Basic information
- Name:
Tridymite (SiO2) (9CI)
- CAS No.:
15468-32-3
- Molecular Structure:
- Formula:
- O2Si
- Synonyms:
- Tridymite(8CI); Christensenite; Tridymite 118; a-Tridymite
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Chemistry
Empirical Formula: O2Si
Molecular Weight: 60.0843
IUPAC Name: dioxosilane
Stability: Stable from 870–914° at atmospheric pressure, but persists as a metastable phase below 8°C forming low tridymite below 1°C and middle tridymite from 117–1°C. IDLH 25 mg/m3
Appearance: White or colorless platelets or orthorhombic crystals
Synonyms: Silica ; Quartz ; Cristobalite ; Sand ; Dioxosilane ; Diatomite ; Tridymite ; Aerosil ; Silicic anhydride
Following is the molecular structure of Silica , Cristobalite&ndash ; Tridymite (15468-32-3):
Toxicity Data With Reference
| 1. | sce-hmn:lyms 13,514 µg/kg | BJIMAG British Journal of Industrial Medicine. 47 (1990),110. | ||
| 2. | ihl-hmn TCLo:16 mppcf/8H/17.9Y-I:PUL | NTIS** National Technical Information Service. (Springfield, VA 22161) (Formerly U.S. Clearinghouse for Scientific and Technical Information) PB246-697 . | ||
| 3. | itr-rat LDLo:200 mg/kg | BJIMAG British Journal of Industrial Medicine. 10 (1953),9. |
Consensus Reports
Consensus of Silica , Cristobalite&ndash ; Tridymite (15468-32-3):
NTP 10th Report on Carcinogens. IARC Cancer Review: Group 2A IMEMDT IARC Monographs on the Evaluation of Carcinogenic Risk of Chemicals to Man . 7 ,1987,p. 341.(World Health Organization, Internation Agency for Research on Cancer,Lyon, France.: ) (Single copies can be ordered from WHO Publications Centre U.S.A., 49 Sheridan Avenue, Albany, NY 12210) ; Animal Sufficient Evidence IMEMDT IARC Monographs on the Evaluation of Carcinogenic Risk of Chemicals to Man . 42 ,1988,p. 209.(World Health Organization, Internation Agency for Research on Cancer,Lyon, France.: ) (Single copies can be ordered from WHO Publications Centre U.S.A., 49 Sheridan Avenue, Albany, NY 12210) ; Human Limited Evidence IMEMDT IARC Monographs on the Evaluation of Carcinogenic Risk of Chemicals to Man . 42 ,1988,p. 209.(World Health Organization, Internation Agency for Research on Cancer,Lyon, France.: ) (Single copies can be ordered from WHO Publications Centre U.S.A., 49 Sheridan Avenue, Albany, NY 12210) .
Safety Profile
Confirmed carcinogen with experimental tumorigenic data. Poison by intratracheal route. Human systemic effects by inhalation: cough, dyspnea. About twice as toxic as silica in causing silicosis. Mutation data reported.
Standards and Recommendations
Standards of Silica , Cristobalite&ndash ; Tridymite (15468-32-3):
OSHA PEL: Total Dust: TWA 30 mg/m3/2(%SiO2+2) TWA 0.05 mg/m3
ACGIH TLV: (Silica, Crystalline) TWA Respirable Fraction: 0.05 mg/m3
DFG MAK: 0.15 mg/m3
NIOSH REL: TWA 50 µg/m3
Analytical Methods
For occupational chemical analysis use OSHA: #ID-125G or NIOSH: Silica, crystalline (XRD), 7500; (Color), 7601; (IR), 7602.
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