[Jewelry making - Article 00405] - Re: [Orchid] Best Bronze for jewelry making?

[James Binnion]

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Hi Judy,

>     try Googling "phosphor bronze" and "commercial bronze." Lots of
>     data there, including comments on workability. "Commercial bronze"
>     seems to be a leaded brass. 

    C22000 otherwise known as Commercial Bronze is a member of the
    Yellow Brass series C2XXXX alloys and is a copper/zinc alloy not a
    leaded brass alloy. It may potentially contain as much as.05% lead
    and/or. 05% iron and still be called Commercial Bronze but its
    nominal composition is 90% copper and 10% zinc. Lead and iron are
    present as impurities rather than alloy components. The C3XXXX series
    alloys are the Leaded Brasses and have lead added to improve
    machinability. In Leaded Brass alloys the lead is present at
    concentrations of 0.25% - 3.50% depending on the alloy. 

    If you go to the Copper Development Association website
    http://copper.org you can look up all the standard information and
    chemical compositions of most copper alloys along with a lot of other
    useful information. 

    If you go here you can look up the alloys by name and get basic
    composition data. 

    http://tinyurl.com/33s2ca 

    If you go here you can get detailed data on any of the alloys but
    you must know the Alloy Number which you get from the search listed
    above. 

    http://tinyurl.com/2ofjyt 

James Binnion
jbin AT mokume-gane.com
James Binnion Metal Arts
http://www.mokume-gane.com
360-756-6550
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