Dwayne,
I agree with your comments about acid... ferric chloride can make a
mess, and if anyone has a stainless steel sink, better be careful it
will eat holes in it...
I have my FC in a TupperWare breakfast cereal container, clearly marked,
and never pour the stuff, I simply fill the sink with hot water, stand
the container in it and remove the lid. Then I hang the pcb in the FC ,
that way there are less chances of an accident.
About "Caustic Soda" That is what's it's called in England, and when I
tried to find it here in Houston I asked for Caustic Soda and people
looked at me as if I came form mars or something similar.... Finally I
found Red Devil Lye and of course it is the same stuff... Norwegian use
it to make "Lute Fisk" that's nasty stuff...
The same story about denatured alcohol, I remember looking for
"methlylated spirits" until I found an Eckerds guy that had a
dictionary.... and we think we have a common language :-)
hansw
Dwayne Reid wrote:
> At 12:54 PM 5/3/02 -0700, Randy Knutson wrote:
>
> >Greetings,
> >
> >I have a question concerning the 'wet method' of making circuit
> boards.
> >Since I am new to making circuit boards I did a search a while ago
> and
> >found kepro circuit systems and purchased all the items to make
> circuit
> >boards using the dry film method. After it was all said and done and
> >everything was shipped I had quite a bit of money invested. Since I
> have
> >been following this group I have heard people using 'lye' as a
> developer.
> >My question is this: Are there any common chemical substitutions
> which
> >could be used replace any of the development stuff kepro sells?
> Example:
> >developer=lye, stripper=bleach??, tinplating = ?, acid= ? etc.
>
> First, I strenuously object to the term "ACID" when talking about
> etchant. Etchant MAY contain acid (I use Ammonium Persulphate
> catalyzed
> with Sulphuric Acid) but Ferric Cloride is not strong enough to be
> called
> acid. Neither is Ammonium Persulphate.
>
> As far as the rest is concerned, it depends upon the photo chemistry.
> For
> example, DuPont's Riston dry film laminate uses Potassium Carbonate as
> the
> developer: this is also known as Soda Ash. Same with the stripper:
> Sodium
> Hydroxide is more commonly known as Caustic Soda.
>
> Hans uses Cool Amp for silver plating boards - I will soon be ordering
> some
> and trying it since he has had such good results with it. The initial
>
> price is a tad steep but it sounds like it lasts a LONG time.
> (Thanks, Hans!)
>
> dwayne
>
>
> Dwayne Reid <dwayner@...>
> Trinity Electronics Systems Ltd Edmonton, AB, CANADA
> (780) 489-3199 voice (780) 487-6397 fax
>
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