On Mon, 31 May 2010 15:27:10 -0400, you wrote:
>
>Harvey:
>
>I am merely a "lurker" on the group, slowly ramping up
>to do some etching.
>
>When you say "muriatic acid" what percentage (i.e.,
>strength)
>is it? Where do you buy it?
30% I think. It's the standard stuff you buy at the home big box
stores.
>
>And the H2O2 is simply the 4% stuff you get at the corner
>drugstore?
>
Yes.
Mixed 4 parts H2O2 to one part acid. Does a wonderfully fast job of
etching for the first week, good for the second, slow for the third,
and lousy for the fourth.
May be regenerated by adding H2O2, however, will eventually change
into Cuprous Chloride etchant.
Do this by encouraging it and bubbling air through it when etching.
That regenerates the oxygen. When it turns a green color, it's
probably about right (there's an excellent link on it that I don't
have at the moment). From then on, needs to have air bubbled through
it, but never deteriorates, could possibly use plating out the copper,
but I'm not really sure on that.
Not there on the etchant quite yet, but will be soon.
Easier to get than Ferric Chloride.
Harvey
>- Jim Tonne W4ENE
>
>
>
>
>----- Original Message -----
>From: "Harvey White" <madyn@...>
>To: <Homebrew_PCBs@yahoogroups.com>
>Sent: Monday, May 31, 2010 2:53 PM
>Subject: Re: [Homebrew_PCBs] Etching container
>
>
>> On Mon, 31 May 2010 10:50:57 -0700, you wrote:
>>
>>>Hi, I have yet to find a suitable container for the
>>>etchant (I use the
>>>muriatic acid thing).
>>
>> I also use muriatic acid and H2O2.
>>
>> I use a sealable food container, suitably sized for the
>> board.
>>
>> Works well for me.
>>
>> I would take the small container and put it in another
>> larger, sealed
>> container to prevent spills.
>>
>> Harvey
>>
>>>
>>>It is true I can use any sort of plastic container: I even
>>>have one of
>>>those kits, with acquarium pump and bubbler and heater,
>>>but the main
>>>problem is that it is basically impossible to store
>>>safely, as it cannot
>>>be properly sealed. Pouring back to another, safer
>>>container can be
>>>still be problematic because of spills and such, and then
>>>I always have
>>>to wash everything, that takes time to do properly. Also,
>>>as I never do
>>>boards bigger than the standard 10x16 cm, I feel like a
>>>smaller
>>>container with "not so much" etchant would be so much
>>>better for my needs.
>>>
>>>Any advice?
>>>
>>>I have reached a point in my PCB making that I can do very
>>>fine boards,
>>>no problem, but I waste a lot of time in taking care of
>>>details, and I
>>>want to make the whole thing more streamlined.
>>>
>>>bye
>>>as
>>>
>>>
>>>
>>>------------------------------------
>>>
>>>Be sure to visit the group home and check for new Links,
>>>Files, and Photos:
>>>http://groups.yahoo.com/group/Homebrew_PCBsYahoo! Groups
>>>Links
>>>
>>>
>>>
>>
>>
>> ------------------------------------
>>
>> Be sure to visit the group home and check for new Links,
>> Files, and Photos:
>> http://groups.yahoo.com/group/Homebrew_PCBsYahoo! Groups
>> Links
>>
>>
>>
>
>
>
>------------------------------------
>
>Be sure to visit the group home and check for new Links, Files, and Photos:
>http://groups.yahoo.com/group/Homebrew_PCBsYahoo! Groups Links
>
>
>