333859

Tetraethyl orthosilicate

99.999% trace metals basis

• Synonym(s): Orthosilicic acid tetraethyl ester, Silicon tetraethoxide, TEOS, Tetraethoxysilane, Tetraethoxysilicon(IV), Tetraethyl silicate
• Linear Formula: Si(OC₂H₅)₄
• CAS Number: 78-10-4
• Molecular Weight: 208.33
• Beilstein: 1422225
• EC Number: 201-083-8
• MDL number: MFCD00009062
• UNSPSC Code: 12352103
• PubChem Substance ID: 24860192
• NACRES: NA.23

Properties

• vapor density: 7.2 (vs air)
• 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

Description

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

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.

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.

Safety Information

• Pictograms: GHS02,GHS07
• Signal Word: Warning
• Hazard Statements: H226,H319,H332,H335
• Precautionary Statements: P210 - P233 - P240 - P241 - P304 + P340 + P312 - P305 + P351 + P338
• 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