[Jewelry making - Article 00111] - Re: [Orchid] Asbestos sheets

[JoJu428]

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>      I am a lurking dentist. In dentistry we line our flasks prior to
>     investing with strips of thickish asbestos prior to investing 

    Hi Mary nice to meet a fellow dentist who is also involved in
    metalsmithing. I used to correspond with Skip Meister who has
    recently passed away but who left his mark on this wonderful forum.
    He was a very well informed dental technician but was also involved
    with jewelry and frequently contributed most useful information to
    Orchid. 

    As to asbestos: we would line the inside of casting flasks to permit
    the expansion of the investment during burnout so as to partially
    compensate for the shrinkage of the gold which took place when gold
    went from the liquidus state to solid state. It (lining) also made
    for easier cleanout of the casting rings (flasks). This procedure
    was modified in the late '70's when we all became aware of the
    potential danger of asbestos inhalation and a substitute liner was
    supplied with the purchase of investment material. The asbestos
    strips were used by some to line the crucible in the casting
    machine, but this is easily accomplished with a layer of casting
    flux melted onto the surface of the crucible.  Joe Dule

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