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.

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Tetraethyl Orthosilicate (TEOS) Crosile® SI28, SI32, SI40 | Silane Coupling Agent | Ecopower

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

Crosile-TEOS (Tetraethl Orthosilicate) Application

TEOS (Tetraethyl Orthosilicate) is widely used as a silicone rubber crosslinking agent, ceramic binder, and coatings additive. Key applications include:

Adhesion Promoter: Enhances paint and coating adhesion to metal, glass, and wood surfaces.
Precision Casting: Used in ceramic molds for steel casting applications.
Semiconductor Industry: Precursor for silicon dioxide (SiO₂) deposition.

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.