Homebrew PCBs

Hello Ballendo,

Specified tank materials for the bungard system are:
Cleaner DS270      : Stainless steel or PPE
Predip DS400       : PVC or PPE
Activator DS500    : PVC or PPE
Intensifier DS650  : PVC or PPE
Plating bath CU400 : Not found, but Polypropylene anode bags are OK

For this reason I decided to weld the tanks from Polypropylene (PPE)
To do this I made a special tip for my temperature controlled 
soldering station. It cuts through the joint and seals the two sheets 
of material together on the full depth of the sheet (3mm) Should 
probably also work for PVC and other thermoplasts.
However it takes some time to get the right speed, pressure etc.
Sometimes it works better then others, but I found it with my 
materials much more reliable than welding using a heat gun.
I uploaded some pictures of this tip to:
http://photos.groups.yahoo.com/group/homebrew_pcbs/lst?.dir=/impala&.s
rc=gr&.order=&.view=t&.done=http%3a//briefcase.yahoo.com/

Sorry they are a bit unsharp, but I had to use some additional lenses 
to get the close-up pictures, and not enough hands to hold it all 
steady.


Also I found some information on the chemicals themselves. I first 
ordered the Bungard chemicals for a starting point, but want to test 
the chemical compositions found as well. Those chemicals seem to work 
like the Bungard chemicals, so I can try one tank at a time to test 
if they are useable.

These make them yourself chemicals are based on United States Patent 
5,071,517 link:
http://patft.uspto.gov/netacgi/nph-Parser?
Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=/netahtml/srchnum.htm&r=1&f=G&l=5
0&s1=5,071,517.WKU.&OS=PN/5,071,517&RS=PN/5,071,517

And, searching for the link, I also found the next two links, which 
might be of interrest. (I didn't read them yet)

http://patft.uspto.gov/netacgi/nph-Parser?
Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=/netahtml/srchnum.htm&r=1&f=G&l=5
0&s1=4,933,010.WKU.&OS=PN/4,933,010&RS=PN/4,933,010

http://nr.stic.gov.tw/ejournal/ProceedingA/v23n3/365-368.pdf

Apart from these links, I also found some more information, which I 
can dig up if anyone wants to start trying.


Regards,

Gertjan




--- In Homebrew_PCBs@yahoogroups.com, "ballendo" <ballendo@y...> 
wrote:
> 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.
> >