[Jewelry making - Article 01223] - Re: [Orchid] Enameling on Argentium?

[David Popham]

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Bill,

    Just an idea. Could the spalling be the result of incompatabilities
    of expansion coefficients between the glass and the metal?
    Unfortunately my copy of the CRC Handbook does not list the
    expansion coefficient of germamium. 

    One idea I would like to propose is that you make a test strip using
    Thompson enamels #1020 and #1045. The expansion coefficients are
    respectively 260 and 341 cm/cm/degC x 10e7 and are at the extreme
    limits. #1465 has an expansion coefficient with a value of 300
    cm/cm/degC x 10e7 and is halfway between the two extremes. 

    David 

    in sunny and dry Victoria, a perfect February for we humans but not
    the trees 


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