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

----- Original Message -----
From: "Stefan Trethan" <stefan_trethan@...>
To: <Homebrew_PCBs@yahoogroups.com>
Sent: Friday, January 06, 2006 12:40 AM
Subject: Re: [Homebrew_PCBs] Re: CUCL Temperature , etch time ?????


> On Thu, 05 Jan 2006 23:33:14 +0100, Bruno St-Laurent <bsl88k@...>
> wrote:
>
>>
>>
>> Stefan about the H2O2 30% , you really mean 30% not volume 30 ????
>>
>>
>> cause today i found H2O2 volume 30, it's only 9%!!!!!
>>
>>
>> Bruno
>>
>
>
> i dunno for sure, but i think it is 30% by volume not weight.

I think 30 vols means that it produces 30 x its volume as oxygen gas.

Leon