Tetraethyl Orthosilicate TEOS Crosile® Si28 Si32 Si40

Tetraethyl orthosilicate, also known as tetraethoxysilane (TEOS), is an organic compound denoted by the formula Si(OC2H5)4. This colorless liquid undergoes degradation when exposed to water. TEOS serves as the ethyl ester of orthosilicic acid, Si(OH)4, and is widely recognized as the predominant silicon alkoxide. 

  • Item NO.:

    TEOS Silane
  • Chemical Name:

    Tetraethyl orthosilicate
  • Chemical Formula:

    C2H6O3SI
  • CAS No.:

    78-10-4,11099-06-2,68412-37-3
  • Properties:

    Colorless transparent liquid; Soluble in a variety of organic solvents; Easy to hydrolysis; Able for condensation to form polysiloxanes; Easy to polymerize in the presence of overheating, light and peroxide.

Tetraethyl Orthosilicate (TEOS) Crosile® SI28, 32, 40 

 

Chemical Properties

Ethyl silicate, formally referred to as tetraethyl orthosilicate or tetraethoxysilane (TEOS), is an organic chemical compound represented by the formula Si(OC2H5)4. It exists in the form of a colorless liquid and can deteriorate upon contact with water. TEOS functions as the ethyl ester of orthosilicic acid, Si(OH)4, and is renowned as the most abundant silicon alkoxide. 

 

Equivalent type
Ethyl silicate, TEOS, Tetraethoxysilanemincolorlessliq, Tetraethoxysilane, Silicon ethoxide, Tetraethoxysilan, Silicon tetraethoxide, Silane Coupling Agent Si, Teraethoxysilane, Silicic acid, ethyl ester, Ethyl polysilicate, Ethyl Silicate, ethoxy(oxo)silanol, diethoxy(oxo)silane, X-28, tetraethyl orthosilicate, Silquest TEOS, X-669

 

Specifications

Test Item

Target Values(Spec, Limits)

Appearance

Colorless Transparent Liquid

Chemical name

Crosile® SI28

Crosile® SI32

Crosile® SI40

SiO2 Content

28%

32%

40%

Flash Point

181°C 38°C Min.62°C

Boiling Point

169°C

96°C

160°C

Refractive Index

1.3830

1.00

1.397

 

Application

TEOS, or tetraethyl orthosilicate, is a versatile compound with various applications. It is commonly used as a crosslinking agent in silicone polymers and as a precursor to silicon dioxide in the semiconductor industry. TEOS is also utilized as a source of silica for synthesizing certain zeolites. Additionally, it finds use in coatings for carpets and other objects, as well as in the production of aerogel. These applications take advantage of the reactivity of the Si-OR bonds present in TEOS.

Furthermore, TEOS has a historical application as an additive in alcohol-based rocket fuels, significantly reducing heat flux in regeneratively cooled engines by over 50%. In the steel casting industry, TEOS serves as an inorganic binder and stiffener for creating silica-based ceramic molding forms. It can also be used as an inorganic binder for coatings, providing water, oxygen, and high-temperature resistance to materials like steel, glass, brass, and even wood. TEOS acts as an additive in solid polymers, enhancing adhesiveness to glass, steel, or wood surfaces. Moreover, it acts as a binder for porcelain teeth crowns and serves as a precursor to siloxanes, further expanding its range of applications.

  • Adhesion promoter for paints & coatings
  • Precision casting materials and ceramic materials
  • Silicone rubber cross-linking agent.

Tetraethyl Orthosilicate (TEOS) Crosile® SI28,32,40 

 

Packing:

16 kg /drum, 180 kg /drum.

 

Storage:

Kept in a low temperature, dry and ventilated place, avoid direct sunlight.

 

Shelf life:

One year in a ventilating, cool and dry area.

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