Rank: Forum user 
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Hi everyone,
I just wondered if anyone had any experience of handling silicon metal? The form I am interested in is small lump form stored in FIBCs.
Looking at the msds is looks fairly stable, but it does state that it is incompatible with water. Does anyone have any experience how incompatible it can be? I'm sure in dust / powder form it could be dangerous but how so in solid form?
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Rank: Super forum user
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Are you sure that you mean silicon? Silicon is a semi-metal. It looks metallic but behaves like a non-metal. It is relatively unreactive especially with water.
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Rank: Forum user
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It's called silicon metal on the msds sheet.
The CAS number is 7440-21-3 if that helps.
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Rank: Super forum user 
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There is a potential for silicon to react with water and produce hydrogen if the silicon is heated. I think the risk then is associated with fire?
Other than that, as far as I'm aware, there are no real health issues (beyond usual dust problems)?
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Rank: Super forum user
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Consulting 'Fisher's Contact Dermatitis' produces the following:-
"Silicon in powders can form granulomas in injured skin",
also
"Mercury, chromium, zirconium, beryllium, cobalt and silicon can produce sarcoid-type granulomas, which may be treated with intralesional corticosteroids."
Chris
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Rank: Forum user
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thank you all for your advice
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Rank: Super forum user
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Post #5 “Granulomas” sounds scary but all it refers to is the sort of lumps that form when just about anything (a splinter a bit of swarf etc) gets stuck under the skin. It is nothing sinister and confirms that silicon is really quite innocuous.
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