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silicon dioxide |
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silicon /sil·i·con/ (sil´ĭ-kon) a chemical element, at. no. 14, symbol Si. silicon carbide a compound of silicon and carbon used in dentistry as an abrasive agent. silicon dioxide silica.
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| At the time, the question had been answered in such a way that satisfied many of the actors involved: The current permissible exposure limit (PEL) for respirable crystalline silica (also called quartz) was set according to a mathematical formula: 10 divided by the percentage of quartz plus two. The purposes of this study were a) to summarize measurements of airborne (respirable) crystalline silica dust exposure levels among U. This disabling and sometimes fatal lung disease is caused by overexposure to respirable crystalline silica or quartz, the second most common mineral in the earth's crust. |
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