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silicon dioxide |
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silicon dioxide: see silica silica or silicon dioxide, chemical compound, SiO2. It is insoluble in water, slightly soluble in alkalies, and soluble in dilute hydrofluoric acid. Pure silica is colorless to white. ..... Click the link for more information. . silicon dioxide(SiO2) A hard, glassy mineral found in such materials as rock, quartz, sand and opal. In MOS chip fabrication, it is used to create the insulation layer between the metal gates of the top layer and the silicon elements below. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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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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