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'[EE]: Photosensitive chemical.'
2002\12\14@123725 by A.J. Tufgar

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A friend was telling me about a chemical he painted on copper clad to
make photosensitive PCB's, rather then buying the presensitized PCB.
Anyone know where you can buy this?  In Canada preferably.

Thanks in Advance,

Aaron

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2002\12\14@130502 by Tal Bejerano - AMC

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my advice is don't use it
it's too messy.
I have a photosensitive spray from a German company called "KONTAKT CHEMIE"
it's called POSITIV 20
I try to work with it with a little luck.
buying the ready made is better

Regards

Tal Bejerano
AMC - ISRAEL


{Original Message removed}

2002\12\14@132143 by Rick C.

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I have used a chemical called KPR (Kodak Photo Resist). I don't know if
they make it anymore. I bought a quart of it about 30 years ago and have
sensitized over a thousand boards with it and I still have half a bottle
of it. Google shows about 50 hits on it. Apparently it is toxic, but so
is everything.
I'm getting ready to release a new web page this evening showing how to
make excellent circuit boards.
I have not seen any spray on resist that actually works.
Rick

"A.J. Tufgar" wrote:

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2002\12\14@144632 by Mike Harrison

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Don't waste your time with this stuff - it's almost impossible to get
a consistent coating thickness and keep the dust off.

On Sat, 14 Dec 2002 12:36:32 -0500, you wrote:

>A friend was telling me about a chemical he painted on copper clad to
>make photosensitive PCB's, rather then buying the presensitized PCB.
> Anyone know where you can buy this?  In Canada preferably.
>
>Thanks in Advance,
>
>Aaron

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2002\12\14@172138 by Josh Koffman

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Next time you head into Toronto, head to Supremetronics on Queen Street
West. They have spray cans of the stuff. Not too expensive, but you may
be getting what you pay for.

Josh
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"A.J. Tufgar" wrote:
> A friend was telling me about a chemical he painted on copper clad to
> make photosensitive PCB's, rather then buying the presensitized PCB.
>  Anyone know where you can buy this?  In Canada preferably.

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2002\12\14@174700 by Peter L. Peres

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On Sat, 14 Dec 2002, Tal Bejerano - AMC wrote:

*>my advice is don't use it
*>it's too messy.
*>I have a photosensitive spray from a German company called "KONTAKT CHEMIE"
*>it's called POSITIV 20
*>I try to work with it with a little luck.

I have used both and P20 is very good once you follow the instructions
EXACTLY (wrt baking and developer and cleaning and dust) and experiment a
little. Two layers on preheated board (60 degrees C) at 5 minutes between
them and following oven bake for 30 minutes at 75C in the dark make
perfect boards every time ... DO NOT BREATHE THE FUMES - USE A BIG FAN TO
MOVE AIR AWAY FROM THE WORK AREA.

Imho the precoated boards sold here are of inferior quality and they
cannot b cut to shape without resist flaking off.

Peter

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2002\12\14@174712 by Peter L. Peres

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You are looking for photoresist. Comes in two kinds: liquid or spray-on.
Make sure you find out the process requirements BEFORE you buy, some of
them require rather special processing, are poisonous, smell bad, and in
general dangerous. One that is much used by amateurs is Photopositiv 20
from Contact Chemie in Europe (but available everywhere afaik - even
here). There are other options, like Kepro, 3M and many others.

Peter

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2002\12\14@213559 by Russell McMahon

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> You are looking for photoresist. Comes in two kinds: liquid or spray-on.

Applying your own photoresist is similar to using laser printers to make
your own PCBs - the results are very dependant on method, knack and
attention to details and being a competent craftsman can help a lot. If you
are prepared to work at it you can get good results. If you do it half
heartedly you can expect variable and unacceptable results.

       RM

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2002\12\15@020040 by Alan Shinn

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Wow,
I was recently looking at my ancient bottle of KPR and was wondering if
it still works. Do you use the developer that was sold to work with it
or have you found a substitute?
I used it long ago to photoetch brass jewelry. I used one of thos little
spray thingies with it. Then there was some nasty seeming developer
stuff (some sort of chlorinated hydrocarbon) which I no longer have.
Then there was a nice dye to put on after developing (dissolving off the
unexposed resist) to be able to see the remaining resist to "proof read
it". The system worked very well for me but it did take a bit of doing
to learn how.



Date:    Sat, 14 Dec 2002 13:22:01 -0500
From:    "Rick C." <spam_OUTrixyTakeThisOuTspamVVALLEY.COM>
Subject: Re: [EE]:  Photosensitive chemical.

I have used a chemical called KPR (Kodak Photo Resist). I don't know if
they make it anymore. I bought a quart of it about 30 years ago and have
sensitized over a thousand boards with it and I still have half a bottle
of it. Google shows about 50 hits on it. Apparently it is toxic, but so
is everything.
I'm getting ready to release a new web page this evening showing how to
make excellent circuit boards.
I have not seen any spray on resist that actually works.
Rick
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Make your own replica
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2002\12\15@090611 by Rick C.

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KPR should last your lifetime as long as it is kept in the tightly sealed
brown glass bottle it came in. The stuff should smell something like
fingernail polish. The early developers were/are nasty chemicals.
Carcinogens and the like. I used to use trichlorethelyene 1.1.1 and it
worked great! YOu just could not breathe any vapors. Illegal to purchase
now. I used it in 5 gallon drums to clean hydraulic oil from the floors of
nuclear missile sites underground. Not very much ventilation. We'd come out
after a day of breathing tons of that stuff as high as a kite. Little did we
know our kidneys and liver were being damaged.

Xylene is currently available to use on circuit boards. Go to my new web
page and I explain the whole thing. http://www.pic101.com/pcb

My boards are so consistent I never had to use a dye.

Rick

Alan Shinn wrote:

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