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Tetraethyl orthosilicate

Tetraethyl orthosilicate Suppliers list
Tel: 0371-55170695
Products Intro: Product Name:Tetraethyl orthosilicate
Purity:0.99 Package:5KG;1KG;8416KG
Company Name: Hubei Co-Formula Material Tech Co., Ltd.
Tel: +86-27-84459282
Products Intro: Product Name:Tetraethyl orthosilicate;Ethyl Silicate 45;TEOS;Z-6697;AY43-005;ethyl orthosilicate;CFS-104
Purity:min99% Package:500g;USD
Products Intro: Product Name:Tetraethoxysilane (CG-502)
Company Name: Ningxia Jinhua Chemical Co.,Ltd
Tel: 025-52279164
Products Intro: Product Name:Tetraethyl orthosilicate
Purity:99% Package:25Kg/Drum;USD
Company Name: ShenZhen Ipure Biology import and export company co.,ltd
Tel: 18071025641
Products Intro: Product Name:Tetraethyl orthosilicate
Purity:99% Package:500ml

Lastest Price from Tetraethyl orthosilicate manufacturers

  • US $20.00 / Kg/Drum
  • 2021-09-07
  • CAS:78-10-4
  • Min. Order: 25Kg/Drum
  • Purity: 99.99%
  • Supply Ability: 1 ton per week

Related articles

  • What is Tetraethyl orthosilicate?
  • Tetraethyl orthosilicate (TEOS) is the chemical compound with the formula Si(OC2H5)4, and it is a colorless liquid that degrad....
  • Jan 2,2020
Tetraethyl orthosilicate Chemical Properties
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 <1 mm Hg ( 20 °C)
refractive index n20/D 1.382(lit.)
Fp 116 °F
storage temp. Store below +30°C.
solubility Soluble in ethanol and 2-propanol.
form Liquid
Specific Gravity0.934
color Colorless
explosive limit1.3-23%(V)
Water Solubility Hydrolysis
FreezingPoint -77℃
Sensitive Moisture Sensitive
Hydrolytic Sensitivity7: reacts slowly with moisture/water
Merck 14,3851
BRN 1422225
Stability:Stable. Flammable. Incompatible with strong oxidizing agents, water, alkalies, mineral acids.
CAS DataBase Reference78-10-4(CAS DataBase Reference)
NIST Chemistry ReferenceSilicic acid (H4sio4), tetraethyl ester(78-10-4)
EPA Substance Registry SystemTetraethyl silicate (78-10-4)
Safety Information
Hazard Codes Xn
Risk Statements 10-20-36/37-36/37/38
Safety Statements 16-36/37/39-26-24/25
RIDADR UN 1292 3/PG 3
WGK Germany 1
RTECS VV9450000
Autoignition Temperature230 °C
HS Code 2920 90 70
HazardClass 3
PackingGroup III
Hazardous Substances Data78-10-4(Hazardous Substances Data)
ToxicityLD50 orally in Rabbit: 6270 mg/kg LD50 dermal Rabbit 5860 mg/kg
MSDS Information
ACROS English
SigmaAldrich English
ALFA English
Tetraethyl orthosilicate Usage And Synthesis
Ethyl silicateEthyl silicate is also known as Tetraethyl orthosilicate,colorless, transparent liquid with special smell. Stable under the condition of anhydrous, when encountering water, it decomposes into ethanol and silicic acid, cloudy in moist air, soluble in alcohol, ether and other organic solvents. It is toxic, strong irritative to the human eye and respiratory tract. it is prepared by distillation after the reaction of silicon tetrachloride with ethanol. It is used for producing heat and chemical resistant coatings and preparing silicone solvent, can also be used in organic synthesis, the basic raw material for preparing advanced crystal, used as optical glass processing agent, binders, insulation materials for electronics industry, etc.
Ethyl silicate itself is not able to bind, if ethyl silicate is used as refractories binding agents, it must be hydrolyzed before use. TEOS hydrolysis reactions under conditions of water only is very slow, if that is under catalytic action of acid (H +) or base (OH-) catalysis, hydrolysis rate is greatly accelerated. Hydrochloric acid is generally used as a catalyst, as if alkali is as a catalyst, hydrolytic gel will happen soon in hydrolysis solution, leaving the hydrolytic sol destabilized, and thus lose the ability to bind, ethyl silicate hydrolysis under acid catalysis is as follows:

