[Jewelry making - Article 00810] - Re: [Orchid] Casting silver and silicosis risk

[Noel Yovovich]

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>     Asbestos may be different, but in the case of asbestos, the
>     particles that do the most damage are the ones that pass through
>     the respirator. 

    I'm not a doctor, so take that into account, but my understanding is
    that, in addition to the size of the asbestos particles, it is an
    issue of shape. The asbestos particles are sharp or raggedy in some
    way that keeps them from coming back out of the lungs once they're
    down there. I don't think the silica particles have that particular
    issue-- too many of them and you get black lung (or silicosis), but
    asbestos gives you cancer, and if you are unlucky, it doesn't need
    to be many particles-- I think. 

Noel
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