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Tetramethyl orthosilicate

Tetramethyl orthosilicate
Tetramethyl orthosilicate structure
Chemical Name:
Tetramethyl orthosilicate
TMOS;tl190;TL 190;Dynasil M;(CH3)4SiO4;METHYLSILICATE;SILICATE,METHYL;O-METHYLSILICATE;Tetramethosysilan;tetramethoxy-silan
Molecular Formula:
Formula Weight:
MOL File:

Tetramethyl orthosilicate Properties

Melting point:
−4 °C(lit.)
Boiling point:
121-122 °C(lit.)
1.023 g/mL at 25 °C(lit.)
vapor density 
5.25 (vs air)
vapor pressure 
3.35 psi ( 20 °C)
refractive index 
n20/D 1.368(lit.)
Flash point:
84 °F
storage temp. 
Flammables area
explosive limit
Water Solubility 
Moisture Sensitive
CAS DataBase Reference
681-84-5(CAS DataBase Reference)
NIST Chemistry Reference
Tetramethyl silicate(681-84-5)
EPA Substance Registry System
Silicic acid (H4SiO4), tetramethyl ester(681-84-5)
  • Risk and Safety Statements
  • Hazard and Precautionary Statements (GHS)
  • NFPA
Hazard Codes  T+
Risk Statements  10-26-37/38-41
Safety Statements  16-26-36/37/39-45-28A
RIDADR  UN 2606 6.1/PG 1
WGK Germany  3
RTECS  VV9800000
Autoignition Temperature 245 °C
HazardClass  6.1
PackingGroup  I
HS Code  29209085
Hazardous Substances Data 681-84-5(Hazardous Substances Data)
Signal word: Danger
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
H330 Fatal if inhaled Acute toxicity,inhalation Category 1, 2 Danger P260, P271, P284, P304+P340, P310,P320, P403+P233, P405, P501
H335 May cause respiratory irritation Specific target organ toxicity, single exposure;Respiratory tract irritation Category 3 Warning
Precautionary statements:
P210 Keep away from heat/sparks/open flames/hot surfaces. — No smoking.
P260 Do not breathe dust/fume/gas/mist/vapours/spray.
P280 Wear protective gloves/protective clothing/eye protection/face protection.
P320 Specific treatment is urgent (see … on this label).
P303+P361+P353 IF ON SKIN (or hair): Remove/Take off Immediately all contaminated clothing. Rinse SKIN with water/shower.
P304+P340 IF INHALED: Remove victim to fresh air and Keep at rest in a position comfortable for breathing.
P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.
P370+P378 In case of fire: Use … for extinction.
P405 Store locked up.

NFPA 704

Diamond Hazard Value Description
3 1
Health   3 Short exposure could cause serious temporary or moderate residual injury (e.g. liquid hydrogen, sulfuric acid, calcium hypochlorite, hexafluorosilicic acid)
Flammability   3 Liquids and solids (including finely divided suspended solids) that can be ignited under almost all ambient temperature conditions . Liquids having a flash point below 22.8 °C (73 °F) and having a boiling point at or above 37.8 °C (100 °F) or having a flash point between 22.8 and 37.8 °C (73 and 100 °F). (e.g. gasoline, acetone)
Instability   1 Normally stable, but can become unstable at elevated temperatures and pressures (e.g. propene)

(NFPA, 2010)

Tetramethyl orthosilicate price More Price(12)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich 218472 Tetramethyl orthosilicate 98% 681-84-5 100g $86.5 2018-11-20 Buy
Sigma-Aldrich 218472 Tetramethyl orthosilicate 98% 681-84-5 500g $148 2018-11-20 Buy
Alfa Aesar L09716 Tetramethoxysilane 98% 681-84-5 100g $62.4 2018-11-20 Buy
Alfa Aesar L09716 Tetramethoxysilane 98% 681-84-5 25g $21.4 2018-11-20 Buy
Strem Chemicals 93-1459 Tetramethoxysilane, 98% 681-84-5 25g $29 2018-11-13 Buy

Tetramethyl orthosilicate Chemical Properties,Uses,Production


Silicon esters are silicon compounds that contain an oxygen bridge from silicon to an organic group, for example, Si-OR. Tetramethoxysilane (TMOS), the methyl ester of orthosilicic acid, is a colorless, low-viscosity liquid. It is industrially the most important of the tetraalkyl silicates.


Chemical Properties

Methyl silicate is a liquid.

Chemical Properties

Colorless transparent liquid


Used in the sol-gel synthesis of chromium-doped silicates1 and in the formation of hexagonal mesoporous silica layers.2

General Description

A clear colorless liquid. Flash point below 125°F. Less dense than water and insoluble in water. Very toxic by ingestion and inhalation and very irritating to skin and eyes. Used to make paints and lacquers.

Air & Water Reactions

Flammable. Insoluble in water.

