[Jewelry making - Article 00941] - Re: [Orchid] Casting small round bars

[RING14K]

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    It would seem that perhaps your problem stems from the mold
    procedure. If you do not heat your mold and maintain a gradual heat
    release the metal will have a small loose crystalline structure, if
    you give the metal at least 5 mins of holding heat at around 800
    degrees it will  make the crystal growth  larger and more uniform as
    it has a chance to pull itself together instead of being shocked
    into freeze. This shock results in micro fractures that will not
    roll together and create space for contaminant gasses to reform
    making weakness..Over heating the metal can also cause serious
    problems, the best marker for correct temperature is 'when the red
    streaks dance' when you remove the heat source, if this is not
    easily achieved then you are not using enough flux which will also
    cause problems in the pour.. hope this helps... Ringman john Henry


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