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SILICA, CRYSTALLINE–TRIDYMITE

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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 Molecular Structure of 15468-32-3 (tridymite) Hazard Symbols TLV: (silica, crystalline) Respirable Fraction: 0.05 mg/m3.
Synonyms

Tridymite(8CI); Christensenite; Tridymite 118; a-Tridymite

Article Data 122

SILICA, CRYSTALLINE–TRIDYMITE Chemical Properties

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):

SILICA, CRYSTALLINE–TRIDYMITE 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.

SILICA, CRYSTALLINE–TRIDYMITE 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) .

SILICA, CRYSTALLINE–TRIDYMITE 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.      

SILICA, CRYSTALLINE–TRIDYMITE 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

SILICA, CRYSTALLINE–TRIDYMITE Analytical Methods

For occupational chemical analysis use OSHA: #ID-125G or NIOSH: Silica, crystalline (XRD), 7500; (Color), 7601; (IR), 7602.

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