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| CAS No.: | 15468-32-3 | |
|---|---|---|
| Name: | tridymite | |
| Article Data: | 122 | |
| Molecular Structure: | ||
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| Formula: | O2Si | |
| Molecular Weight: | 60.0843 | |
| Synonyms: | Tridymite(8CI); Christensenite; Tridymite 118; a-Tridymite | |
| Density: | g/cm3 | |
| Melting Point: | 1470°C | |
| Boiling Point: | °Cat760mmHg | |
| Flash Point: | °C | |
| Hazard Symbols: | TLV: (silica, crystalline) Respirable Fraction: 0.05 mg/m3. | |
| Safety: | 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. See also SILICA, AMORPHOUS FUME; SILICA, AMORPHOUS FUMED; SILICA, AMORPHOUS HYDRATED; SILICA, CRYSTALLINE; SILICA, CRYSTALLINE–CRISTOBALITE; SILICA, CRYSTALLINE–QUARTZ; SILICA FLOUR; SILICA, FUSED; SILICA, GEL and AMORPHOUS–PRECIPITATED. | |
Analytical Methods: | For occupational chemical analysis use OSHA: #ID-125G or NIOSH: Silica, crystalline (XRD), 7500; (Color), 7601; (IR), 7602. |
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| PSA: | 34.14000 | |
| LogP: | -0.61840 | |
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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.