tetraethyl silicate ethyl silicate
Tetraethyl orthosilicate
CAS: 78-10-4;1109-96-2;11099-06-2
Molecular Formula: C8H20O4Si
tetraethyl silicate ethyl silicate - Names and Identifiers
tetraethyl silicate ethyl silicate - Physico-chemical Properties
| Molecular Formula | C8H20O4Si |
| Molar Mass | 208.33 |
| Density | 0.933 g/mL at 20 °C(lit.) |
| Melting Point | -77 °C |
| Boling Point | 168°C(lit.) |
| Flash Point | 116°F |
| Water Solubility | Hydrolysis |
| Solubility | Soluble in ethanol and 2-propanol. |
| Vapor Presure | <1 mm Hg ( 20 °C) |
| Vapor Density | 7.2 (vs air) |
| Appearance | Liquid |
| Specific Gravity | 0.934 |
| Color | Colorless |
| Exposure Limit | ACGIH: TWA 10 ppmOSHA: TWA 100 ppm(850 mg/m3)NIOSH: IDLH 700 ppm; TWA 10 ppm(85 mg/m3) |
| Merck | 14,3851 |
| BRN | 1422225 |
| Storage Condition | Store below +30°C. |
| Stability | Stable. Flammable. Incompatible with strong oxidizing agents, water, alkalies, mineral acids. |
| Sensitive | Moisture Sensitive |
| Explosive Limit | 1.3-23%(V) |
| Refractive Index | n20/D 1.382(lit.) |
| Physical and Chemical Properties | Colorless flammable liquid with pungent odor. melting point 110 ℃ boiling point 168.1 ℃ freezing point -77 ℃ relative density 0.9356 flash point 51.67 ℃ solubility insoluble in water, soluble in ethanol, benzene-soluble. |
| Use | Mainly used in optical glass, chemical resistant coatings and heat resistant coatings and adhesives; Anti-corrosion coating modification; Crosslinking agent, binder, dehydrating agent; Catalyst skeleton, high purity ultrafine silica manufacturing. |
tetraethyl silicate ethyl silicate - Risk and Safety
| Hazard Symbols | Xn - Harmful |
| Risk Codes | R10 - Flammable R20 - Harmful by inhalation R36/37 - Irritating to eyes and respiratory system. R36/37/38 - Irritating to eyes, respiratory system and skin. |
| Safety Description | S16 - Keep away from sources of ignition. S36/37/39 - Wear suitable protective clothing, gloves and eye/face protection. S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S24/25 - Avoid contact with skin and eyes. |
| UN IDs | UN 1292 3/PG 3 |
| WGK Germany | 1 |
| RTECS | VV9450000 |
| TSCA | Yes |
| HS Code | 2920 90 70 |
| Hazard Class | 3 |
| Packing Group | III |
| Toxicity | LD50 orally in Rabbit: 6270 mg/kg LD50 dermal Rabbit 5860 mg/kg |
tetraethyl silicate ethyl silicate - Use
- ethyl silicate (TEOS) is a colorless liquid, which is mainly used as heat-resistant coating, chemical-resistant coating, silane coupling agent, organic synthesis intermediate and precursor of chemical vapor deposition (CVD)SiO2 thin film in semiconductor field. Ethyl silicate has a melting point of -77 ℃ and a boiling point of 165.5 ℃. It is slightly soluble in water, soluble in ethanol and ether.
- The electronics industry is used as an insulating material, and also as an optical glass processing and coagulant
- Used for precision casting as a binder for sand molds; metal surfaces treated with ethyl silicate vapor can be anticorrosive and waterproof. Ethyl silicate can be used to siliconize metal surfaces, and processing optical glass can improve the transmittance; the extremely fine silica powder produced after complete hydrolysis can be used to make phosphors. Ethyl silicate is the raw material of silicone oil. Ethyl silicate can also be used to make heat-resistant and chemical-resistant coatings. In Japan, 90% ethyl silicate is used as the base material for anti-corrosion coatings (zinc-rich paint).
- is mainly used for chemical-resistant coatings and heat-resistant coatings, silicone solvents and precision binders. After complete hydrolysis, extremely fine silica powder is produced, which is used to make phosphors and can also be used as chemical reagents.
- tetraethoxysilane is mainly used for optical glass, chemical-resistant coatings, heat-resistant coatings and adhesives; modification of anticorrosive coatings; crosslinking agents, binders, dehydrating agents; catalyst skeleton, high-purity ultra-fine Silica manufacturing
- Ethyl orthosilicate is mainly used for optical glass, chemical-resistant coatings and heat-resistant coatings and adhesives; modification of anticorrosive coatings; crosslinking agents, binders, dehydrating agents; catalyst skeleton, high purity The manufacture of ultra-fine silica.
