Colloidal Silicon Dioxide
- CAS NO. : 7631-86-9
- CAT NO. : PH-EXC-1869
Physical State: Solid
Color/Appearance: White to off-white powder (transparent in some crystalline forms)
Melting Point: ~ 1,600-1,713 °C
Boiling Point: ~ 2,230-2,950 °C
Density: ~ 2.2-2.6 g/cm³ (depending on form, eg. amorphous vs crystalline)
Solubility: Practically insoluble in water; insoluble in most mineral acids except hydrofluoric acid; dissolves in hot alkali hydroxide solutions.
pKa: ~ 6.65-9.8 (slightly variable with form and conditions)
Storage Conditions: Store in dry, cool conditions; protect from moisture (the amorphous forms can be hygroscopic)
Molecular Formula: SiO₂
Molecular Weight: 60.08 g/mol
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