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OT: concentration of ferric chloride — Parallax Forums

OT: concentration of ferric chloride

ArchiverArchiver Posts: 46,084
edited 2000-04-12 19:24 in General Discussion
I can get some ferric chloride for free, in powdered form. I don't suppose
anyone out there knows the concentration or molarity of the ferric chloride
etching solution? If I could find that out it would be a simple matter of
few chemistry equations to figure out how much I needed. Can someone please
help me?

Whats the other chemical thats used in etching? whats it's concentration?
Or is it in a liquid state at room tempature?
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Comments

  • ArchiverArchiver Posts: 46,084
    edited 2000-04-12 01:48
    Hi Ed,

    I started by using ferric chloride for etching, and the experience was bad.
    From what I saw, it's quite temperature-dependant, you have to keep it at
    around 40 degrees celsius for it to be effective.
    A friend of mine told me another way, and now I get beautiful boards:

    - Once the board is insolated and developed, place it on a plastic tray
    - Pour hydrochloric acid at 25% conc., which you should be able to get easy
    (at least here in Spain I can get 3-litre bottles for around $2), until it
    covers the board.
    - With a syringe, pour drop by drop some strong (30% by volume) hydrogen
    peroxide (H2O2). You will see the exposed copper dissolve.
    - Carefully, don't let bubbles form, if you see some appearing, just pour a
    little water to stop them, keep going until all unwanted copper has
    dissolved.
    - Take the board, rinse it very well, and polish with some nail-varnish
    remover to get the final copper finish.

    It works great for me!

    Cheers,

    Mike

    >
    Mensaje original
    > De: ED Ward [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=k2fcMTxkTarVcASJeYozHhBt-5VFX65b-9KSkfZF6QLiYf4PsM81RSWYt6yNH4W7zDzVs-vnXmTp5LfOHvXX]punk__rocker@h...[/url
    > Enviado el: mi
  • ArchiverArchiver Posts: 46,084
    edited 2000-04-12 01:58
    Please be careful. If I'm not mistaken, the process you outline will release
    Chlorine gas so you should be under a vent hood or at least in a very
    well-ventilated area. This is always a good idea anyway.

    Regards,

    Al Williams
    AWC
    * Tax special from now to April 17th. Order a copy of Microcontroller
    Projects with Basic Stamps and get an ASP-II free.
    http://www.al-williams.com/awce/sbook.htm
  • ArchiverArchiver Posts: 46,084
    edited 2000-04-12 02:20
    Hi Al,

    I am really careful with that now. I forgot to mention it, but it's true
    that you release Chlorine gas, and it's not nice. Good ventilation is
    essential.

    Thanks for the remark, all the best,

    Mike

    >
    Mensaje original
    > De: Al Williams [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=f6g56OcT32LEpmk6P9PoRW9gVkxP2rEi5meQLig-mBwmdae8qY8pvu2-_obDcWRCh0PNtOdokQw4cA]alw@a...[/url
    > Enviado el: mi
  • ArchiverArchiver Posts: 46,084
    edited 2000-04-12 03:04
    Here is the original text:
    > - Pour hydrochloric acid at 25% conc., which you should be able
    > to get easy
    > (at least here in Spain I can get 3-litre bottles for around $2), until it
    > covers the board.

    That is HCL (hydrochloric) not H2SO4 which is in fact Sulpheric.

    Maybe we aren't talking about the same message. Anyway, let's just leave it
    at: Be Careful Everyone.



    Regards,

    Al Williams
    AWC
    * Tax special from now to April 17th. Order a copy of Microcontroller
    Projects with Basic Stamps and get an ASP-II free.
    http://www.al-williams.com/awce/sbook.htm
  • ArchiverArchiver Posts: 46,084
    edited 2000-04-12 04:36
    This is all very fascinating, but no one has answered the actual question I
    put forth. What is the concentration of ferric chloride? It's probably
    labeled right on the bottle.

    I found out what the other stuff is, ammonium persulfate. The HCL idea
    sounds interesting, assuming I can find HCL for that price here.


    >From: "Al Williams" <alw@a...>
    >Reply-To: basicstamps@egroups.com
    >To: <basicstamps@egroups.com>
    >Subject: RE: [noparse][[/noparse]basicstamps] OT: concentration of ferric chloride
    >Date: Tue, 11 Apr 2000 21:04:25 -0500
    >
    >Here is the original text:
    > > - Pour hydrochloric acid at 25% conc., which you should be able
    > > to get easy
    > > (at least here in Spain I can get 3-litre bottles for around $2), until
    >it
    > > covers the board.
    >
    >That is HCL (hydrochloric) not H2SO4 which is in fact Sulpheric.
    >
    >Maybe we aren't talking about the same message. Anyway, let's just leave it
    >at: Be Careful Everyone.
    >
    >
    >
    >Regards,
    >
    >Al Williams
    >AWC
    >* Tax special from now to April 17th. Order a copy of Microcontroller
    >Projects with Basic Stamps and get an ASP-II free.
    >http://www.al-williams.com/awce/sbook.htm
    >
    >
    >
    >

    ______________________________________________________
    Get Your Private, Free Email at http://www.hotmail.com
  • ArchiverArchiver Posts: 46,084
    edited 2000-04-12 06:32
    Ed:
    My Radio Shack bottle is labeled 31.47% FeCL3 & 68.53% H2O. Don't know how
    this translates into your powder, but good luck.

