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
Celebrating 18 years of Engineering Innovation (1984 - 2002)
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