[Jewelry making - Article 00707] - Re: [Orchid] Article: Minimal Metalsmithing

[James Binnion]

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>     Tensile Strength:
>     PMC Standard: 63 MPa
>     PMC+: 116 MPa
>     PMC3: 135 MPa
>     Fine Silver: 157 MPa
>     Sterling Silver: 311 MPa
>     I assume the fine and sterling silver values are for cast rather
>     than rolled metal. These numbers refer to fully sintered PMC fired
>     for the maximum time and temperature.

    Actually the numbers for fine and sterling silver are for their
    fully annealed state. Cast sterling is slightly higher than the
    quoted number and I can not find one for cast fine silver. Also it is
    good to remember that these numbers are not absolutes but rather a
    range of values from tests that are often averaged to give the quoted
    number. They can and do vary slightly from test to test. A tensile
    test involves a machine that pulls on a sample till it gives and
    then eventually breaks the number quoted is the maximum strength
    before failure. MPa stands for Mega-Pascals. MPA x 145.0377= PSI so
    311 MPa = 45106 PSI often written as 45 KSI. 

    So PMC3 is 85% as strong as annealed fine silver and PMC standard is
    40% as strong as annealed fine silver. Another measurement derived
    from the tensile testing, the elongation percentage which tells how
    much the material stretches during testing would let us compare
    ductility and in effect how "brittle " PMC is with respect to fine
    silver. If anyone has these numbers I would love to see them. 

Jim

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

 
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