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Etching PCB with HCL and H202

Discussion in 'PCB Layout, Design and Manufacture' started by vick5821, Jul 24, 2013.

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  1. vick5821

    vick5821

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    Jan 22, 2012
  2. gorgon

    gorgon

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    Jun 6, 2011
    When I did this some 40 years ago, I used both HCl and H2O2 at 30% strength. 1 part of each and 3-4 parts water as far as I can remember. Always remember to pour the acid into water, NOT the other way around.
     
  3. vick5821

    vick5821

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    Jan 22, 2012
    Pour the acid into the beaker(with water) , then pour H202 you means ? 30% concentation means how many molar ?

    Thanks
     
  4. gorgon

    gorgon

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    Jun 6, 2011
    Correct, always water first. 30% HCl is around 11.2 M. H2O2 I've never used M, only %(volume).
     
  5. vick5821

    vick5821

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    Jan 22, 2012
    If like I go to hardware shop and ask them for HCl, they will give me only one type ..they didnt sell in molar I think. So any will do is it ?

    Thank you
     
  6. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    Jan 21, 2010
    If you purchase HCl in a form where it is listed with a w/w or % conc then you'll have to do some math to get the molar concentration. Just googling for it will also probably get you the answer.

    As Gorgon has suggested 30% is about 11.2M
     
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