Homebrew PCBs

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 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