--- In
Homebrew_PCBs@yahoogroups.com, "Stefan Trethan"
<stefan_trethan@...> wrote:
>
> On Tue, 11 Jul 2006 21:34:15 +0200, fenrir_co <fenrir@...>
> wrote:
>
> >
> > I used Plumber's Goop or Household Goop when I built vertical
> > etching
> > tanks, rather than silicone. I never had a problem with leaks, but
> > I
> > used a rather large amount, just to make sure. I like this glue
> > for
> > pretty much everything, though it's pretty thick, so there are
> > some
> > jobs for which it's a bit too messy.
>
> Don't sell that here. silicone is pretty good stuff on glass.
> I'm still unsure what goop really is, some solvent based adhesive is
> the
> closest i could come so far.
I believe a similar glue is E6000, yes, it's solvent based. Pretty
strong, I've glued glass to chromed metal with it.
>
> > I used to keep the etching tank in a 13 qt sweater box (#5
> > plastic),
> > and now use the #5 boxes directly. Double-boxing it would probably
> > be
> > a good idea - if you leave your supplies outside, periodicly check
> > to
> > make sure the plastics aren't getting brittle.
> > Never ever store used etchant (or anything, really) in those thin
> > 1-gallon milk/water bottles, either. Heavier #2 containers are the
> > best thing to keep it in, then store those inside a bigger
> > leak-proof
> > tub.
>
> I don't know what #2 or #5 plastic is, i'm not familiar with the
> american
> system (btw. another example of the american obsession to categorize
> things in meaningless numbers, gauges, forms, sizes ... ;-).
>
> I think #2 might be PP (polypropylene), but i really have no idea
> what #5
> might be. Maybe ABS? Large boxes might likely be made from ABS. Let
> me
> know if you know the human-brain-compatible name or acronym for #5.
>
> I wouldn't use the thin PET bottles for long term storage, but
> they'll do
> just fine until tomorrow. PET or PE isn't really that suitable for
> CuCl
> long-term anyway because the HCl tends to go through it in a very
> strange
> fashion. If #2 really is PP, it seems OK for FeCl, but i don't
> expect it
> to be different than PET or PE for CuCl, so i would avoid it.
>
>
> ST
>
#2 is High Density Poly-Ethylene, which tends to be highly chemical
resistant (though there are solvents that will eat right through it.
Usually used for food (milk, water jugs) and chemicals (motor oil,
transmission fluid, drain cleaner). It used to be rare to see, but
nowadays I also find paint thinner and acetone in it.
So far none of my experiments with base level radio shack FeCl3 and
various amounts of peroxide, hydrochloric acid, and anhydrous FeCl3
have melted through it over the past three years.
#5 is Polypropylene, not quite as chemical resistant. My etchant
hasn't eaten through any of the sweater boxes I've used, but since
everything is left outside, I replace them once a year or so, because
the plastic will become dry and brittle, and break when picked up with
heavy things in it.
I've had thin #2 milk/water bottles spring leaks on me, causing
ungodly messes, though luckily only with acrylic varnish, and not
etchant. Still a mess, but not a catastrophe.