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86578

Sigma-Aldrich

Tetraethyl orthosilicate

≥99.0% (GC)

Synonym(s):
Orthosilicic acid tetraethyl ester, Silicon tetraethoxide, TEOS, Tetraethyl silicate, Tetraethoxysilane, Tetraethoxysilicon(IV)
Linear Formula:
Si(OC2H5)4
CAS Number:
Molecular Weight:
208.33
Beilstein:
1422225
EC Number:
MDL number:
PubChem Substance ID:
NACRES:
NA.22

vapor density

7.2 (vs air)

Quality Level

vapor pressure

<1 mmHg ( 20 °C)

assay

≥99.0% (GC)

form

liquid

refractive index

n20/D 1.382 (lit.)
n20/D 1.383

bp

168 °C (lit.)

density

0.933 g/mL at 20 °C (lit.)

SMILES string

CCO[Si](OCC)(OCC)OCC

InChI

1S/C8H20O4Si/c1-5-9-13(10-6-2,11-7-3)12-8-4/h5-8H2,1-4H3

InChI key

BOTDANWDWHJENH-UHFFFAOYSA-N

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General description

Tetraethyl orthosilicate (TEOS) is an inorganic material that can be used as a silica source for the synthesis of silica-based materials such as silicon dioxide, silicon oxycarbides, silanol, siloxane polymer, and organosilicon thin films for a variety of applications. It can also be used in the synthesis of blended membranes, and the production of aerogel. Other applications include coatings for carpets and other objects.

Application

Tetraethyl orthosilicate (TEOS) can be used:
  • As a reagent along with ferric chloride in the synthesis of dihydropyrimidinones.
  • As a modifier in fabrication of humidity sensing material, poly(2-acrylamido-2-methylpropane sulfonate) (poly-AMPS).
  • As a medium to synthesize triarylamines and diaryl ethers via copper catalyzed, ligand free-Ullmann reaction.
  • As a precursor for the preparation of silica xerogel which finds application in pharmaceutical drug carriers.
  • As a precursor for the synthesis of spherical silica particles by Stober process.

Commonly used as a precursor to prepare xerogel
Will interact with dodecylamine in the formation of intercalation compounds of H+-magadiite and used in a study of mixed-metal bioactive glasses.

Packaging

1 L in glass bottle
250 mL in glass bottle

Pictograms

FlameExclamation mark

Signal Word

Warning

Hazard Statements

Hazard Classifications

Acute Tox. 4 Inhalation - Eye Irrit. 2 - Flam. Liq. 3 - STOT SE 3

Target Organs

Respiratory system

Storage Class Code

3 - Flammable liquids

WGK

WGK 1

Flash Point(F)

113.0 °F - closed cup

Flash Point(C)

45 °C - closed cup

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

Certificate of Analysis

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Certificate of Origin

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