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Tetraethyl orthosilicate

Ethyl silicate Chemical Properties Uses Production method Category Toxicity grading Acute toxicity Stimulus data Explosive hazardous characteristics Flammability hazard characteristics Storage Characteristics Extinguishing agent Occupational standards
Tetraethyl orthosilicate
Tetraethyl orthosilicate structure
Chemical Name:
Tetraethyl orthosilicate
es28;TEOS;es100;78-10-4;Silester;silikanl;dynasila;Dynasil A;(C2H5O)4Si;(C2H5)4SiO4
Molecular Formula:
Formula Weight:
MOL File:

Tetraethyl orthosilicate Properties

Melting point:
-77 °C
Boiling point:
168 °C(lit.)
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.)
Flash point:
116 °F
storage temp. 
Flammables area
Soluble in ethanol and 2-propanol.
Specific Gravity
explosive limit
Water Solubility 
Moisture Sensitive
Stable. Flammable. Incompatible with strong oxidizing agents, water, alkalies, mineral acids.
CAS DataBase Reference
78-10-4(CAS DataBase Reference)
NIST Chemistry Reference
Silicic acid (H4sio4), tetraethyl ester(78-10-4)
EPA Substance Registry System
Silicic acid (H4SiO4), tetraethyl ester(78-10-4)
  • Risk and Safety Statements
  • Hazard and Precautionary Statements (GHS)
  • NFPA
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 Temperature 230 °C
HS Code  2920 90 70
HazardClass  3
PackingGroup  III
Hazardous Substances Data 78-10-4(Hazardous Substances Data)
Toxicity LD50 orally in Rabbit: 6270 mg/kg LD50 dermal Rabbit 5860 mg/kg
Signal word: Warning
Hazard statements:
Code Hazard statements Hazard class Category Signal word Pictogram P-Codes
H226 Flammable liquid and vapour Flammable liquids Category 3 Warning
H315 Causes skin irritation Skin corrosion/irritation Category 2 Warning P264, P280, P302+P352, P321,P332+P313, P362
H318 Causes serious eye damage Serious eye damage/eye irritation Category 1 Danger P280, P305+P351+P338, P310
H319 Causes serious eye irritation Serious eye damage/eye irritation Category 2A Warning P264, P280, P305+P351+P338,P337+P313P
H332 Harmful if inhaled Acute toxicity,inhalation Category 4 Warning P261, P271, P304+P340, P312
H335 May cause respiratory irritation Specific target organ toxicity, single exposure;Respiratory tract irritation Category 3 Warning
H370 Causes damage to organs Specific target organ toxicity, single exposure Category 1 Danger P260, P264, P270, P307+P311, P321,P405, P501
H373 May cause damage to organs through prolonged or repeated exposure Specific target organ toxicity, repeated exposure Category 2 Warning P260, P314, P501
Precautionary statements:
P210 Keep away from heat/sparks/open flames/hot surfaces. — No smoking.
P233 Keep container tightly closed.
P240 Ground/bond container and receiving equipment.
P260 Do not breathe dust/fume/gas/mist/vapours/spray.
P261 Avoid breathing dust/fume/gas/mist/vapours/spray.
P264 Wash hands thoroughly after handling.
P264 Wash skin thouroughly after handling.
P270 Do not eat, drink or smoke when using this product.
P271 Use only outdoors or in a well-ventilated area.
P280 Wear protective gloves/protective clothing/eye protection/face protection.
P303+P361+P353 IF ON SKIN (or hair): Remove/Take off Immediately all contaminated clothing. Rinse SKIN with water/shower.
P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.
P307+P311 IF exposed: call a POISON CENTER or doctor/physician.
P337+P313 IF eye irritation persists: Get medical advice/attention.
P370+P378 In case of fire: Use … for extinction.
P405 Store locked up.
P403+P233 Store in a well-ventilated place. Keep container tightly closed.
P403+P235 Store in a well-ventilated place. Keep cool.
P501 Dispose of contents/container to..…

NFPA 704

Diamond Hazard Value Description
Flammability   2 Must be moderately heated or exposed to relatively high ambient temperature before ignition can occur and multiple finely divided suspended solids that do not require heating before ignition can occur. Flash point between 37.8 and 93.3 °C (100 and 200 °F). (e.g. diesel fuel, sulfur)
Instability   0 Normally stable, even under fire exposure conditions, and is not reactive with water (e.g. helium,N2)

(NFPA, 2010)

Tetraethyl orthosilicate price More Price(29)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich 131903 Tetraethyl orthosilicate reagent grade, 98% 78-10-4 1l $60.8 2018-11-13 Buy
Sigma-Aldrich 131903 Tetraethyl orthosilicate reagent grade, 98% 78-10-4 4l $215 2018-11-13 Buy
TCI Chemical T0100 Tetraethyl Orthosilicate >97.0%(GC) 78-10-4 25mL $16 2018-11-22 Buy
TCI Chemical T0100 Tetraethyl Orthosilicate >97.0%(GC) 78-10-4 500mL $29 2018-11-22 Buy
Alfa Aesar A14965 Tetraethoxysilane, 98% 78-10-4 100ml $20 2018-11-13 Buy

Tetraethyl orthosilicate Chemical Properties,Uses,Production

Ethyl silicate

Ethyl 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 Properties

Ethyl 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.


