| Agent Name |
Mica, respirable dust |
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| CAS Number |
12001-26-2 |
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| Formula |
varies |
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| Major Category |
Mineral Dusts |
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| Synonyms |
Biotite, Lepidolite, Margarite, Muscovite, Phlogopite, Roscoelite, Zimmwaldite roscoelite. |
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| Category |
Other Mineral Dusts |
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| Description |
Colorless, odorless flakes or sheets of hydrous silicates; |
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| Sources/Uses |
Mica, mainly muscovite and phlogopite, contains less than 1% quartz. Other species of mica are biotite, lepidolite, zimmwaldite, and roscoelite. Mica is used in shingles, wallpaper, and insulation. It is also used in oil well drilling, mold releasing, filtering, and in manufacturing heat-resistant windows. [ACGIH] |
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| Comments |
Mica workers in India with 18 years of exposure to 20 mppcf showed evidence of mild pneumoconiosis on chest x-rays. [ACGIH] |
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| Exposure Assessment |
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| Skin Designation (ACGIH) |
No |
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| Bioaccumulates |
Yes |
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| TLV (ACGIH) |
3 mg/m3, respirable fraction |
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| PEL (OSHA) | 20 mppcf, < 1% crystalline silica |
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| IDLH (NIOSH) |
1500 mg/m3 |
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| Excerpts from Documentation for IDLHs |
Basis for revised IDLH: The available toxicological data contain no evidence that an acute exposure to a high concentration of mica would impede escape or cause any irreversible health effects within 30 minutes. |
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| Adverse Effects |
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| Fibrogenic |
Yes |
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| Links to Other NLM Databases |
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| Health Studies |
Human Health Effects from Hazardous Substances Data Bank: MICA
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