Do you have more information on these boards?  Can I use them for prototypes or
is there special equipment involved?

Dennis Plunkett wrote:

> Etching as we know it is becoming a thing of the past. Sinate-Esta PCBs are
> the way to fly, and they are here now! The good thing is that these boards
> are/will be cheaper than equivalent mulit layer FR4, have direct bonding to
> form interconnections, great for RF etc.. (I love this stuff and can rant
> and rave more!) Talk to your manufacturer about these. Some are not doing
> them as yet. Hewlet-Packard have only recently started on them.
>
> Dennis
>
> At 18:59 12/10/99 -0500, you wrote:
> >I heard of a sign etching company that uses ferric chloride for many etch
> >baths,
> >but for zinc, they use nitric acid because of a neat
> >environmental/economical
> >recycling path they found.  They bubble ammonia gas through the spent
> >etching solution
> >to get ammonium nitrate with zinc bound in it.  They SELL that as special
> >corn fertilizer instead of having to pay to get it removed!
> >
> >I would like to hear what Mark's dad thinks of for copper?  Is there a
> >set of low heat, low mist wet chemistry pathways that yields
> >layers of copper plated onto stainless
> >steel collector plates, plus a weak solution that
> >can be turned into soybean fertilizer?
> >
> >What regions have farmland low in trace copper?
> >
> >What other metals are acceptable for prototype PCB's?
> >
> >Tin via wet chemistry?
> >
> >Aluminum via vacuum deposition over polymer insulators/semiconductors on
> >biodegradable celluloid substrates?  Etch it quick in caustic and dry it off
> >in a hurry like a photo print so it doesn't curl?
> >
> >Lot's of paths would be way better than the recycle pathway the Crest
> >toothpaste
> >company found for stannous fluoride in the sixties!  (gulp...)
> >
> >John G
> >
> >> -----Original Message-----
> > they
> >> neutralized the acid I think, then precipitating that Cu2S3 out by
> >> boiling the water off slowly, and taking the resulting nice dry
> >> (pretty!) Green-Blue crystals off to the local disposal site.  (They
> >> concentrated it because disposal was paid on a per-pound basis.  And
> >> they generated a fair amount of liquid, easier to concentrate it.)
> >
> >