[Jewelry making - Article 00567] - Re: [Orchid] Investment cracking.

[Dr. Walter Bowser]

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    One of the biggest problems with investment cracking is not letting
    the wet investment vent the steam before it forms.  The slow rise in
    temperature is important and then holding it at plateaus until it is
    well dried and burned out. 

    The use of Borax in the mix is new to me.  I have not tried it but it
    sounds good.  How much do you use.  I usually add a small amount of
    debubblizer to the mix.  It helps the air to remove itself from the
    mixture.  I also paint my wax with it and then with a strainer or
    piece of nylon stocking put over a hoop, I slowly sprinkle dry
    investment powder on the wet surface.  It adheres very tightly and
    gives me an exceedingly smooth surface and reduces the amount of fire
    scale I get. 

    Have fun and keep up the good info. It is really great to have such
    an interesting network out there. 

Walt

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