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Question regarding concentration of chemicals

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  • 28-02-2012 9:59pm
    #1
    platinum95
    Registered Users Posts: 31 ✭


    Hi,
    I'm going to start etching my own PCBs at home, using the HCL and H2o2 etchant from this instructable - http://www.instructables.com/id/Stop-using-Ferric-Chloride-etchant!--A-better-etc/

    In this tutorial, he uses 2 parts 3% Hydrogen peroxide to 1 part 36% Hydrochloric acid.

    I bought Hydrogen peroxide today, but it is 6% instead of 3%.
    What can I do to make it the same as the 3%? Can I just use half as much, or do I add water in a 1:1 ratio with the h2o2?
    Or is it something completely different?

    Thanks


Comments

  • Options
    #2
    krd
    Banned (with Prison Access) Posts: 3,455 ✭✭✭krd


    Just dilute it.

    There's not that much need for precision in etching.


  • Options
    #3
    SOL
    Registered Users Posts: 1,155 ✭✭✭SOL


    If it is 6 in every 100 parts H2O2 and you want it to be 3 in 100, then add in 100 parts
    (an equal volume) water and it'll be 6 in 200 which is the same as 3%


    So yeah, as you are right to add 1:1 6% H202 and water instead of 3% H202


  • Options
    #4
    platinum95
    Registered Users Posts: 31 ✭platinum95


    What is the other 94% composed of? Is it just water?


  • Options
    #5
    SOL
    Registered Users Posts: 1,155 ✭✭✭SOL


    exactly


  • Options
    #6
    platinum95
    Registered Users Posts: 31 ✭platinum95


    Great, thanks for the info everyone


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