Homebrew PCBs

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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