Homebrew PCBs

In my knowledge there is no solvent for silicone. Don't ask me how the 
manufacturers of silicone products deal whith this problem.
All this products, is made by mixing some aditives and silicone. 
Imagine this mysterious silicone like microscopic balls, mixed in some 
oil or grease. When you try to remove it, you use acetone. The acetone 
wash aditives but not the balls. Some balls, because there is no 
aditive to stick them in place, will be removed. Never all.

Your problem is allmost sure not a silicone problem, because you can 
etch the PCB. Is a realy weird problem. Maybe is related to copper 
quality like thermal or electrostatic proprieties.



Adrian


--- In Homebrew_PCBs@yahoogroups.com, "lcdpublishing" 
<lcdpublishing@y...> wrote:
>
> I don't think so, but not sure. Like someone mentioned last week, 
> autobody shops have a horrible time dealing with "Fish eyes" in the 
> paint.  This is caused by silicone "waxes" people apply to their 
> cars to keep them shiny and new looking.  I know that laquer thinner 
> doesn't seem to remove it good enough to prevent problems. Don't 
> know about acetone though, never seen the body shops use acetone.  
> However, I scrubbed the boards good with acetone prior to 
> transfering the toner.  
> 
> Gosh this is frustrating.  What was working so perfectly now works 
> horridly.  I hope to get some time to focus on this and get to the 
> bottom of it in the coming weeks.  
> 
> Also, for what it is worth, I tried many different ink jet papers 
> (glossy stuff), pages from magazines, toner transfer paper, and the 
> pulsar transfer paper, and something else of which I can't remember 
> now.  All yielded nearly identical problems, in other words, none of 
> them performed better than the other - so now I know I don't have to 
> buy the expensive papers anymore - just use the glossy papers :-)
> 
> CHris
> 
> 
> 
> --- In Homebrew_PCBs@yahoogroups.com, "Stefan Trethan" 
> <stefan_trethan@g...> wrote:
> >
> > On Mon, 07 Nov 2005 22:59:28 +0100, adicont2 <adicont2@y...> 
wrote:
> > 
> > > Theoreticaly, silicone sealant is chemically inert. So should no
> > > interact whith no other chemical element. This is the reason for
> > > silicone usings in  medicine.
> > > This is also the reason for bad things. Silicone grease is verry 
> hard
> > > to remouve. If an object is contaminated whith this grease...bad 
> news.
> > > Is allmost imposible to paint it, glue it, or etch it.
> > > Adrian
> > 
> > 
> > It can not be solved by solvents like acetone?
> > 
> > 
> > ST
> >
>