Reactivity Profile

Tetramethyl orthosilicate is incompatible with the following: Oxidizers; hexafluorides of rhenium, molybdenum & tungsten .


Eye damage and upper respiratory tract irri-tant.

Health Hazard

TOXIC; inhalation, ingestion or contact (skin, eyes) with vapors, dusts or substance may cause severe injury, burns or death. Bromoacetates and chloroacetates are extremely irritating/lachrymators. Reaction with water or moist air will release toxic, corrosive or flammable gases. Reaction with water may generate much heat that will increase the concentration of fumes in the air. Fire will produce irritating, corrosive and/or toxic gases. Runoff from fire control or dilution water may be corrosive and/or toxic and cause pollution.

Fire Hazard

HIGHLY FLAMMABLE: Will be easily ignited by heat, sparks or flames. Vapors form explosive mixtures with air: indoors, outdoors and sewers explosion hazards. Most vapors are heavier than air. They will spread along ground and collect in low or confined areas (sewers, basements, tanks). Vapors may travel to source of ignition and flash back. Substance will react with water (some violently) releasing flammable, toxic or corrosive gases and runoff. Contact with metals may evolve flammable hydrogen gas. Containers may explode when heated or if contaminated with water.

Safety Profile

Poison by intraperitoneal route. Moderately toxic by inhalation. Midly toxic by skin contact. A severe eye irritant. This material can cause extensive necrosis (experimentally), keratoconus, and opaque cornea. It also causes severe human eye injuries, as well as necrosis of corneal cells, which progresses long after exposure has ceased. It is destructive and its effects resist treatment. Permanent blindness is possible from exposure to it. The kidney seems to be most subject to injury regardless of the mode of exposure. Pulmonary edema has also occurred. This material is more toxic than either ethyl silicate or silicic acid, although it has been thought that the injury caused is largely due to the action of the silicic acid. Flammable when exposed to heat or flame; can react vigorously with oxidizing materials. Potentially violent reaction with metal hexafluorides (e.g., rhenium, molybdenum, tungsten). When heated to decomposition it emits acrid smoke and irritating fumes.

Potential Exposure

Methyl silicate is used in coating screens of television picture tubes. It may be used in mold binders and in corrosion-resistant coatings; as well as in catalyst preparation and as a silicone intermediate.

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.


UN2606 Methyl orthosilicate, Hazard class: 6.1; Labels: 6.1-Poisonous materials, 3-Flammable liquid.

Purification Methods

Purification is as for tetraethoxysilane. It has a vapour pressure of 2.5mm at 0o. [IR: Sternbach & MacDiarmid J Am Chem Soc 81 5109 1959. Beilstein 1 IV 1266.]


Vapor may form explosive mixture with air. Incompatible with oxidizers (chlorates, nitrates, peroxides, permanganates, perchlorates, chlorine, bromine, fluorine, etc.); contact may cause fires or explosions. Keep away from alkaline materials, including alkaline earth metals, metals, strong acids, strong bases; water, moisture, steam decomposes releasing toxic, flammable gases. Violent reaction with metal hexafluorides of rhenium, molybdenum, and tungsten. Contact with metals may evolve flammable hydrogen gas.

Tetramethyl orthosilicate Preparation Products And Raw materials

Raw materials

Preparation Products

Tetramethyl orthosilicate Suppliers

Global( 200)Suppliers
Supplier Tel Fax Email Country ProdList Advantage
Henan DaKen Chemical CO.,LTD.
+86-371-55531817 CHINA 21967 58
Henan Tianfu Chemical Co.,Ltd.
0371-55170693 CHINA 20680 55
Mainchem Co., Ltd.
+86-0592-6210733 CHINA 32457 55
+86 21 5161 9050/ 5187 7795
+86 21 5161 9052/ 5187 7796 CHINA 24196 60
Xiamen AmoyChem Co., Ltd
+86 (0)592-605 1114 CHINA 6374 58
Kingfirst chemical (nanjing) co.,ltd
86-25-84774616 or 1617 CHINA 60 58
Chemwill Asia Co.,Ltd.
86-21-51861608;;; CHINA 24001 58
Hubei Jusheng Technology Co.,Ltd.
86-188-71490254 CHINA 20095 58
Haihang Industry Co.,Ltd
+86 531 8582 1093 CHINA 4669 58
career henan chemical co
+86-371-86658258 CHINA 20104 58

View Lastest Price from Tetramethyl orthosilicate manufacturers

Image Release date Product Price Min. Order Purity Supply Ability Manufacturer
2018-12-16 Tetramethyl orthosilicate
US $7.00 / kg 1kg 99% 100KG career henan chemical co
2018-12-16 Tetramethyl orthosilicate
US $7.00 / kg 1kg 99% 100KG career henan chemical co

Tetramethyl orthosilicate Spectrum

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