Fumed Silica

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Linear Formula:


MDL Number:


EC No.:



>99% Fumed Silica Powder
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Fumed Silica Properties (Theoretical)

Molecular Weight 60.08
Appearance White Powder
Melting Point 1,600° C
Boiling Point 2,230° C
Density ~2.3-4.5 g/cm3
Size Range 5–50 nm
Specific Surface Area 200-390 m2/g
Morphology Spherical
Solubility in H2O N/A

Fumed Silica Health & Safety Information

Signal Word N/A
Hazard Statements N/A
Hazard Codes N/A
RTECS Number N/A
Transport Information N/A

About Fumed Silica

Fumed Silica is a powder composed of submicron-sized amorphous silica spheres arranged in branching chains of varying lengths. To produce fumed silica, silicon tetrachloride or quartz is burnded in a flame of hydrogen and oxygen to yield molten uniform-sized spheres that subsequently fuse into three-dimensional aggregates. Though the lengths and shapes of these chains differ (lending it an enormous external surface area), the size of the spheres themselves can be controlled during the preparation process. Fumed silica exhibits thixotropic properties and is typically used as a dessicant, thickening and anti-caking agent, and stabilizer in pharmaceuticals, cosmetics, paints and coatings, sealants, and gel-cell batteries (as an additive to acid-based electrolytes). American Elements can produce both hydrophilic and hydrophobic (treated) fumed silica in a range of different sizes and surface areas;

Fumed Silica Synonyms

Pyrogenic silica; Silica fume; Fumed colloidal silica; Silica, fumed; silicic anhydride; fumed silicon dioxide; Aerosil; Cab-O-Sil; Cabosil; silicon dioxide amorphous, synthetic amorphous silica; colloidal silicon dioxide, ts-100 acematt, White Carbon Black

Chemical Identifiers

Linear Formula SiO2
MDL Number MFCD00011232
EC No. 262-373-8
Beilstein/Reaxys No. N/A
Pubchem CID N/A
IUPAC Name Dioxosilane
InchI Identifier InChI=1S/O2Si/c1-3-2

Packaging Specifications

Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and steel drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Shipping documentation includes a Certificate of Analysis and Safety Data Sheet (SDS). Solutions are packaged in polypropylene, plastic or glass jars up to palletized 440 gallon liquid totes, and 36,000 lb. tanker trucks.

Related Elements


See more Silicon products. Silicon (atomic symbol: Si, atomic number: 14) is a Block P, Group 14, Period 3 element with an atomic weight of 28.085. Silicon Bohr MoleculeThe number of electrons in each of Silicon's shells is 2, 8, 4 and its electron configuration is [Ne] 3s2 3p2. The silicon atom has a radius of 111 pm and a Van der Waals radius of 210 pm. Silicon was discovered and first isolated by Jöns Jacob Berzelius in 1823. Silicon makes up 25.7% of the earth's crust, by weight, and is the second most abundant element, exceeded only by oxygen. The metalloid is rarely found in pure crystal form and is usually produced from the iron-silicon alloy ferrosilicon. Elemental SiliconSilica (or silicon dioxide), as sand, is a principal ingredient of glass, one of the most inexpensive of materials with excellent mechanical, optical, thermal, and electrical properties. Ultra high purity silicon can be doped with boron, gallium, phosphorus, or arsenic to produce silicon for use in transistors, solar cells, rectifiers, and other solid-state devices which are used extensively in the electronics industry.The name Silicon originates from the Latin word silex which means flint or hard stone.


July 15, 2024
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