| Message: | Silica
Another Name:Silicon dioxide SiO? ,Silicon(IV)oxide ,Silicic anhydride ,Quartz sand HYFLO;KIESELGUR;KIESELGEL;CELITE(R);CHEMIZORB;BETZ 0247;BETZ 0251;KIESELGUHR;CELITE 281;CELITE 503
CAS:215-684-8
Molecular Weight:60.084
Molecular Formula:SiO2
Density: 2.6 g/mL at 25 °C(lit.)
Melting Point: 1610 °C(lit.)
Boiling Point: 2230 °C
Solubility: insoluble in water
Risk Codes: 36/37/38-48/20
Appearance: granular abrasive solid of varied colour
MSDS: View
Properties: White to reddish crystals. Stable below 8°. Low ($$$) quartz, stable at room temp; transforms to high (β-) quartz at 5°; the two forms are related by small rotations of the SiO4 tetrahedron. Piezoelectric and pyroelectric. Mp: 1710°, bp: 2230°, d: 2.6. IDLH 25 mg/m3 (cristobalite, tridymite); 50 mg/m3 (quartz, tripoli).
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