Can Ammoinium Persulfate be poured down the drain?
Ted
nedtron@... wrote:
> Greetings,
>
> Save the ferric chloride in a plastic container with a good seal for
> future
> circuit boards and / or etching projects.
>
> The ferric chloride can be used over and over again many times until
> it
> becomes highly saturated with copper.
>
> Do not discard the ferric chloride in a drain as this is illegal in
> most areas.
>
> The smallest sized crock pots or slow cookers make a suitable etcher
> for
> the standard 16 ounce bottles of ferric chloride available from Radio
> Shack, Jameco, etc.
>
> The ferric chloride should be heated between 50°C (122°F) and 65°
> (149°F)
> or the etching time and the undercutting of traces will be excessive.
>
> Do not heat the ferric chloride in a microwave oven, in a gas oven nor
> with
> open flame.
>
> The ferric chloride should only be used in a well ventilated area.
>
> Ferric chloride is also useful for etching copper and brass thin sheet
>
> metal parts.
>
> Railroad model hobbyist etch out very detailed and intricate railroad
> car
> shells from thin sheets of brass. After etching, the brass sheets are
> folded up and brazed to create the body of the model railroad cars.
> The
> detail down to the individual rivets is amazing.
>
> We have used ferric chloride to etch out precision shim washers that
> were
> 1mm in thickness for the laser optics industry. We resorted to ferric
> chloride etching when die punch efforts failed.
>
> Temperature controlled ferric chloride provides reliable, repeatable
> results with less toxicity than the alternatives. Ammonium persulfate
> is a
> suitable and reasonable alternative to ferric chloride.
>
> Thanks, Ned
>
>
>
>
>
> Ned Seith
> Nedtronics
> 1716 lodi Avenue
> San Mateo, CA 94401
> 650-473-0200 x111
> FAX 650-473-0357
> nedtron@...
>
> I'm new at this and I want to do my first pcb. I have a cad software,
> copper board, ferric chloride, drills, ect, ect. By doing a lot of
> reading I think I have a god idea on how to do it. However, of all
> the webpages and articles I found on how to make a pcb non of them
> talk about what to do with the left over feric chloride. I don't
> think my sewage piping would like me dumping the stuff down the
> toilet and neither would the enviromentalist. So, my question is,
> what am I suposed to do with the feric chloride once I make my first
> pcb? Do I have to take it to a collectionn falicility? Is there a way
> to neutralise it so I can dump it in the drain and is so, is this
> legal or good to do?
>
>
>
>
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--
Ted Huntington
Programmer Analyst I
Main Library
University of California, Irvine
PO Box 19557
Irvine, CA 92623-9557
emesgs:
thunting@...web page:
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