Archive of the former Yahoo!Groups mailing list: Homebrew PCBs

Leon Heller, G1HSM
leon.heller@...
http://www.geocities.com/leon_heller

----- Original Message -----
From: "YD" <yd_br@...>
To: <Homebrew_PCBs@yahoogroups.com>
Sent: Monday, May 08, 2006 11:44 AM
Subject: Re: [Homebrew_PCBs] Re: Ferric Chloride - muck at bottom of tank
question


>
>
> --- fenrir_co <fenrir@...> wrote:
>
>> --- In Homebrew_PCBs@yahoogroups.com, William Carr
>> <Jkirk3279@...>
>> wrote:
>> >
>> >
>> > On May 7, 2006, at 12:07 PM, fenrir_co wrote:
>> >
>> > > You can get 40 volume H2O2 (peroxide, hair
>> bleach) at Sally Beauty
>> > > Supply without needing a license or whatnot to
>> purchase it.
>> >
>> >
>>
>> 'Volume' doesn't mean percent. I'm not sure of the
>> exact conversion,
>> but I believe the strength is only about 15/20%.
>> They have 60 volume
>> as well, but only in cream, not in pure liquid.
>>
>
> A bottle I looked at said 20 vol/6% on the label, so
> it looks like the scale factor is 0.3% per volume. So
> 40 volumes would be 12%. I saw somewhere what this
> volume business is all about but I can't quite recall
> it now. I think it had to do with the weight of the
> solution.

It's the amount of oxygen it can release - 20 vol means it can produce 20
times its volume of O2. One ml of H2O2 will produce 20 ml of O2.

Leon

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