The hydrolysis is essentially the ethoxy (C2H5O-)of ethyl silicate is substituent by hydroxyl (-OH) of water, with the result that ethyl silicate (Si4-OC2H5) converted into a silanol group (Si4-OH). Silanol are highly active, can continue to conduct acid exchange reaction or etherification reaction with other silicic acid ethyl or silanols.
However, the extent of the hydrolysis reaction is carried out by a certain control, to form a stable hydrolyzate of ethyl silicate. Otherwise, the results of continuous reaction will form a body polyorganosiloxane and lose stability, it becomes insoluble gel, thus lose workability. Stability of ethyl silicate hydrolyzate is adjusted mainly by adding acid or base. When the pH is between 1.5 and 2.5, the gel occurs for a longer time, hydrolyzate is most stable. Lower or higher than this range, hydrolysis prone to gel, the pH is 5-6, the hydrolyzate prone to gel and is most unstable. Thus, the general hydrolyzate should be controlled between 2.0 and 2.5, in order to maintain its stability to maintain a certain working time (the time of construction or molding) after mixed with refractory material. Ethyl silicate hydrolyzate can be used as die casting refractory binding agents, also binding agents for clay, high alumina, corundum, containing zircon, mullite, silicon carbide and castable products.
The above information is edited by the chemicalbook of Yan Yanyong.
Chemical PropertiesEthyl silicate is a flammable, colourless liquid with a mild, sweet, alcohol-like odour.  Exposure to ethyl silicate can occur through inhalation, ingestion, and eye or skin contact.  It is practically insoluble in water, soluble in alcohol, and slightly soluble in benzene.
Uses1. Tetraethyl orthosilicate is Used as insulating materials in electronic industry, also used for optical glass processing and used as coagulants.
2. For precision casting, as a sand binder. Metal surface treated by ethyl silicate vapor can be anticorrosion and waterproof. Ethyl silicate can be used to bleed on the metal surface of the silicon, processing optical glass can improve its light transmittance. Fine silica powder produced by complete hydrolysis can be used to manufacture the phosphor. Ethyl silicate is raw material for silicone oil. Ethyl silicate can also be used to manufacture heat-resistant, chemical-resistant coatings. In Japan, 90% of ethyl silicate is used as an anti-corrosion coating (zinc-rich paint) base material.
3. Tetraethyl orthosilicate is Mainly used in chemical-resistant coatings and heat-resistant coatings, used as silicone solvent and precision-made binder. Fine silica powder produced after complete hydrolysis, used for the manufacture of phosphor, also used as a chemical reagent.
4. Tetraethoxysilane is mainly used in optical glass, chemical resistant coatings and heat-resistant coatings and adhesives, modification for anti-corrosion coating, used as crosslinking agent, a binder, a dehydrating agent, used for manufacturing catalyst skeleton, high purity ultrafine silica.
5. Used as Insulating materials in electronic industry, coatings, optical glass treatment agents, coagulants, used for organic synthesis, used as solvents for the preparation of organosilicon.
Production methodIt is produced by esterification of silicon tetrachloride with ethanol at normal temperature and pressure.
CategoryFlammable liquids.
Toxicity gradingPoisoning
Acute toxicityOral-rat LD50: 6270 mg/kg, Inhalation-rat LCL0: 85 g/cubic meter.
Stimulus dataSkin-rabbit 500 mg/24 hours moderate. Eyes-rabbit 500 mg/24 hours mild.
Explosive hazardous characteristicsCan be explosive mixed with air.
Flammability hazard characteristicsCombustible, fire toxic fumes of silicon oxide emissions.
Storage CharacteristicsTreasury ventilation low-temperature drying, stored separately from oxidants.
Extinguishing agentFoam, powder, carbon dioxide, sand.
Occupational standardsTWA 85 mg/m³, STEL 170 mg/m³.
Chemical PropertiesEthyl silicate is a flammable, colourless liquid with a mild, sweet, alcohol-like odour. Exposure to ethyl silicate can occur through inhalation, ingestion, and eye or skin contact. It is practically insoluble in water, soluble in alcohol, and slightly soluble in benzene.
Chemical PropertiesEthyl silicate is a flammable, colorless liquid with a mild, sweet, alcohol-like odor. Exposure to ethyl silicate can occur through inhalation, ingestion, and eye or skin contact. It is practically insoluble in water, soluble in alcohol, and slightly soluble in benzene. Occupational workers are exposed to ethyl silicate at workplaces associated with the manufacture and transportation of ethyl silicate, during use as a bonding agent for industrial buildings and investment castings, ceramic shells, crucibles, refractory bricks, and other molded objects, as a protective coating for heatand chemical-resistant paints, lacquers, and fi lms, in the manufacture of protective and preservative coatings for protection from corrosion (primarily as a binder for zinc dust paints), chemicals, heat, scratches, and fi re. Workers are also exposed to the chemical substance in the production of silicones; as a chemical intermediate in the preparation of soluble silica; as a gelling agent in organic liquids, as a coating agent inside electric lamp bulbs, in the synthesis of fused quartz, and during industrial use in the textile industry in aqueous emulsions, deluster, and fi reproofi ng; as a component of lubricants; as a mold-release agent; and as a heat-resistant adhesive.
