[Jewelry making - Article 00035] - Re: [Orchid] Charcoal casting flux

[Skip Meister]

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    The flux comes in a cylindrical 'can' about 4 1/2" tall  x 1 3/4"
    dia.  I have had mine for 12 years (about 5000 casting melts)  and
    there is about 1/3 of a 'can' left, so I don't use very much (three
    quick shakes per oz. of metal).  This flux also has borax in it.  The
    residue from the 'cleansing' ends up as a 'glass' on the bottom of
    the button.  Pickle removes it.  I can't remember the particulars of
    what the Ney metalurgist told me a zillion years ago, but I can even
    use this casting flux on my high heat gold alloys which are used for
    dental ceramic application.  *ANY* contamination, even finger (body)
    oils, is a delayed 'death sentence' which interferes with the
    ceramics chemically bonding to the metallic oxide layer.  This
    usually appears as a large 'air' bubble on the final glaze bake, as a
    'crater' through the porcelain down to bare metal, OR is one of the
    problems that causes the ceramics to shear cleanly off down to the
    metal substructure after the crown is cemented into the mouth. 

Regards,

Skip

-------------------------------------
Skip Meister
hansgraf AT xnet.com
Orchid Jewelry Listserve Member
A day without sunshine is like night!
N.R.A. Endowment  
"No man's life, liberty or fortune is safe...while our legislature is in session." 
Benjamin Franklin


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