thanks Adam, one can get water glass at most drug
stores, readily available. i guess i am just going to
have to run some tests. thanks again
mebo
--- Adam Seychell <
adam_seychell@...> wrote:
> Dried water glass will dissolve in water, but very
> slowly. I'm not sure how
> fast dried water glass it will dissolve in acid. I
> know they make silica
> gel crystals by mixing a solution of water glass and
> sulfuric acid to form
> colloidal SiO2, then its dried somehow.
> I guess your best bet is to try it with dilute HCl,
> that's assuming some
> water glass is no too difficult to get hold of.
>
> pebo festus wrote:
>
> > --- In Homebrew_PCBs@yahoogroups.com, Adam
> Seychell
> > <adam_seychell@y...> wrote:
> >
> >
> >>The sodium silicates are alkaline, so any contact
> from acidic
> >>copper etchants will only neutralize and you end
> up with a
> >>solution of silica gel (colloidal SiO2) and the
> salt.
> >
> >
> > adam are you telling me that even if the water
> glass is set and hard
> > the acids wiil desolve it?. i have been advised
> that gycol and water
> > glass will also harden if mixed, will the acids
> soften this combo
> > also?.
> >
> > i was toying with the idea of coating the pcb with
> water glass and
> > print with glycol. or maybe the other way around,
> coating with gylcol
> > and printing with water glass. there just has to
> be a better way.
> > mebo
> >
> >
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>
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