Chemical PropertiesEthyl silicate is a colorless, flammable liquid with a sharp odor detectable @ 85 ppm
UsesCommonly used as a precursor to prepare xerogel1,2
UsesTetraethyl Orthosilicate is used in the preparation of antidreflective coatings on silicate glass via silicon dioxide. Crosslinking reagent.
UsesIn weatherproofing and hardening stone, arresting decay and disintegration; manufacture of weatherproof and acidproof mortars and cements. In the "lost wax" process for casting of high-melting alloys.
Production MethodsPrepared from absolute alcohol and silicon tetrachloride.
General DescriptionA clear colorless liquid with a faint odor. Flash point 125°F. Less dense than water. Vapors are heavier than air.
Air & Water ReactionsFlammable. Practically insoluble in water. Reacts slowly with water to form silica and ethyl alcohol [Merck].
Reactivity ProfileTetraethyl orthosilicate reacts exothermically with acids Strong oxidizing acids may cause a reaction that is sufficiently exothermic to ignite the reaction products. May generate with caustic solutions. May generate flammable hydrogen with alkali metals and hydrides.
HazardModerate fire risk. Strong irritant to eyes, nose, throat.
Health HazardExposures to ethyl silicate cause adverse health effects. The symptoms of poisoning include, but are not limited to, irritation of the eye, mucous membrane, respiratory tract, respiratory diffi culty, tremor, fatigue, narcosis, nausea, and vomiting. Prolonged periods of skin contact may produce drying, cracking, infl ammation, and dermatitis. As observed in laboratory animals, occupational workers exposed to the chemical substance may suffer from liver and kidney damage, CNS depression, and anemia. At concentrations of 3000 ppm, ethyl silicate causes extreme and intolerable irritation of the eyes and mucous membranes; at 1200 ppm, it produces tearing of the eyes; at 700 ppm, it causes mild stinging of the eyes and nose; and at 250 ppm, it produces slight irritation of the eyes and nose.
Health HazardInhalation of vapor causes eye and nose irritation, unsteadiness, tremors, salivation, respiratory difficulty, and unconsciousness. Contact with liquid irritates eyes and may cause dryness, cracking, and inflammation of skin. Ingestion may produce nausea, vomiting, and cramps.
Fire HazardHIGHLY FLAMMABLE: Will be easily ignited by heat, sparks or flames. Vapors may form explosive mixtures with air. Vapors may travel to source of ignition and flash back. Most vapors are heavier than air. They will spread along ground and collect in low or confined areas (sewers, basements, tanks). Vapor explosion hazard indoors, outdoors or in sewers. Runoff to sewer may create fire or explosion hazard. Containers may explode when heated. Many liquids are lighter than water.
Safety ProfilePoison by intravenous route. Moderately toxic by other routes. A skin,mucous membrane, and severe eye irritant. Narcotic in high concentrations. Flammable liquid when exposed to heat or flame; can react vigorously with oxidzing materials. When heated to decomposition it emits acrid smoke and fumes. See also ESTERS.
Potential ExposureEthyl silicate is used as a binder in production of cases and molds for investment casting of metals. The next largest application is in corrosion-resistant coatings; primarily as a binder for zinc dust paints. Miscellaneous uses include the protection of white-light bulbs; the preparation of soluble silicas; catalyst preparation and regeneration; and as a crosslinker and intermediate in the production of silicones
ShippingUN1292 Tetraethyl acetate, Hazard Class: 3; Labels: 3-Flammable liquid.
Purification MethodsFractionate it through an 80cm Podbielniak type column (p 11) with a heated jacket and partial take-off head. It is slowly decomposed by H2O-and is soluble in EtOH. It is flammable-it irritates the eyes and mucous membranes. [Sumrell & Ham J Am Chem Soc 78 5573 1956, Bradley et al. J Chem Soc 5020 1952, Beilstein 1 IV 1360.]
IncompatibilitiesMay form explosive mixture with air. Strong oxidizers; strong acids; water.
Waste DisposalIncineration in admixture with a more flammable solvent.
PrecautionsOccupational workers should avoid contact between ethyl silicate and strong oxidizers, water, mineral acids, and alkalis. Workers should use appropriate personal protective clothing and equipment that must be carefully selected, used, and maintained to be effective in preventing skin contact with ethyl silicate. The selection of the appropriate personal protective equipment (PPE) (e.g., gloves, sleeves, encapsulating suits) should be based on the extent of the worker’s potential exposure to ethyl silicate. There are no published reports on the resistance of various materials to permeation by ethyl silicate.
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