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131903

Sigma-Aldrich

Tetraethyl orthosilicate

reagent grade, 98%

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Synonym(s):
Orthosilicic acid tetraethyl ester, Silicon tetraethoxide, TEOS, Tetraethoxysilane, Tetraethoxysilicon(IV), Tetraethyl silicate
Linear Formula:
Si(OC2H5)4
CAS Number:
Molecular Weight:
208.33
Beilstein:
1422225
EC Number:
MDL number:
PubChem Substance ID:
NACRES:
NA.23

grade

reagent grade

Quality Level

vapor density

7.2 (vs air)

vapor pressure

<1 mmHg ( 20 °C)

Assay

98%

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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Application

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.

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

Regulatory Information

危险化学品

Certificates of Analysis (COA)

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Lot and Batch Numbers can be found on a product's label following the words 'Lot' or 'Batch'.

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  1. Which document(s) contains shelf-life or expiration date information for a given product?

    If available for a given product, the recommended re-test date or the expiration date can be found on the Certificate of Analysis.

  2. How do I get lot-specific information or a Certificate of Analysis?

    The lot specific COA document can be found by entering the lot number above under the "Documents" section.

  3. Is anything else needed to use Product 131903, Tetraethyl Orthosilicate in a hydrolysis reaction?

    An acid or alkali catalyst is needed to do a hydrolysis reaction to free the silanol group for use.

  4. What is the solubility of Product 131903, Tetraethyl Orthosilicate?

    According to the 13th Edition of the chemicals encyclopedia published by the Royal Society of Chemistry, Tetraethyl Orthosilicate is practically insoluble in water and is slowly decomposed by it.  It is miscible with alcohol.

  5. Product 131903, Tetraethyl orthosilicate  is commonly used as a precursor to prepare xerogel.  What is xerogel?

    A xerogel is a solid formed from a gel by drying with unhindered shrinkage.  Xerogel usually retains high porosity and large surfaced area, along with very small pore size. 

  6.  How can I purify Product 131903, Tetraethyl Orthosilicate?

    Fractionate through an 80cm Podbielniak type column with heated jacket and partial take-off head.  [Purification of Laboratory Chemicals Fourth Ed]

  7. What is the freezing point of Product 131903, Tetraethyl Orthosilicate?

    The freezing point is ~85°C.

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