[Jewelry making - Article 00019] - Re: [Orchid] Casting investment inclusions & causes

[JAGMAN425]

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    Hi Joe Lovato, I would suggest that you read exactly what I said and
    you will notice that my statement had to do with a "pinhole visible
    in the cast product and after opening up this pin hole, there was
    investment inside" This is without doubt  , caused by an airpocket in
    the wax. It is also a fact that other things may cause a similar effect
    and all of that was mentioned in previous emails about the subject. 

    I personally have never seen investment break off in a casting unless
    the wax had left over, undried wax wash or incorrectly mixed
    investment. In rare cases, sprueing can have this effect and has to
    do with correct flow patterns from the spue through the piece. 

    Other than that...what can be said is that there are extremely
    complex parts that are cast that have sharp edges,thin sections,thick
    sections ,holes,strange flow patterns all in the same piece ... and
    we don't get breakage or inclusions... in these parts ... done in
    quantities of 1000 pcs at a time.... The few times we have had a
    problem were directly related to an accidental bad mix in investing 
    or the wax wash was not dry in every area of the piece. 

    We do inspect our waxes with a magnifier to eliminate air pockets in
    the wax. 

    Daniel Grandi  

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