Archive of the former Yahoo!Groups mailing list: Homebrew PCBs

Jeremy,

Nice link. Thank you!

Ballendo

--- In Homebrew_PCBs@yahoogroups.com, "Jeremy Taylor" <jt@j...> wrote:
> I intensely researched the chemical options, and in the US
>
> For small scale, inking the holes is the most cost effective, and
cleanest
> method. ie.. if you cant afford the ink you definitely cant afford
the
> chems, and testing, and wetbench, ventilation, filtering, and
effluent
> processing. of desmear, carbon black. and associated neutralizers.
>
> $75 for roughly 12500 holes <50Grams>, That's $0.006 per hole
>
> BTW You can reuse the excess ink that you remove if you are very
careful and
> use a recovery jar in your vacuum line If it's getting to hard, I
glob it on
> the board, and put a few drops of acetone on it, and quickly smear
it in. so
> far it's worked perfectly.
>
> The EPA has a great breakdown with enough info to point you toward
the
> makers of the chems
> Also discusses all available techniques.
> Conductive ink is listed as "currently in development" <g>
> http://www.epa.gov/dfe/pubs/pwb/tech_rep/ctech/index.htm
>
> As for PVC Cement and Acrylic glue, neither are really glue, they
are both
> fusers, that chemically melt the edges in contact and fuse them
together --
> never to be undone. I've built a number of saltwater filter boxes
with clear
> acrylic using the "glue" in a syringe just applying it into the
joint, and I
> have some that are 12years old, no problem. However saltwater is not
> acid...I know that PP, HDPE, and PVC all come before Acrylic or
anysort of
> ABS for longterm chemical and temperature resistance
>
> JT
> ----- Original Message -----
> From: "ballendo" <ballendo@y...>
> To: <Homebrew_PCBs@yahoogroups.com>
> Sent: Sunday, March 14, 2004 6:53 PM
> Subject: [Homebrew_PCBs] THP line questions was Re: Welding PVC - OT
>
>
> > Adam, Markus Z,
> >
> > Will pvc (cemented) stand up to the chemicals of your THP system?
> > What about glued acrylic?
> >
> > Next, Has anyone found a good US supplier of the "commercial" THP
> > chemicals, like the Bungard chemistry Markus uses? Is Bungard
sold in
> > the USA?
> >
> > I don't want to mess with the black hole techniques, or vacuuming
> > away the expensive hole wall activator...
> >
> > Thank you in advance,
> >
> > Ballendo
> >
> >
> >
> > --- In Homebrew_PCBs@yahoogroups.com, Adam Seychell
> > <adam_seychell@y...> wrote:
> > You are correct saying that if something can
> > > be glued then its should be glued and not welded because its
> > > simpler. PVC pipe fittings is an example of glued plastic.
> > > Sometimes a the flat face of a PVC block or sheet can be glued
to
> > > another.
> > >
> >
> >
> >
> >
> >
> > Be sure to visit the group home and check for new Bookmarks and
files:
> > http://groups.yahoo.com/group/Homebrew_PCBs
> > Yahoo! Groups Links
> >
> >
> >
> >
> >