> I think I am spoiled,
>
> The first batch of boards I had were of some other substrate and the
> copper pealed off easily.
>
> I can get muriatic acid from the hardware store, so that is easy
> enough.
>
> Hydrogen dioxide... I've seen that on the list before. Seems I need
> to scan the list for quality and sources.
>
> IIRC, it is not the diluted stuff one buys to put on cuts.
>
> I just check the polls and there is only the poll about a minimum CNC
> machine.
>
> I wonder if we should put together a poll on what method each of us
> use to make boards.
>
>
> Dave
Good idea the poll.
actually you need H2O2 which is dihydrogen dioxide i think, but everybody
calls it hydrogen peroxyde.
I get it from a chemicals shop, very cheap there.
other sources are pool supplys, wood bleaching.
You NEED to find stuff with 30% or 35% concentration.
The pool stuff is about 20% and is the lower limit.
The food/desinfection/hair bleaching stuff is mostly 3% or less,
meaning you need a huge amount.
There are other etchants too, like ferric cloride and such...
Mechanical removal:
I expect the following to work:
take a round rod of steel, heat it, apply solder, apply
solder on one edge of the PCB solder the rod to the copper.
let solidify, then rotate the rod, coiling up the copper like a fish tin
lid.
Because of the heat from the soldering the glue will already be attacked,
it will
lift off i think. once you have a piece lifted it should roll off without
rupture.
I never tried this but from "accidents" when i didn't want it to lift at
all i expext
it to work.
You can try it and maybe you can aoid the etching alltogether.
ST