[Jewelry making - Article 01095] - [Orchid] Metal hardness

[James Binnion]

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Was: Forming 24K Gold

    This information is from Mark Grimwade's Introduction to Precious
    Metals. A wonderful book that is unfortunately out of print but can
    be occasionally found on the used book sellers lists. 

    Pure Metals
        Gold: Annealed 20 HV, Hard 58 HV
        Silver: Annealed 22 HV, Hard 100 HV
        Platinum: Annealed 37 HV, Hard 108 HV
        Palladium: Annealed 37 HV, Hard 106 HV

    Alloys
        Sterling Silver: Annealed 56 HV, Hard 140-180 HV
        18K Yellow (12.5% Ag - 12.5% Cu): Annealed 150 HV, Hard 225 HV
        18K Ni White (14% Ni - 11% (Cu+Zn)): Annealed 220 HV, Hard 350 HV
        14K Yellow (20.5% Ag - 21% Cu): Annealed 190 HV, Hard 260 HV
        14K Ni White (14.5% Ni - 20% Cu - 7% Zn): Annealed 152 HV

    With gold alloys there are tens if not hundreds of variations so the
    above info is just a representative sample. Your supplier should be
    able to provide you with this info and if they can't then ask them to
    get it for you. This is the only way we can convince suppliers that
    we need more information on the metals they supply.

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