Homebrew PCBs

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]
>
> 



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