Synth-DIY Yahoo! Groups Archives

photo chemicals name

2008-07-01 by palplr

Can any one say what are the easily avaliable photo checmicals to
spray or paint on the bare pcb for either positive or negative print.

If not can we make from some bunch of checmicals.

I would appreciate instead of commerical name the checmical name to be
given so that i can check with the chemcicals company which is
avliable near by my house.

Regards

R.Pal

Re: [Homebrew_PCBs] photo chemicals name

2008-07-01 by Adam Seychell

palplr wrote:

> Can any one say what are the easily avaliable photo checmicals to
> spray or paint on the bare pcb for either positive or negative print.
>

I don't think you can easily formulate our own liquid photoresists that
perform as today's commercial photoresists. Exact ingredients and
manufacture process would be a trade secret, and to get close you have
to be expert in that field of chemistry. Because you ask the question I
assume you have very limited knowledge of chemistry just as I do. Your
best bet is to study chemistry and search the patent databases.

Good luck,

Adam

Re: [Homebrew_PCBs] photo chemicals name

2008-07-01 by Myc Holmes

Adam is correct. Today's chemistry is pretty sophisticated.

Buy the boards pre-coated, or use the sprray from a can. If you really want,
you can get film that you can lamnate yourself.

I do remember there was a Chromate / gelatin mixture used many years ago.
You may still find references to it under screenprinting.

Myc

On Tue, Jul 1, 2008 at 6:25 PM, Adam Seychell <a_seychell@...>
wrote:

Show quoted textHide quoted text

> palplr wrote:
> > Can any one say what are the easily avaliable photo checmicals to
> > spray or paint on the bare pcb for either positive or negative print.
> >
> I don't think you can easily formulate our own liquid photoresists that
> perform as today's commercial photoresists. Exact ingredients and
> manufacture process would be a trade secret, and to get close you have
> to be expert in that field of chemistry. Because you ask the question I
> assume you have very limited knowledge of chemistry just as I do. Your
> best bet is to study chemistry and search the patent databases.
>
> Good luck,
>
> Adam
>
>

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