[Jewelry making - Article 00116] - Re: [Orchid] Curing investment under pressure for casting

[Jason Borgstahl]

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Hi John,

    Let me put this one to bed. If you are not mixing under vacuum the
    pressure pot will absolutely make certain dental investments
    significantly more dense by greatly reducing the size of air bubbles
    in the slurry- less air, more investment in a given volume. We used
    to use one ourselves until we bought the more expensive vacuum
    mixers. For gypsum investments there is not a big advantage. 

    If you need stronger investment there are three basic thing you can
    do: 1. lower your water to powder ratio 2. Use warmer water 3. Allow
    the investment cure for several hours prior to burnout to increase
    green strength. Mike Stover at Ransom and Randolph has a wealth of
    knowledge in this area. 

    You probably don' know this about me, but I am a cosmology nut.
    Cosmologists now know that black holes are integral to galaxy
    formation. Not only is there a black hole at the center of every
    galaxy, but there is a predictable relationship between the size of
    the galaxy and its black hole and the speed of the stars on the
    outer edge of the system that are now too far away to be affected by
    the gravity of the singularity at the center. 

    I hope all is well with you. 

Jason
Casting House
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