[Jewelry making - Article 00417] - Re: [Orchid] Silicosis and quenching

[James Binnion]

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>     It is simply not true that the lungs cannot expel silica. 

    Sub micron sized dust cannot be expelled because it lodges deep in
    the lungs and will not dislodge or dissolve. Larger particles are
    trapped higher in the lung are indeed expelled through normal
    processes. It is these.2-.5 micron particles that scar the lung
    tissue and cause reduced oxygen uptake. It is not a new disease it
    is just that we have only recently developed an understanding of it
    and its causes. The Federal acknowledgment of its seriousness and
    push to start taking appropriate safety measures only began in the
    late 90's. 

    See http://www.cdc.gov/elcosh/docs/d0200/d000291/d000291.html 

>     If that were so we would all be dead from silicosis, and it would
>     be the leading cause of death. It's also simply not true that silica
>     is toxic - it is completely non-toxic. It is hazardous, which is
>     different. 

    It is not toxic by ingestion but is by inhalation. It is considered
    toxic because it can cause cancer, silicosis and COPD all of which
    can cause death. 

    Taking proper safety precautions appropriate to the size of the shop
    and amount of exposure need not be expensive or onerous but ignoring
    it just because you don't believe in the problem is foolish. 

    This thread is way beyond beaten to death, 

Regards,

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