Tetraethyl orthosilicate
Tetraethyl orthosilicate (TEOS), CAS 78-10-4, is an organosilicon compound with the formula Si(OC2H5)4. This clear, colourless liquid serves as a crucial precursor in chemical synthesis, particularly for the formation of xerogels. With a molecular weight of 208.33 g/mol, it is widely employed in materials science and various industrial applications requiring silica-based materials. TSS supplies this compound with an assay of ≥99%.
- IUPAC
- Orthosilicic acid tetraethyl ester,TEOS,Tetraethoxysilane
- Synonyms
- Orthosilicic acid tetraethyl esterTEOSTetraethoxysilane
Xerogel Precursor
Tetraethyl orthosilicate is commonly employed as a chemical precursor for the synthesis of xerogels. This process involves sol-gel chemistry to create silica-based network structures.
Chemical Synthesis
TEOS functions as a versatile reagent in organic and inorganic synthesis. Its ability to undergo hydrolysis and condensation reactions makes it valuable for creating silicon-containing compounds and materials.
Silica Deposition
The compound can be used in methods for depositing thin films of silicon dioxide. These films are important in the semiconductor industry and for optical coatings.
| Molecular weight | 208.33 |
|---|---|
| Linear formula | Si(OC2H5)4 |
| Assay | ≥99% |
| Form | liquid |
| Boiling point | 168 °C(lit.) |
| Density | 0.933 g/mL at 20 °C(lit.) |
| Refractive index | n20/D 1.382(lit.) |
| Vapour pressure | <1 mmHg (20 °C) |
| Vapour density | 7.2 (vs air) |
| Application | Commonly used as a precursor to prepare xerogel1,2 |
Hazard statements
- H226Flammable liquid and vapour
- H319Causes serious eye irritation
- H332Harmful if inhaled
- H335May cause respiratory irritation
Precautionary statements
- P261Avoid breathing dust, fume, gas or vapours
- P305IF IN EYES
| Protective equipment | Eyeshields, Faceshields, full-face respirator (US), Gloves, multi-purpose combination respirator cartridge (US), type ABEK (EN14387) respirator filter |
|---|---|
| Flash point | 48 °C / 118.4 °F |
| Transport (UN / ADR) | UN 1292 3 / PGIII |
| Water hazard class (WGK, DE) | 1 |
| Hazard codes (EU) | Xn |
| Risk statements (R) | 10-20-36/37 |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
Documentation
Every batch ships with a Certificate of Analysis covering assay, identity and purity; the grade is confirmed against your enquiry. Safety Data Sheets and technical data sheets are available on request.
Supply & logistics
Samples for technical evaluation; bulk MOQ by grade and packaging. In-stock material ships in 7–10 working days, worldwide, with full export documentation.
What is Tetraethyl orthosilicate used for?
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Tetraethyl orthosilicate (TEOS) is primarily used as a precursor for preparing xerogels and in various chemical synthesis applications requiring silicon dioxide or organosilicon compounds.
What are the CAS number and formula for Tetraethyl orthosilicate?
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The CAS number for Tetraethyl orthosilicate is 78-10-4, and its chemical formula is Si(OC2H5)4.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies Tetraethyl orthosilicate with an assay of ≥99%. This is a technical or research grade material, and TSS does not represent it as USP, BP, or EP grade.
What are the main safety hazards associated with Tetraethyl orthosilicate?
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Tetraethyl orthosilicate is a flammable liquid (H226) and can cause serious eye irritation (H319), be harmful if inhaled (H332), and may cause respiratory irritation (H335). Appropriate personal protective equipment, including eyeshields, gloves, and respiratory protection, should be used.
How is Tetraethyl orthosilicate packed, shipped, and exported?
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Tetraethyl orthosilicate is shipped as a UN 1292 (3/PGIII) hazardous material, in accordance with international shipping regulations. TSS exports fine chemicals globally.
How can I request a quote or sample of Tetraethyl orthosilicate?
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To request a quote or sample, please contact the TSS sales department through our website or by phone, providing your specific requirements.
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