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Fumed Silica
- Origin
- : China
- CAS Number
- : 7631-86-9
- HS Code
- : 2811.22.00
Basic Info
- IUPAC Name
- : silicon dioxide (amorphous/fumed)
- Molecular Formula
- : SiO2 (amorphous)
- Molecular Weight (g/mol)
- : 60.0800
- Synonyms & Trade Names
- : Fumed silica; Aerosil; Pyrogenic silica; Cab-O-Sil
- Purity / Assay (%)
- : 99.8% SiO2
- Grade / Quality Level
- : Technical Grade
- Physical Form
- : Solid
- Concentration
- : Pure substance
- Appearance / Color
- : White to off-white solid
- Odor
- : Odorless
- Solubility in Water
- : Insoluble
- Signal Word
- : Warning
- GHS Hazard Class
- : Skin irritant; Eye irritant; Respiratory irritant
- H-Statements
- : H315|H319|H335
- P-Statements
- : P261|P264|P271|P280
- REACH Status
- : Registered
- Drug Precursor Status
- : Non-precursor
- Storage Class (GHS)
- : 13
- Storage Conditions
- : Cool, dry place; avoid inhalation of dust
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Brief Overview
Fumed silica has a chemical formula SiO2. Silicon Dioxide is a natural compound of silicon and oxygen found mostly in sand. Silica has three main crystalline varieties: quartz, tridymite, and cristobalite. SiO2 are transparent, tasteless crystals found in nature as agate, amethyst, chalcedony, cristobalite, flint, sand, quartz, and tridymite. The compound is insoluble in water or acids except hydrofluoric acid. Silica is most commonly found in nature as sand or quartz, as well as in the cell walls of diatoms. Silica is the most abundant mineral in the Earth's crust.
Manufacturing Process
2H2 + O2 → 2H2O
SiCl4 + 2 H2O → SiO2 + 4HCl
2H2 + O2 + SiCl4 → SiO2 + 4HCl
Fumed silica is manufactured using the reactions above and a continuous flame hydrolysis process of silicon tetrachloride SiCl4. This process converts SiCl4 into the gas phase and reacts quantitatively and spontaneously with the water formed intermediately in an oxyhydrogen flame in order to obtain silicon dioxide.