If this product has an expiration or retest date, it will be shown on the Certificate of Analysis (COA, CofA). If there is no retest or expiration date listed on the product's COA, we do not have suitable stability data to determine a shelf life. For these products, the only date on the COA will be the release date; a retest, expiration, or use-by-date will not be displayed.
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For products without retest or expiration dates, our standard warranty of 1 year from the date of shipment is applicable.
For more information, please refer to the Product Dating Information document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/418/501/product-dating-information-06-25-mk.pdf
86578
Tetraethyl orthosilicate
≥99.0% (GC)
Synonyma:
Orthosilicic acid tetraethyl ester, Silicon tetraethoxide, TEOS, Tetraethoxysilane, Tetraethoxysilicon(IV), Tetraethyl silicate
Vybrat velikost
| Vám/SKU | Dostupnost | Cena |
|---|---|---|
250 mL | Obraťte se na zákaznický servis a vyžádejte si informaci o dostupnosti. | 1 030,00 Kč |
1 L | Obraťte se na zákaznický servis a vyžádejte si informaci o dostupnosti. | 3 140,00 Kč |
O této položce
1 030,00 Kč
vapor density
7.2 (vs air)
Quality Segment
vapor pressure
<1 mmHg ( 20 °C)
assay
≥99.0% (GC)
form
liquid
technique(s)
GC/GC: suitable
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
General description
Application
- 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.
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Tato položka | |||
|---|---|---|---|
| description ≥99.0% (GC) | description 99.999% trace metals basis | description reagent grade, 98% | description purum, ≥98.0% (GC) |
| Quality Level 200 | Quality Level 200 | Quality Level 200 | Quality Level 200 |
| assay ≥99.0% (GC) | assay 99.999% trace metals basis | assay 98% | assay ≥98.0% (GC) |
| technique(s) GC/GC: suitable | technique(s) - | technique(s) - | technique(s) - |
| form liquid | form liquid | form liquid | form liquid |
| vapor density 7.2 (vs air) | vapor density 7.2 (vs air) | vapor density 7.2 (vs air) | vapor density 5.25 (vs air) |
| bp 168 °C (lit.) | bp 168 °C (lit.) | bp 168 °C (lit.) | bp 121-122 °C (lit.) |
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Výstražné slovo
Warning
Kódy nebezpečí
Bezpečnostní pokyny
Hazard Classifications
Acute Tox. 4 Inhalation - Eye Irrit. 2 - Flam. Liq. 3 - STOT SE 3
Cílové orgány
Respiratory system
Skladovací třída
3 - Flammable liquids
Bod vzplanutí (°F)
113.0 °F - closed cup
Bod vzplanutí (°C)
45 °C - closed cup
PPE (osobní ochranné prostředky)
Eyeshields, Faceshields, Gloves, type ABEK (EN14387) respirator filter
Seznamy omezení vyplývajících z předpisů
Seznamy omezení vyplývajících z předpisů jsou poskytovány zejména pro chemické produkty. Pro jiné než chemické produkty lze poskytovat pouze omezené informace. Žádný záznam znamená, že v seznamech není obsažena žádná ze součástí. Povinností uživatele je zajistit bezpečné a zákonné použití produktu.
78-10-4
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How can I determine the shelf life / expiration / retest date of this product?
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How is shipping temperature determined? And how is it related to the product storage temperature?
1 answer-
Products may be shipped at a different temperature than the recommended long-term storage temperature. If the product quality is sensitive to short-term exposure to conditions other than the recommended long-term storage, it will be shipped on wet or dry-ice. If the product quality is NOT affected by short-term exposure to conditions other than the recommended long-term storage, it will be shipped at ambient temperature. As shipping routes are configured for minimum transit times, shipping at ambient temperature helps control shipping costs for our customers. For more information, please refer to the Storage and Transport Conditions document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/316/622/storage-transport-conditions-mk.pdf
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What is the thermal conductivity of TEOS?
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Unfortunately, the thermal conductivity of this product is not determined.
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What is the electrical conductivity or resistivity of TEOS
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This product is not tested for electrical conductivity. The compound is not expected to be a conductive material. The presence of TEOS in various coatings may impact the conductivity or resistivity of a given target compound, such as a metallic nanoparticle. See the links below to review articles that may be of interest:
https://www.researchgate.net/figure/Effect-of-the-addition-of-TEOS-on-a-density-b-resistivity-c-residual-magnetic_fig5_371096514
https://link.springer.com/article/10.1007/s12633-019-00180-yHelpful?
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According to the theise, TEOS was used in units of g. Do you sell powder or solid TEOS?
1 answer-
Tetraethyl orthosilicate is only available in the liquid state. The melting point of the pure compound is -82.5 °C. The density of this material is 0.933 g/mL.
See the link below to review the PubChem profile.
https://pubchem.ncbi.nlm.nih.gov/compound/Tetraethyl-orthosilicate#section=Melting-PointHelpful?
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What is the vapor pressure of Tetraethyl orthosilicate (TEOS), Product No. 86578, at room temperature?
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The vapor pressure of TEOS at room temperature is 1.5 Torr.
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How do you create a sol-gel with Tetraethyl orthosilicate (TEOS), Product No. 86578?
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TEOS can be polymerized with water; the polymerization is based on the hydrolysis or the Si-O-Et groups through forming networks linked by Si-O-Si groups.
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How does the storage temperature relate to shipping conditions?
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The storage conditions that a Sigma-Aldrich catalog and label recommend for products are deliberately conservative. For many products, long-term storage at low temperatures will increase the time during which they are expected to remain in specification and therefore are labeled accordingly. Where short-term storage, shipping time frame, or exposure to conditions other than those recommended for long-term storage will not affect product quality, Sigma-Aldrich will ship at ambient temperature. The products sensitive to short-term exposure to conditions other than their recommended long-term storage are shipped on wet or dry ice. Ambient temperature shipping helps to control shipping costs for our customers. At any time, our customers can request wet- or dry-ice shipment, but the special handling is at customer expense if our product history indicates that the product is stable for regular shipment.
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What type of applications can Product No. 86578, Tetraethyl orthosilicate (TEOS), be used in?
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TEOS can be used to synthesize sol-gels or aerogels.
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What are the applications of sol-gels formed from Tetraethyl orthosilicate (TEOS), Product No. 86578?
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One of the most improtant application of the sol-gel process is the snythesis of zeolites. Other applications are optical ceramic materials or functionalized biosensors.
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