Homebrew PCBs

On Mon, 07 Nov 2005 22:29:54 +0100, lcdpublishing  
<lcdpublishing@...> 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