Homebrew PCBs

One I had was a blue tube say 2 cm diameter and 3-4 cm long. It felt
hard but brittle.  I thought it was some sort of foamed glass but when
it fell apart it was clearly some sort of plastic.  It turned white. 
I still have some bits of it floating in my etchant...

The other one was grey and some what like foam.  definitely plastic of
some sort.  It lasted only slightly longer.

Do you need bubbles or agitation?  These days I just let the end of
the air hose dangle in the etchant and the pressure causes it to go
back and forth giving me enough stirring so the etch is reasonably even.

Phil

--- In Homebrew_PCBs@yahoogroups.com, "Stefan Trethan"
<stefan_trethan@g...> wrote:
> On Wed, 09 Mar 2005 17:22:39 -0000, Phil <phil1960us@y...> wrote:
> 
> >
> >
> > I've have very bad luck with several of the fish tank bubblers and
> > CuCl (air stone is one product name).  They fell apart in the CuCl
> > after around 6-8 hrs exposure.
> >
> 
> Phil, which material were these?
> I got a round one with the pump that is a blue material, very much
like a  
> grinding stone in texture, very hard.
> I wonder if there are any that hold up in CuCl...
> 
> ST