- Insulating materials for the electronics industry, coatings, optical glass treatment agents, coagulants, organic synthesis, solvents for preparing silicone
- In the intercalation compound forming H-magadiite, it will react with diamine to study mixed metal bioactive glass. Commonly used as a precursor for the preparation of xerogels
Last Update：2024-04-10 22:29:15
tetraethyl silicate ethyl silicate - Reference Information
| freezing point | -77 ℃ |
| NIST chemical information | information provided by: webbook.nist.gov (external link) |
| EPA chemical substance information | information provided by: ofmpeb.epa.gov (external link) |
| Introduction | ethyl silicate, also known as tetraethyl silicate, tetraethoxysilane. Colorless transparent liquid, with special odor. Stable in the presence of anhydrous, water decomposition into ethanol and silicic acid, turbid in humid air, soluble in alcohol, ether and other organic solvents. Toxic, strong irritation to the human eye and respiratory tract. Obtained by distillation after the action of silicon tetrachloride and anhydrous ethanol. It is used in the preparation of heat-resistant and chemical-resistant coatings and organic silicon solvents. It can also be used in organic synthesis, basic raw materials for the preparation of advanced Crystal, optical glass treatment agents, bonding agents, insulating materials for the electronics industry, etc. |
| refractory material principle | ethyl silicate itself has no binding capacity, if ethyl silicate is used as a binder for refractory materials, must be hydrolyzed before use. The hydrolysis reaction of ethyl silicate proceeds very slowly under the condition of only water, and the hydrolysis rate is greatly accelerated once it is catalyzed by acid (H) or base (OH-). Hydrochloric acid is generally used as a catalyst, because the use of alkali as a catalyst will make the hydrolysis solution quickly gel and the hydrolysis Sol lose stability, thus losing the binding ability, ethyl silicate in the acid catalyzed hydrolysis reaction is as follows: The hydrolysis reaction is essentially the replacement of the ethoxy group (C2H5O-) in the ethyl silicate by the hydroxyl group (-OH) in water, resulting in the conversion from the ethyl silicate (Si4-OC2H5) to the silanol group (Si4-OH). Silanol groups are highly reactive and can continue to undergo acid exchange or etherification reactions with other ethyl silicates or silanol groups. However, the degree of hydrolysis reaction must be controlled to produce stable ethyl silicate hydrolysate. Otherwise, as a result of the continuous reaction, the body-type polyorganosilicon will be formed to lose stability and become an insoluble gel, thereby losing workability. The stability of ethyl silicate hydrolysate is mainly adjusted by the addition of acid or alkali. When the pH value is between 1.5 and 2.5, the gel time is longer, and the hydrolysate is the most stable, lower than or higher than this range. The hydrolysate is prone to gel, and the pH value is between 5 and 6, The hydrolysate is the most unstable. Therefore, the general hydrolysis liquid should be controlled between 2.0~2.5, in order to maintain its stability, in order to maintain a certain operation time (construction or forming time) after mixing with refractory materials. The hydrolysis solution of ethyl silicate can be used as a binder for refractory materials of precision casting mold, and can also be used as a binder for products such as clay, high alumina, corundum, zircon, mullite, silicon carbide and castables. |
| Application | ethyl silicate (TEOS) is a colorless liquid, mainly used as heat-proof coating, chemical-resistant coating, silane coupling agents, organic synthesis intermediates, and precursors of chemical vapor deposition (CVD)SiO2 thin films in the semiconductor field. Ethyl silicate has a melting point of -77 °c and a boiling point of 165.5 °c. It is slightly soluble in water and soluble in ethanol and ether. The electronic industry is used as an insulating material, and is also used as an optical glass treatment and coagulant for precision casting, as a binder for sand mold; The metal surface treated with ethyl silicate vapor can be anticorrosive and waterproof. Ethyl silicate can be used to infiltrate silicon on the metal surface, and the optical glass can be treated to improve the transmittance. The extremely fine silicon oxide powder produced after complete hydrolysis can be used to manufacture the fluorescent powder. Ethyl silicate is the raw material of organic silicone oil. Ethyl silicate can also be used in the manufacture of heat-resistant, chemical-resistant coatings. In Japan, 90% of ethyl silicate is used as a binder for anti-corrosion coatings (zinc-rich paints). mainly used in chemical-resistant coatings and heat-resistant coatings, organic silicon solvents and precision adhesives. After complete hydrolysis to produce very fine silicon oxide powder, used in the production of fluorescent powder, can also be used as a chemical reagent. tetraethoxysilane is mainly used for optical glass, chemical-resistant coatings, heat-resistant coatings and adhesives; Modification of anti-corrosion coatings; Crosslinking agent, binder, dehydrating agent; Catalyst skeleton, manufacture of high-purity ultrafine silica tetraethyl orthosilicate is mainly used for optical glass, chemical-resistant coatings, heat-resistant coatings and adhesives; Modification of anti-corrosion coatings; Crosslinking agents, binders, dehydrating agents; Catalyst framework, fabrication of high-purity ultrafine silica. insulating materials for electronic industry, Coatings, optical glass treatment agents, coagulants, organic synthesis, solvents for the preparation of silicones In the intercalation compounds forming H +-magadiite, for the study of mixed metal bioactive glass. Commonly used as a precursor in the preparation of xerogels |
