Tetraethyl Orthosilicate/TEOS
- Synonym: tetraethoxysilane; ethyl silicate, tetra-
- CAS Number: 78-10-4
- EC Number: 201-083-8
| Product Code | GC-004 |
| CAS Number | 78-10-4 |
| Assay (purity) | 99.8% |
| Purity Method | by GC |
| Molecular Weight | 208.33 g/mol |
| Form | liquid |
| Appearance | Colourless liquid |
| Sensitivity | |
| Melting Point | −77°C |
| Molecular Formula | SiC8H20O4 |
| Linear Formula |
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Safety Information
| Signal Word | Warning |
| Pictograms |
|
| Hazard Statements | H226, H319, H332, H335,H413 |
| Precautionary Statements | P210, P261, P273, P312, P370+P378, P403+P233, P403+P235, P501 |
| UN | 1292 |
| Transport Description | TETRAETHYL SILICATE |
| Hazardous Class | 3 |
| Packing Group | III |
| In TSCA Registry | Yes |
Certificates of Analysis (CoA)
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External Identifiers
| Pubchem CID | |
| SMILES | CCO[Si](OCC)(OCC)OCC |
| IUPAC Name | Tetraethyl orthosilicate |
| InchI Identifier | 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 |
Other Customers Often Ask:
TEOS is mainly used as a crosslinking agent in silicone polymers and as a precursor to silicon dioxide in the semiconductor industry.
TEOS is also used as the silica source for synthesis of some zeolites.
Other applications include coatings for carpets and other objects. TEOS is used in the production of aerogel. These applications exploit the reactivity of the Si-OR bonds. TEOS has historically been used as an additive to alcohol based rocket fuels to decrease the heat flux to the chamber wall of regeneratively cooled engines by over 50%.
As precursor to siloxanes.
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