Teraethoxysilane TEOS Crosile® Si40

Ethyl silicate Crosile® Si40 is an organic silicon compound with good solubility, stability and weather resistance, which is widely used in building materials, coatings, paints, cosmetics, electronic materials and other fields.

Item NO.:
Crosile® Si40
Chemical Name:
Tetraethyl orthosilicate
Chemical Formula:
C2H6O3SI
CAS No.:
11099-06-2;68412-37-3
EINECS No:
234-324-0
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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Ethyl Silicate 40 (TEOS) Crosile® Si40

SiSiB® PC5424

Chemical Properties

Crosile® Si40 (Ethyl Silicate 40) is a partially hydrolyzed ethyl silicate with a silica (SiO₂) content of approximately 40%. It is a partially condensed organosilicon compound with good solubility, excellent thermal stability, weather resistance, and chemical resistance.

After hydrolysis and condensation, Crosile® Si40 forms a durable silica network, making it suitable for zinc-rich coatings, inorganic binders, foundry applications, building materials, and specialty chemical processes.

Equivalent type

Ethyl silicate, TEOS, Tetraethoxysilane, Silicon ethoxide, Tetraethoxysilan, Silicon tetraethoxide, Silane Coupling Agent, Teraethoxysilane, Silicic acid ethyl ester, Ethyl polysilicate, Ethyl silicate, tetraethyl orthosilicate

Specifications

Test Item	Target Values (Spec, Limits)
Appearance	Colorless Transparent Liquid
SiO₂ Content	40%
Flash Point	Min.62°C
Boiling Point	160°C
Refractive Index	1.397

Application

Building Materials

Used as a binder for calcium silicate boards, diatomaceous earth products, and aluminum silicate materials.
Improves hardness, water resistance, and weather resistance of building materials.

Coatings and Paints

Binder for zinc-rich anti-corrosion coatings.
Improves the dispersion and stability of zinc powder in coating formulations.
Enhances adhesion, weather resistance, corrosion resistance, and durability of protective coatings.
Suitable for heavy-duty anti-corrosion coatings used on steel structures, bridges, marine facilities, and industrial equipment.

Key Benefits

Approximately 40% silica (SiO₂) content after hydrolysis
Excellent thermal stability
Good weather resistance
Good chemical resistance
Good compatibility with organic solvents
Forms durable silica networks after hydrolysis
Excellent binder performance for zinc-rich coatings
Suitable for coatings, foundry, building materials, and specialty chemical applications