1. 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 method

It is produced by esterification of silicon tetrachloride with ethanol at normal temperature and pressure.


Flammable liquids.

Toxicity grading


Acute toxicity

Oral-rat LD50: 6270 mg/kg, Inhalation-rat LCL0: 85 g/cubic meter.

Stimulus data

Skin-rabbit 500 mg/24 hours moderate. Eyes-rabbit 500 mg/24 hours mild.

Explosive hazardous characteristics

Can be explosive mixed with air.

Flammability hazard characteristics

Combustible, fire toxic fumes of silicon oxide emissions.

Storage Characteristics

Treasury ventilation low-temperature drying, stored separately from oxidants.

Extinguishing agent

Foam, powder, carbon dioxide, sand.

Occupational standards

TWA 85 mg/m³, STEL 170 mg/m³.

Chemical Properties

Ethyl 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 Properties

Ethyl 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 Properties

Ethyl silicate is a colorless, flammable liquid with a sharp odor detectable @ 85 ppm


Commonly used as a precursor to prepare xerogel1,2


Tetraethyl Orthosilicate is used in the preparation of antidreflective coatings on silicate glass via silicon dioxide. Crosslinking reagent.


In 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.

General Description

A clear colorless liquid with a faint odor. Flash point 125°F. Less dense than water. Vapors are heavier than air.

Air & Water Reactions

Flammable. Practically insoluble in water. Reacts slowly with water to form silica and ethyl alcohol [Merck].

Reactivity Profile

Tetraethyl 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.


Moderate fire risk. Strong irritant to eyes, nose, throat.

Health Hazard

Exposures 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 Hazard

Inhalation 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 Hazard

HIGHLY 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 Profile

Poison 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 Exposure

Ethyl 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

First aid

If this chemical gets into the eyes, remove any contact lenses at once and irrigate immediately for at least 15 minutes, occasionally lifting upper and lower lids. Seek medical attention immediately. If this chemical contacts the skin, remove contaminated clothing and wash immediately with soap and water. Seek medical attention immediately. If this chemical has been inhaled, remove from exposure, begin rescue breathing (using universal precautions, including resuscitation mask) if breathing has stopped and CPR if heart action has stopped. Transfer promptly to a medical facility. When this chemical has been swallowed, get medical attention. Give large quantities of water and induce vomiting. Do not make an unconscious person vomit. Medical observation is recommended for 24 to 48 hours after breathing overexposure, as pulmonary edema may be delayed. As first aid for pulmonary edema, a doctor or authorized paramedic may consider administering a drug or other inhalation therapy.


UN1292 Tetraethyl acetate, Hazard Class: 3; Labels: 3-Flammable liquid.

Purification Methods

Fractionate 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.]


May form explosive mixture with air. Strong oxidizers; strong acids; water.

Waste Disposal

Incineration in admixture with a more flammable solvent.


Occupational 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.

Tetraethyl orthosilicate Preparation Products And Raw materials

Raw materials

Preparation Products

Tetraethyl orthosilicate Suppliers

Global( 264)Suppliers
Supplier Tel Fax Email Country ProdList Advantage
Henan DaKen Chemical CO.,LTD.
+86-371-55531817 CHINA 22064 58
Henan Tianfu Chemical Co.,Ltd.
0371-55170693 CHINA 20743 55
Shanghai Time Chemicals CO., Ltd.
+86-021-57951555 CHINA 1373 55
Mainchem Co., Ltd.
+86-0592-6210733 CHINA 32606 55
+86 21 5161 9050/ 5187 7795
+86 21 5161 9052/ 5187 7796 CHINA 24212 60
Hefei TNJ Chemical Industry Co.,Ltd.
86-0551-65418684 18949823763
86-0551-65418684 China 1747 55
Xiamen AmoyChem Co., Ltd
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Win-Win Chemical CO., Limited
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Chemwill Asia Co.,Ltd.
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Hubei Jusheng Technology Co.,Ltd.
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View Lastest Price from Tetraethyl orthosilicate manufacturers

Image Release date Product Price Min. Order Purity Supply Ability Manufacturer
2018-08-06 Tetraethyl orthosilicate
US $1.00 / KG 1KG 98% 1 career henan chemical co

Tetraethyl orthosilicate Spectrum

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