Homebrew PCBs

Strong HCl will go very slowly through HDPE bottles, leaving some
residue on the outside that looks like a salt and corroding nearby
steel. Also the plastic will get pitted after a number of years.

H2O2 will also damage HDPE bottles, causing them to go hard and
brittle from the inside. You will hear cracking when you press on the
bottle and see a spidererb of cracks on the inside. Again this happens
after many months.

In any event H2O2 will not stay for long mixed with HCl, it will want
to break down into oxygen and water. This creates pressure which MUST
be relieved or the bottle may break.

I use only glass bottles now, because I store those chemicals for years.

ST



On Fri, May 22, 2009 at 7:06 PM, Philip Pemberton <ygroups@...> wrote:

> Does anyone know if those black plastic "accordion bottles" used for darkroom
> chemistry fall into this category? The ones I have are made from HDPE, if that
> makes any difference.
>