. Is it possible
to
etch a pattern in the copper while the epoxy is still in the B-stage?
In
other words, will the chemical etchant attack the as yet not fully cured
epoxy? If anyone has actual experience doing this, please let me know.

Thank you,
James High

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