[Jewelry making - Article 00157] - [Orchid] Flask temperature

[Stan Burris]

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    This is my first day as a member of the Orchid discussion group, and
    I do not find a recent thread devoted to flask temperature (although
    many were in past years). 

    I am getting ready to buy a home casting system, and I want to make
    sure my decision is an informed one. (I mm presently using the
    centrifugal system in the studio of my jewellry instructor.) 

    I have read a good number of the postings on flask temperature, but
    still the picture is not perfectly clear. Why is it that I have been
    able to cast a perfectly dense 3cm by 3cm by 3mm slab of silver with
    raised initials (2 to 3 mm high) using a cuttlefish bone at ROOM
    temperature, yet if I want to use a flask it should be seven or
    eight hundred degrees Fahrenheit?? (None of the books I have
    purchased address this topic.) There must be a simple answer, but I
    cannot think of it. 

    By the way, the cuttlefish bone casting gave such a solid casting
    that I do not believe that using a centrifugal cast could possibly
    make it any more solid. This leads me to suspect that a vacuum
    system should be just fine as far as density goes. 

    Stan Burris  

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