Homebrew PCBs

I think you can get 35% peroxide online at ebay and some other sites. 
Apparently it is ingested for some health reasons (google food grade 
peroxide). See 
<http://cgi.ebay.com/35-Food-Grade-HYDROGEN-PEROXIDE-1-GALLON-Free-dropper-/270766223522?pt=LH_DefaultDomain_0&hash=item3f0aecb0a2> 
for an ebay example. I use 40 Volume (12%) peroxide that I get from a 
beauty supply place nearby.

Mark

At 01:58 AM 7/18/2011, you wrote:
>Don't know about the ratios, but I think the H2O2 is 35 VOLUME , which
>is ~10%.  Beauty shop suppliers will have 30 and 40 VOLUME, which
>correspond to ~9% and ~12% H2O2.  It's relatively inexpensive - a quart
>cost me about $5.00 last time I bought some.
>
>Norm
>W6NIM
>
>On 7/17/2011 8:07 PM, Kamal Shankar wrote:
> >
> > Thanks Ben.
> >
> > I read somewhere that the best mix for H2O2 + HCl is:
> >
> > "20% H2O2 at 35%
> > 20% HCl at 32%
> > 60% water to etch the copper. This needs to be done outside (vapors),
> > the board is etched in 30s"
> >
> > Would a beauty shop have 35% H2O2?
> >
> > I also read that some people use a heater to warm up  HCl + H202 or
> > CuCl2 etchant just like in case of FeCl3!
> >
> > Does heating help?
> >
> > >________________________________
> > >From: Ben L <bhleavi@... <mailto:bhleavi%40yahoo.com>>
> > >To: Homebrew_PCBs@yahoogroups.com
> > <mailto:Homebrew_PCBs%40yahoogroups.com>
> > >Sent: Sunday, July 17, 2011 7:04 PM
> > >Subject: [Homebrew_PCBs] Re: Hydrogen peroxide mixing
> > >
> > >
> > >
> > >
> > >> I am finding it difficult to obtain > 3% H202 myself, and since the
> > only purpose of H202 is to generate oxygen, I would very much like to
> > know how to generate ozone instead, as I believe it's a much stronger
> > oxodizing agent?
> > >>
> > >> Also - I meant to ask everyone: is heating HCl + H202 or CuCl2
> > etchant useful the way it is in case of FeCl3 or is it simply a
> > misconception?
> > >>
> > >
> > >I normally use a air pump to pump air into the tank.
> > >
> > >Try a Beauty Supply for stronger than 3%.
> > >
> > >Ben_,___
> > >
> > >
> >
> > [Non-text portions of this message have been removed]
> >
> >
>
>
>
>[Non-text portions of this message have been removed]
>
>
>
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