[Jewelry making - Article 00102] - Re: [Orchid] Firescale Prevention During Vacuum Casting

[The Doctor]

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    I know this question was for Lee, but in case he's busy, I'd like to
    chime in before something bad happens to Mr. Mansilla 

>         The main reason for our cast to get oxidized is the contact
>     with oxygen in the air, right? What happens if I use the Vacuum Bell
>     on my casting machine to keep my casted flask from the air in the
>     first minutes of the casting? 

    There is still air (and oxygen) in the bell vacuum, so no, there
    wouldn't be an advantage. 

>         I think it may work, but what concerns me is that the
>     plexiglass of the Vacuum Bell could melt by the heat of my just
>     casted flask. 

    Worse, the bell may implode or explode, sending shards of hot,
    melted plastic everywhere. Also, as the pump tries to create the
    vacuum, the heated air will be trying to expand at the same time.
    I'm not sure exactly what would happen, but this is one of the most
    dangerous ideas I've ever heard. Please don't try it!!! 

James in SoFl

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