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.
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