Tetraethyl orthosilicate
ALDRICH/131903 - reagent grade, 98%
Synonym: Orthosilicic acid tetraethyl ester; Silicon tetraethoxide; TEOS; Tetraethoxysilane; Tetraethoxysilicon(IV); Tetraethyl silicate; Orthosilicic acid tetraethyl ester; TEOS; Tetraethoxysilane
CAS Number: 78-10-4
Empirical Formula (Hill Notation): C8H20O4Si
Molecular Weight: 208.33
EC Number: 201-083-8
MDL Number: MFCD00009062
Linear Formula: Si(OC2H5)4
Product Type: Chemical
This picture is provided solely for illustration purposes. Optical properties of the actual product may deviate. Relevant product information is printed on labeled products and other accompanying or available information material. This image depicts SKU: 131903-1L.
This picture is provided solely for illustration purposes. Optical properties of the actual product may deviate. Relevant product information is printed on labeled products and other accompanying or available information material. This image depicts SKU: 131903-500ML.
| assay | 98% |
| bp | 168 °C (lit.) |
| density | 0.933 g/mL at 20 °C (lit.) |
| form | liquid |
| grade | reagent grade |
| InChI | 1S/C8H20O4Si/c1-5-9-13(10 |
| InChI key | BOTDANWDWHJENH-UHFFFAOYSA |
| Quality Level | 200  |
| refractive index | n |
| SMILES string | CCO[Si](OCC)(OCC)OCC |
| vapor density | 7.2 (vs air) |
| vapor pressure | <1 mmHg ( 20 °C) |
| Application: | Commonly used as a precursor to prepare xerogel |
| Application: | Tetraethyl orthosilicate can be used: • As a sol-gel precursor to synthesize SiO2-TiO2 anti-reflective self-cleaning coatings for solar cells. • To fabricate nano silica functionalized crosslinked hybrid membranes for proton exchange membrane fuel cell applications. These membranes have better proton conductivity and thermal stability. • To prepare poly(vinylidene fluoride)/TEOS matrix separator to enhance the performance of Li-ion batteries. The separator exhibits excellent electrolyte retention and wettability. • An anti-solvent to fabricate an efficient perovskite layer for inverted planar solar cells with enhanced power conversion efficiency and reproducibility. TEOS helps to achieve high-quality perovskite films with reduced density of defects, and thus slower carrier recombination. • As a precursor to prepare the xerogel. |
| Application: | Will interact with dodecylamine in the formation of intercalation compounds of H+-magadiite and used in a study of mixed-metal bioactive glasses. |
| Features and Benefits: | • Excellent adhesion on substrates • Uniform film deposition • Cross-linker to introduce polymer strands into hydrogel |
| General description: | Tetraethyl orthosilicate (TEOS) is a high-purity (98%) colorless liquid silicon alkoxide widely used as a moisture-sensitive precursor to silicon dioxide (SiO₂). Through sol–gel hydrolysis and condensation, TEOS enables the formation of silica-based networks, aerogels, thin films, nanoparticles, and mesoporous structures. Its controlled reactivity and compatibility with catalysts and templating agents make it valuable in the chemical crosslinking of polymers and the fabrication of advanced materials for coatings, catalysis, hydrogels, biomedical devices, and nanoparticle-based drug delivery systems. |
| Packaging: | 1, 2.5, 4 L in glass bottle |
| Packaging: | 25, 250, 500 mL in glass bottle |
| Symbol |   GHS02,GHS07 |
| Signal word | Warning |
| Hazard statements | H226 - H319 - H332 - H335 |
| Precautionary statements | P210 - P233 - P240 - P241 - P304 + P340 + P312 - P305 + P351 + P338 |
| Hazard Codes | Xn |
| Risk Statements | 10-20-36/37 |
| RIDADR | UN1292 - class 3 - PG 3 - Tetraethyl silicate |
| WGK Germany | WGK 1 |
| Flash Point(F) | 113.0 °F - closed cup |
| Flash Point(C) | 45 °C - closed cup |
| Purity | 98% |
| bp | 168 °C (lit.) |
| Density | 0.933 g/mL at 20 °C (lit.) |
| Refractive Index | n |
| UNSPSC | 12352103 |