[Jewelry making - Article 00172] - Re: [Orchid] Vacuum casting seal problem

[James Binnion]

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>     I have been told by lifelong jewelers and casters that the perforated
>     flasks are a gimmick. I tend to believe them. I have tried both
>     perforated as well as solid and I can't tell a difference. The
>     perforated have frequently not had good seals while my solid flasks
>     have performed flawlessly.

    The perforations hold the investment in the larger flasks. That is
    the main difference. Especially with larger flasks the difference in
    thermal expansion between the investment and the flask will make the
    investment loose in the flask and on a couple of occasions I have
    seen it slide right out of the flask with a solid flask. 

Jim

Jim Binnion
James Binnion Metal Arts
Phone (360) 756-6550
Toll Free (877) 408 7287
Fax (360) 756-2160
http://www.mokume-gane.com
jbin AT mokume-gane.com
Member of the Better Business Bureau

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