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Name |
SILICA, CRYSTALLINE–TRIDYMITE |
EINECS | N/A | |
CAS No. | 15468-32-3 | Density | g/cm3 | |
PSA | 34.14000 | LogP | -0.61840 | |
Solubility | N/A | Melting Point |
1470°C |
|
Formula | O2Si | Boiling Point | °Cat760mmHg | |
Molecular Weight | 60.0843 | Flash Point | °C | |
Transport Information | N/A | Appearance | N/A | |
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. |
Risk Codes | N/A | |
Molecular Structure | Hazard Symbols | TLV: (silica, crystalline) Respirable Fraction: 0.05 mg/m3. | ||
Synonyms |
Tridymite(8CI); Christensenite; Tridymite 118; a-Tridymite |
Article Data | 122 |
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):
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 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) .
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 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
For occupational chemical analysis use OSHA: #ID-125G or NIOSH: Silica, crystalline (XRD), 7500; (Color), 7601; (IR), 7602.