    Ray McArthur
    Original Message
    From: ED Ward <punk__rocker@h...>
    To: <basicstamps@egroups.com>
    Sent: Tuesday, April 11, 2000 11:36 PM
    Subject: RE: [noparse][[/noparse]basicstamps] OT: concentration of ferric chloride


    > This is all very fascinating, but no one has answered the actual question
    I
    > put forth. What is the concentration of ferric chloride? It's probably
    > labeled right on the bottle.
    >
    > I found out what the other stuff is, ammonium persulfate. The HCL idea
    > sounds interesting, assuming I can find HCL for that price here.
    >
    >
    > >From: "Al Williams" <alw@a...>
    > >Reply-To: basicstamps@egroups.com
    > >To: <basicstamps@egroups.com>
    > >Subject: RE: [noparse][[/noparse]basicstamps] OT: concentration of ferric chloride
    > >Date: Tue, 11 Apr 2000 21:04:25 -0500
    > >
    > >Here is the original text:
    > > > - Pour hydrochloric acid at 25% conc., which you should be able
    > > > to get easy
    > > > (at least here in Spain I can get 3-litre bottles for around $2),
    until
    > >it
    > > > covers the board.
    > >
    > >That is HCL (hydrochloric) not H2SO4 which is in fact Sulpheric.
    > >
    > >Maybe we aren't talking about the same message. Anyway, let's just leave
    it
    > >at: Be Careful Everyone.
    > >
    > >
    > >
    > >Regards,
    > >
    > >Al Williams
    > >AWC
    > >* Tax special from now to April 17th. Order a copy of Microcontroller
    > >Projects with Basic Stamps and get an ASP-II free.
    > >http://www.al-williams.com/awce/sbook.htm
    > >
    > >
    > >
    > >
    >
    > ______________________________________________________
    > Get Your Private, Free Email at http://www.hotmail.com
    >
    >
    >
    >
  • ArchiverArchiver Posts: 46,084
    edited 2000-04-12 19:24
    this means that in 100 grams of solution there is 31.47 grams of FECL3

    Thanks, for your help...

    >From: "rjmca" <rjmca@w...>
    >Reply-To: basicstamps@egroups.com
    >To: <basicstamps@egroups.com>
    >Subject: Re: [noparse][[/noparse]basicstamps] OT: concentration of ferric chloride
    >Date: Wed, 12 Apr 2000 01:32:59 -0400
    >
    >Ed:
    >My Radio Shack bottle is labeled 31.47% FeCL3 & 68.53% H2O. Don't know how
    >this translates into your powder, but good luck.
    >
    >Ray McArthur
    >
    >
    Original Message
    >From: ED Ward <punk__rocker@h...>
    >To: <basicstamps@egroups.com>
    >Sent: Tuesday, April 11, 2000 11:36 PM
    >Subject: RE: [noparse][[/noparse]basicstamps] OT: concentration of ferric chloride
    >
    >
    > > This is all very fascinating, but no one has answered the actual
    >question
    >I
    > > put forth. What is the concentration of ferric chloride? It's probably
    > > labeled right on the bottle.
    > >
    > > I found out what the other stuff is, ammonium persulfate. The HCL idea
    > > sounds interesting, assuming I can find HCL for that price here.
    > >
    > >
    > > >From: "Al Williams" <alw@a...>
    > > >Reply-To: basicstamps@egroups.com
    > > >To: <basicstamps@egroups.com>
    > > >Subject: RE: [noparse][[/noparse]basicstamps] OT: concentration of ferric chloride
    > > >Date: Tue, 11 Apr 2000 21:04:25 -0500
    > > >
    > > >Here is the original text:
    > > > > - Pour hydrochloric acid at 25% conc., which you should be able
    > > > > to get easy
    > > > > (at least here in Spain I can get 3-litre bottles for around $2),
    >until
    > > >it
    > > > > covers the board.
    > > >
    > > >That is HCL (hydrochloric) not H2SO4 which is in fact Sulpheric.
    > > >
    > > >Maybe we aren't talking about the same message. Anyway, let's just
    >leave
    >it
    > > >at: Be Careful Everyone.
    > > >
    > > >
    > > >
    > > >Regards,
    > > >
    > > >Al Williams
    > > >AWC
    > > >* Tax special from now to April 17th. Order a copy of Microcontroller
    > > >Projects with Basic Stamps and get an ASP-II free.
    > > >http://www.al-williams.com/awce/sbook.htm
    > > >
    > > >
    > > >
    > > >
    > >
    > > ______________________________________________________
    > > Get Your Private, Free Email at http://www.hotmail.com
    > >
    > >
    > >
    > >
    >
    >
    >
    >

    ______________________________________________________
    Get Your Private, Free Email at http://www.hotmail.com
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