[Jewelry making - Article 01795] - Re: [Orchid] Understanding casting shrinkage

[James Binnion]

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>     Just a few more thoughts. I always plunge my castings into the
>     bucket fast. There is really no chance for the material to
>     vaporize. The flask goes the eight or so inches immediately,
>     rumbles to a stop and is then removed and cleaned. I've never really
>     seen anything rise to breath with this procedure. 

    If you have an air sample run you will find that there is indeed
    silica released into the air when you do this. Not as much as when
    you go slowly but it is there. The sub micron dust is so fine it
    will sty in the air for long periods of time. All quenching of flasks
    should be done in a properly ventilated space. Better yet wait till
    cold and use a water blast system to remove castings. Then there is
    no sub micron silica dust released into the air. 

James Binnion
jbin AT mokume-gane.com
James Binnion Metal Arts
http://www.mokume-gane.com
360-756-6550
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