If you are interested in fooling around with high strength peroxides (against my advice for beginners since the drug store 3% is strong enough). I would just like to put in my 2 cents. At concentrations above 30% you want to keep any organic compounds (like acetone) far away. You can form organo-peroxides that are unstable high explosives. The amount of water left in 30% peroxide is just at the borderline to be able to quench this sort of explosion, but you can still end up with it boiling in your face. Always keep them in a hydrophobic membrane-vented container away from light and in a chemical safe refrigerator. 30% peroxide has 100x its own volume of oxygen, so keeping it in an enclosed space may produce a highly oxidative atmosphere where things that are normally inflammable burn vigorously. Make sure no transition metal contamination enters the bottle or you will have nothing but water in a week or two. The only reason I mentioned the stuff a few weeks ago was to tell you how I add peroxide into my enchant after it has been used once and stored for a while.
Good luck and stay safe,
JRod
--- In Homebrew_PCBs@yahoogroups.com, "RJ" <rj3819@...> wrote:
>
> well .. used this formula ..
> C1V1 +C2V2 / V1 + V2 and got 19% I think ..
> Hopefully thats the correct formula ..
> Going to use 9% H202 with a 2:1 ratio of H2O2 to HCL
> according to the calculator it should be close.
>
> Randy
>
> --- In Homebrew_PCBs@yahoogroups.com, "RJ" <rj3819@> wrote:
> >
> > Mixed it . not sure if its exactly 17% ..
> > But at a swimming pool supply place you can
> > get 35% H2O2 .. and I diluted it with the 3%
> > stuff you get in the store ..
> >
> > Randy
> >
> > --- In Homebrew_PCBs@yahoogroups.com, "designer_craig" <cs6061@> wrote:
> > >
> > > Randy,
> > > Where did you get your 17% Peroxide?
> > >
> > > Craig
> > >