SILICA, CRYSTALLINE–TRIDYMITE supplier

Name
tridymite
EINECS
CAS No. 15468-32-3
Article Data122
CAS DataBase
Density g/cm³
Solubility
Melting Point 1470°C
Formula O2Si
Boiling Point °Cat760mmHg
Molecular Weight 60.0843
Flash Point °C
Transport Information
Appearance
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
Molecular Structure
Hazard Symbols TLV: (silica, crystalline) Respirable Fraction: 0.05 mg/m³.
Synonyms Tridymite(8CI); Christensenite; Tridymite 118; a-Tridymite
PSA 34.14000
LogP -0.61840

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.

Product Name

tridymite