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Tridymite (SiO2) (9CI) (15468-32-3)

Identification
Name:Tridymite (SiO2) (9CI)
Synonyms:Tridymite(8CI); Christensenite; Tridymite 118; a-Tridymite
CAS:15468-32-3
EINECS: 239-487-1
Molecular Formula: O2Si
Molecular Weight: 60.09
InChI: InChI=1/O2Si/c1-3-2
Molecular Structure: (O2Si) Tridymite(8CI); Christensenite; Tridymite 118; a-Tridymite
Properties
Melting Point: 3110 deg F
Flash Point: °C
Boiling Point: °Cat760mmHg
Density:g/cm3
Solubility:Insoluble
Silica is rather poorly soluble in water although solubility is higher for the amorphous than for the crystalline morphologies. ... The external amorphous layer in quartz is more soluble than the crystalline underlying core.
AMORPHOUS IS SOL IN ALKALIES, ESP WHEN FINELY DIVIDED
Report:

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) .

Flash Point: °C
Color: Amorphous powder
Transparent to gray powder (Note: Amorphous silica is the non-crystalline form of O2Si). ... solid
Silica gel is a coherent, rigid, continuous three-dimensional network of spherical particles of colloidal microporous silica.
Safety Data
Hazard Symbols TLV: (silica, crystalline) Respirable Fraction: 0.05 
 

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