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Description and features

SilQon OCTEO ( Octyltriethoxysilane ), is a colorless clear liquid which has
C14H32O3Si  as chemical formula, is used in polymer preparations, coatings, personal care and household products, tyre production and sealants.

Octyltriethoxysilane is also known as octyltriethoxysilane and triethoxyoctylsilane.


Europe and United States: Provided {{Product}} is on stock in our local warehouses our lead time is about one week if delivered in 200 KG steel drums.

Canada, South America, South Africa and other markets can also be served, please contact our sales department for more details.

This substance (CAS: 2943-75-1) has been registered under REACH (EC) 1907/2006.

Product Identification

CAS number 2943-75-1
EC number 220-941-2
HS code 2931 90 00
EC name Triethoxyoctylsilane
IUPAC name Triethoxy(octyl)silane


Appearance Colorless clear liquid
Assay ≥ 98.00 %
Color (Pt-Co) ≤ 30
Refractive index 1.4090 – 1.4190


SilQon OCTEO can be used as a surface modifier to generate hydrophobicity (e.g. on concrete, glass, inorganic pigment, or mineral fillers). When diluted with an appropriate solvent, it can be used in the formulation of water repellent products. Upon proper application, the formulated product will penetrate and provide water repellency by chemically reacting with the cementitious substrate. Treated substrates are hydrophobic and retain their original appearance.


Available packaging: 20 KG drums, 170 KG drums, 870 KG IBC’s.
Special packaging is available on request.


Store Octyltriethoxysilane in a cool, dry and well-ventilated area and in line with legal requirements.


A Material Safety Data Sheets (MSDS) is available for Silqon OCTEO and all other products supplied by Vesta Chemicals BV.

An MSDS describes the hazards of a product and explains how a product can be safely handled, used and stored. Besides it provides important regulatory and emergency response information for the purchased product.

Molecular and structural information

Molecular formula C14H32O3Si
Molecular weight 276.49 g/mol
Smiles notation CCCCCCCC[Si](OCC)(OCC)OCC
Structural formula Octyltriethoxysilane

Physicochemical information

Boiling point 259.60 ºC
Bulk density 0.876 g/cm3 @ 25 ºC
Flash point 45 ºC @ 1013 hPa
Log Pow 5.6 @ 20 ºC
Solubility in water 0.79 mg/l @ 20 ºC
Vapor pressure 0.11 Pa @ 25 ºC
Octyltriethoxysilane | CAS:2943-75-1 | Disclaimer. This information is supplied solely for informational purposes and Vesta Chemicals bv makes no guarantees or warranties, either expressed or implied, with respect to the accuracy and use of this data. All product warranties and guarantees shall be governed by the Standard Terms of Sale. Nothing in this document is legal advice or is a substitute for competent legal advice.