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333859

Sigma-Aldrich

Tetraethyl orthosilicate

99.999% trace metals basis

Synonym(s):

Orthosilicic acid tetraethyl ester, Silicon tetraethoxide, TEOS, Tetraethoxysilane, Tetraethoxysilicon(IV), Tetraethyl silicate

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About This Item

Linear Formula:
Si(OC2H5)4
CAS Number:
78-10-4
Molecular Weight:
208.33
Beilstein/REAXYS Number:
1422225
EC Number:
201-083-8
MDL number:
MFCD00009062
UNSPSC Code:
12352103
PubChem Substance ID:
24860192
NACRES:
NA.23

Key Documents

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vapor density

7.2 (vs air)

Quality Level

200

vapor pressure

<1 mmHg ( 20 °C)

assay

99.999% trace metals basis

form

liquid

refractive index

n20/D 1.382 (lit.)

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 used as a precursor for the synthesis of silica-based materials by methods such as sol gel technique, due to its high affinity to water. It can also be used in the synthesis of blended membranes.

Application

Commonly used as a precursor to prepare xerogel
TEOS is majorly used as a silicon source in the synthesis of silicon oxide which can be further used in a variety of optoelectronics based applications. It can also be used in the formation of hybrid coatings for potential usage in corrosion protection.
Will interact with dodecylamine in the formation of intercalation compounds of H+-magadiite and used in a study of mixed-metal bioactive glasses.

pictograms

FlameExclamation mark
GHS02,GHS07

signalword

Warning

Hazard Classifications

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

target_organs

Respiratory system

Storage Class

3 - Flammable liquids

wgk_germany

WGK 1

flash_point_f

113.0 °F - closed cup

flash_point_c

45 °C - closed cup

ppe

Eyeshields, Faceshields, Gloves, type ABEK (EN14387) respirator filter

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Certificates of Analysis (COA)

Lot/Batch Number
MKCP3465
MKCJ6565
SHBK9149
MKCD9057
MKBZ8687V

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Fabrication of tunable silica-mineralized nanotubes using flagella as bio-templates
Jo W, et al.
Nanotechnology, 23(5) (2012)
Deposition of thick TEOS PECVD silicon oxide layers for integrated optical waveguide applications
Bulla DAP and Morimoto NI
Thin Solid Films, 334(1-2), 60-64 (1998)
Deposition of thick TEOS PECVD silicon oxide layers for integrated optical waveguide applications
Bulla DAP and Morimoto NI
Thin Solid Films, 334, 60-64 (1998)
Sol-gel-derived hybrid coatings for corrosion protection
Chou TP, et al.
Journal of Sol-Gel Science and Technology, 26(1-3), 321-327 (2003)
A performance evaluation of direct methanol fuel cell using impregnated tetraethyl-orthosilicate in cross-linked polymer membrane
Jung DH, et al.
International Journal of Hydrogen Energy, 26(12), 1263-1269 (2001)
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