Frank
I don't use Sodium Hydroxide I just use the recommended method that was advised by the local council waste adviser when we used to dispose of 3 x 5 gallon lots at the company I worked for here in the UK. Just dilute it 5:1 with water and pour down the drain.
I don't suffer from insanity I enjoy it!
--- On Tue, 6/8/10, Frank P <qz9090@...> wrote:
From: Frank P <qz9090@...>
Subject: [Homebrew_PCBs] Re: Etching container
To: Homebrew_PCBs@yahoogroups.com
Date: Tuesday, June 8, 2010, 6:24 PM
Malcolm,
Where do you get sodium hydroxide?
Also, is your disposal method the "official, recommended" method of disposal?
Thanks.
--- In Homebrew_PCBs@yahoogroups.com, "James" <jamesrsweet@...> wrote:
>
>
>
> --- In Homebrew_PCBs@yahoogroups.com, Malcolm Parker-Lisberg <mparkerlisberg@> wrote:
> >
> > You can flush Ferric Chloride down the drain, it is already used by water treatment plants.
> >
> > Malcolm
> >
> > I don't suffer from insanity I enjoy it!
> >
>
>
>
> You sure don't want to do that if you have any metal pipes or fittings. Not to mention it's illegal (in the US anyway) and the dissolved copper is highly toxic to marine life.
>
> Mix it with sodium hydroxide and you can pour off the saltwater that it makes and dump the precipitate in a sealed container to throw in the trash.
>
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