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- Chemical Name: Tetraethyl orthosilicate
- CAS No.: 78-10-4
- Molecular Fomula: ：C8H20O4Si
- Molecular weight：208.33
- Appearance:Colorless liquid
- Sample：Available
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Description of Silane
- Tetraethyl orthosilicate is the chemical compound with the formula Si(OC2H5)4. Often abbreviated TEOS, it is a colorless liquid that degrades in water. TEOS is the ethyl ether of orthosilicic acid, Si(OH)4. It is a prototypical alkoxide.
TEOS is a tetrahedral molecule. Like its many analogues, TEOS is prepared by alcoholysis of silicon tetrachloride:; SiCl4 + 4 EtOH → Si(OEt)4 + 4 HCl; where Et = C2H5.
Basic Info of Silane
Basic Info
Numbering system
Properties
Safety Info
Basic Info
| Chemical Name | Tetraethyl orthosilicate |
| Synonyms | ethyl orthosilicate;Silicic acid (H4SiO4), tetraethyl ester;tetraethyl ortosilicate;Silester;tetra-ethyl orthosilicate;Expand |
| CAS No. | 78-10-4 |
| Molecular Formula | C8H20O4Si |
| Molecular Weight | 208.32700 |
| PSA | 36.92000 |
| LogP | 1.56800 |
Numbering system
| UNII | 42064KRE49 |
Properties
| Appearance & Physical State | clear colorless liquid with a faint odor |
| Density | 0.934 |
| Boiling Point | 166-169ºC |
| Melting Point | -77ºC |
| Freezing Point | -77℃ |
| Flash Point | 45ºC |
| Refractive Index | n20/D 1.382(lit.) |
| Water Solubility | Hydrolysis |
| Stability | Stable. Flammable. Incompatible with strong oxidizing agents, water, alkalies, mineral acids. |
| Storage Condition | Flammables area |
| Vapor Density | 7.2 (vs air) |
| Vapor Pressure | <1 mm Hg ( 20 °C) |
Safety Info
| RTECS | VV9450000 |
| Hazard Class | 3 |
| Safety Statements | 16-36/37/39 |
| HS Code | 2920909090 |
| Packing Group | III |
| WGK Germany | 1 |
| RIDADR | UN 1292 3/PG 3 |
| Risk Statements | R10; R20; R36/37 |
| Hazard Codes | Xn |
| Hazard Declaration | H226; H319; H332; H335 |
| Symbol | GHS02, GHS07 |
| Signal Word | Warning |
| Caution Statement | P210; P261; P280; P304 + P340 + P312; P337 + P313; P403 + P235 |
What is Tetraethyl orthosilicate ?
- With the progress of science and technology and the development of society, chemical products have invariably permeated our daily lives, in medicine, food, cosmetics, electronics, industry, and other areas, becoming an essential part of our lives. One such product is Tetraethyl orthosilicate which has developed particularly rapidly in recent years. Do you know about Tetraethyl orthosilicate?
- The official answer：Colorless and flammable liquid with an irritating odor. Insoluble in water, soluble in ethanol, slightly soluble in benzene. Ethyl silicate is also known as tetraethyl silicate and tetraethoxysilane. Colorless transparent liquid with a special odor. Stable in the presence of anhydrous decomposes into ethanol and silicic acid in the presence of water, becomes turbid in humid air, soluble in alcohols, ethers, and other organic solvents. Toxic, strongly irritating to human eyes and respiratory tract. It is produced by distillation after the action of silicon tetrachloride and anhydrous ethanol.
What’s the application of Tetraethyl orthosilicate ?
- Ethyl silicate (TEOS) is a colorless liquid, mainly used as a heat-proof coating, chemically resistant coating, silane coupling agent, intermediate of organic synthesis, and precursor of chemical vapor deposition (CVD) SiO2 film in the semiconductor field, etc. The melting point of ethyl silicate is -77℃, boiling point 165.5℃, slightly soluble in water, soluble in ethanol and ether. It is mainly used in chemical resistant coatings and heat resistant coatings, silicone solvents, and precision binders. After complete hydrolysis, it produces very fine silicon oxide powder, which is used to manufacture phosphor and also used as a chemical reagent. ApplicationsTetraethoxysilane is mainly used in optical glass, chemical resistant coatings and heat resistant coatings and adhesives; modification of anticorrosive coatings; cross-linking agent, binder, dehydrating agent; catalyst skeleton, manufacturing of high purity ultra-fine silicaEthyl orthosilicate is mainly used in optical glass, chemical resistant coatings and heat resistant coatings and adhesives; modification of anticorrosive coatings; cross-linking agent, binder, dehydrating agent; catalyst skeleton, manufacturing of high purity ultra-fine silica. Superfine silica manufacturing.
Conclusion
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