Hi
It is my understanding that H2O2 will decompose readely into H2O and O2
hence you will have to add fresh H2O2 to existing solution until the etchent
becomes too dilute.
Thanks
Regards
Gaurav
On Mon, Jan 5, 2009 at 8:36 AM, Wayne Topa <linuxone@...> wrote:
> leon Heller wrote:
> > ----- Original Message -----
> > From: "Matthew Mucker" <matthew@... <matthew%40mucker.net>>
> > To: <homebrew_PCBs@yahoogroups.com <homebrew_PCBs%40yahoogroups.com>>
> > Sent: Sunday, January 04, 2009 11:15 PM
> > Subject: [Homebrew_PCBs] Shelf life of HCl/H2O2
> >
> >
> >
> >> I etched my first board a few weeks back with HCl/H2O2 and was very
> happy
> >> with the results.
> >>
> >> I saved the etchant, since I'd only etched one small board with it, and
> >> today tried to etch a second board. I saw no evidence of a chemical
> >> reaction at all.
> >>
> >> Now, I know that H2O2 will spontaneously decompose, but it seems that
> the
> >> etchant should last longer than a couple of weeks. Has anyone else had
> >> issues with storing etchant and using it at a later date? Is there
> >> anything
> >> I can do to increase the shelf life of my etchant?
> >>
> >
> > You need to make up fresh etchant each time, it doesn't keep.
> >
> > Leon
> >
>
> Leon
>
> I found a bunch of Curric Chloride (HCL+H2O2) links on Answers.com
> that say it does keep.
> I even went back in my archived mail and found a message from you, on
> Feb 22 2006, where you
> said you stored yours in plastic Milk bottles.
>
> I hope you just forgot because I just got together come HCL and 30%
> H2O2 to ecth a bunch of small
> boards. I was sure I had read some time ago that is did store for a
> long time with rejuvination.
>
> Am I mis-remembering, which I seem to be doing a lot lately, or has
> something changed.
>
> Wayne
>
>
>
--
Gaurav Verma
Email - Gaurav.Verma.MCA@...
Phone - 9910732960
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