| production method | is obtained by esterification of silicon tetrachloride and ethanol at normal temperature and pressure. |
| category | flammable liquid |
| toxicity grade | poisoning |
| Acute toxicity | oral-rat LD50: 6270 mg/kg; Inhalation-rat LCL0: 85g/m3 |
| stimulation data | Skin-rabbits 500 mg/24 h moderate; eye-rabbit 500 mg/24 h mild |
| explosive hazard characteristics | explosive when mixed with air |
| flammability hazard characteristics | flammable; Toxic silica fume emitted from fire scene |
| storage and transportation characteristics | The warehouse is ventilated and dried at low temperature; Storage and transportation is separated from oxidant |
| fire extinguishing agent | foam, dry powder, carbon dioxide, sand |
| Occupational Standard | TWA 85 mg/m3; Tel 170 mg/m3 |
| spontaneous combustion temperature | 230°C |
| toxic substance data | information provided by: pubchem.ncbi.nlm.nih.gov (external link) |
| immediate life-and health-threatening concentration | 700 ppm |
Last Update：2024-04-10 22:29:15
tetraethyl silicate ethyl silicate - Nature
| melting point | -77 °C |
| boiling point | 168 °C(lit.) |
| density | 0.933 g/mL at 20 °C(lit.) |
| vapor density | 7.2 (vs air) |
| Vapor pressure | <1mm Hg ( 20 °C) |
| refractive index | n20/D 1.382(lit.) |
| flash point | 116 °F |
| storage conditions | Store below +30°C. |
| solubility | Soluble in ethanol and 2-propanol. |
| morphology | Liquid |
| Specific gravity | 0.934 |
| color | Colorless |
| explosion limit value (explosive limit) | 1.3-23%(V) |
| water solubility | Hydrolysis |
| freezing point | -77℃ |
| hydrolysis sensitivity | 7: reacts slowly with moisture/water |
| sensitivity | Moisture Sensitive |
| Merck | 14,3851 |
| BRN | 1422225 |
| stability | Stable. Flammable. Incompatible with strong oxidizing agents, water, alkalies, mineral acids. |
| InChIKey | BOTDANWDWHJENH-UHFFFAOYSA-N |
| NIST chemical information | Silicic acid (H4sio4), tetraethyl ester(78-10-4) |
| EPA chemical information | Tetraethyl silicate (78-10-4) |
Last Update：2024-04-10 22:29:15
tetraethyl silicate ethyl silicate - Security information
Open Data Unverified Data
| dangerous goods mark | Xn |
| hazard category code | 10-20-36/37-36/37/38 |
| safety instructions | 16-36/37/39-26-24/25 |
| dangerous goods transport number | UN 1292 3/PG 3 |
| WGK Germany | 1 |
| RTECS number | VV9450000 |
| auto-ignition temperature | 230 °C |
| TSCA | Yes |
| customs code | 2920 90 70 |
| HazardClass | 3 |
| PackingGroup | III |
| toxic substance data | 78-10-4(Hazardous Substances Data) |
| Toxicity | LD50 orally in Rabbit: 6270 mg/kg LD50 dermal Rabbit 5860 mg/kg |
Last Update：2024-04-12 11:42:30
tetraethyl silicate ethyl silicate - Nature
Open Data Unverified Data
colorless flammable liquid with pungent smell. Insoluble in water, soluble in ethanol, slightly soluble in benzene.
Last Update：2024-04-12 11:42:15
tetraethyl silicate ethyl silicate - Security information
Open Data Unverified Data
| production method | It is obtained by esterification of silicon tetrachloride and ethanol at room temperature and pressure. |
| category | flammable liquid |
| toxicity classification | Poisoning |
| acute toxicity | oral-rat LD50: 6270 mg/kg; Inhalation-rat LCL0: 85g/m3 |
| Stimulus data | skin-rabbit 500 mg/24 hours moderate; Eyes-rabbit 500 mg/24 hours mild |
| explosive hazard characteristics | Blowable with air |
| flammability hazard characteristics | Flammable; toxic silicon oxide fumes emitted from fire sites |
| storage and transportation characteristics | The warehouse is ventilated and dry at low temperature; it is stored and transported separately from the oxidant |
| fire extinguishing agent | foam, dry powder, carbon dioxide, sand |
| occupational standards | TWA 85 mg/m3; STEL 170 mg/m3 |
Last Update：2024-04-12 11:42:02
tetraethyl silicate ethyl silicate - Introduction
Ethyl silicate is also known as tetraethyl silicate and tetraethoxysilane. Colorless transparent liquid with special odor. It is stable in the presence of no water, decomposes into ethanol and silicic acid in water, becomes turbid in humid air, and is soluble in organic solvents such as alcohol and ether. Toxic, strong irritation to human eyes and respiratory tract. It is prepared by distillation after the action of silicon tetrachloride and absolute ethanol. It is used to make heat-resistant and chemical-resistant coatings and silicone solvents. It can also be used for organic synthesis, basic raw materials for preparing advanced crystals, optical glass treatment agents, binders, insulating materials for the electronic industry, etc.
Last Update：2024-04-09 01:59:49
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