Homebrew PCBs

Okay, will do some side-by-side comparitive tests.  I don't have 
much left of the material I was using, but hopefully there is enough 
here that is big enough to do some good comparisons.

Thanks!
Chris




--- In Homebrew_PCBs@yahoogroups.com, "Stefan Trethan" 
<stefan_trethan@g...> wrote:
>
> On Mon, 07 Nov 2005 22:29:54 +0100, lcdpublishing  
> <lcdpublishing@y...> wrote:
> 
> > Last week you all may remember me having a ton of problems 
getting
> > toner to stick to some PCB material.  Alan suggested that I pre-
etch
> > the board to see if that would help.  It was tried and seem to 
improve
> > the adhesion on the smaller test samples, but not on the larger
> > boards.
> > I am wondering if any of you chemically smart folks here can 
shed some
> > light on what would happen to silicone when imersed int he ferric
> > chloride?
> > This new board material is rather shiny, more so than the 
previous
> > material I have bought in the past.  So I suspect that there is 
some
> > sort of coating on the boards that is causing me these problems.
> > Thanks for the input!
> > Chris
> 
> 
> I'm not chemically smart, but silicone sealant is not attaacked by 
CuCl. I  
> dunno about silicone oil/grease but i do no think it is cleaned 
off.
> 
> Make sure first it is really the material. Get some old stock and 
make  
> 100% identical test. I do suspect it might be something else.
> 
> ST
>