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Ethyl Silicate, 250ml #015-574
Ethyl Silicate, 250ml
Chemical Name:
Ethyl Silicate
CAS Number:
Chemical Formula:
TEOS, Tetraethyl Orthosilicate, Tetraethyl Silicate, Tetraethoxysilane

Detailed Product Description:

A colorless, combustible liquid with a faint alcohol odor that has been

hydrolyzed to an adhesive form of silica. Miscible in alcohol.

Decomposes in contact with water. Commonly used to waterproof

mortar and concretes, protective coatings and as a bonding agent.


This is Reagent/Semiconductor Grade material with minimum purity of 99%.


Tetraethyl Orthosilicate, often abbreviated TEOS, consists of four ethyl

groups attached to SiO4 ion. TEOS can be considered to be the ethyl ester

of orthosilicic acid, Si(OH)4. It is a prototypical alkoxide.


At elevated temperatures (>600 C), TEOS converts to silicon dioxide, hence

its use in the semiconductor industry. Otherwise, TEOS is mainly used as

a crosslinking agent in silicone polymers. Other applications include coatings

for carpets and other objects.

TEOS has the remarkable property of easily converting into silicon dioxide.

This reaction occurs upon the addition of water. The ensuing hydrolysis

reaction is an example of a sol-gel process. The side product is ethanol.

The reaction proceeds via a series of condensation reactions that convert the

TEOS molecule into a mineral-like solid via the formation of Si-O-Si linkages.

Rates of this conversion are sensitive to the presence of acids and bases, both

of which serve as catalysts.


Highly flammable. Harmful by inhalation.

Download, read, and understand the MSDS and the associated precautions

before using this substance.

Click here to download MSDS (Material Safety Data Sheet)


Comes packed in 250ml boston round, amber glass bottle. Also available in 500 ml size.

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