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Tetramethyl orthosilicate

Description
Tetramethyl orthosilicate
Tetramethyl orthosilicate structure
CAS No.
681-84-5
Chemical Name:
Tetramethyl orthosilicate
Synonyms
TMOS;tl190;TL 190;CFS-845;Dynasil M;(CH3)4SiO4;METHYLSILICATE;SILICATE,METHYL;TetramethoxysiL;O-METHYLSILICATE
CBNumber:
CB6177258
Molecular Formula:
C4H12O4Si
Formula Weight:
152.22
MOL File:
681-84-5.mol

Tetramethyl orthosilicate Properties

Melting point:
−4 °C(lit.)
Boiling point:
121-122 °C(lit.)
Density 
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.)
FEMA 
3185 | METHYLATED SILICA
Flash point:
84 °F
storage temp. 
Store below +30°C.
form 
liquid
Specific Gravity
1.032
color 
colorless
explosive limit
0.88-23.8%(V)
Water Solubility 
hydrolysis
Sensitive 
Moisture Sensitive
Hydrolytic Sensitivity
7: reacts slowly with moisture/water
BRN 
1699658
InChIKey
LFQCEHFDDXELDD-UHFFFAOYSA-N
CAS DataBase Reference
681-84-5(CAS DataBase Reference)
EWG's Food Scores
1
FDA UNII
19D35VPL66
NIST Chemistry Reference
Tetramethyl silicate(681-84-5)
EPA Substance Registry System
Tetramethyl silicate (681-84-5)
SAFETY
  • Risk and Safety Statements
Symbol(GHS) 
GHS02,GHS05,GHS06
Signal word  Danger
Hazard statements  H335-H226-H315-H318-H330
Precautionary statements  P303+P361+P353-P304+P340-P305+P351+P338-P320-P405-P501a-P210-P260-P280-P304+P340+P310-P305+P351+P338+P310-P370+P378
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
10-21
Autoignition Temperature 245 °C
TSCA  Yes
HazardClass  6.1
PackingGroup  I
HS Code  29209085
NFPA 704
3
3 1

Tetramethyl orthosilicate price More Price(15)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich 8.14651 Tetramethyl orthosilicate for synthesis 681-84-5 25 mL $39.59 2021-12-16 Buy
Sigma-Aldrich 218472 Tetramethyl orthosilicate 98% 681-84-5 100g $89.4 2021-12-16 Buy
Sigma-Aldrich 218472 Tetramethyl orthosilicate 98% 681-84-5 500g $154 2021-12-16 Buy
Alfa Aesar L09716 Tetramethoxysilane 98% 681-84-5 100g $69.3 2021-12-16 Buy
Alfa Aesar L09716 Tetramethoxysilane 98% 681-84-5 25g $24.6 2021-12-16 Buy

Tetramethyl orthosilicate Chemical Properties,Uses,Production

Description

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.

Applications:

Chemical Properties

Methyl silicate is a liquid.

Chemical Properties

Colorless transparent liquid

Uses

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

Uses

Coating screens of television picture tubes; mold binders; corrosion-resistant coatings; catalyst preparation; silicone intermediate

Uses

Tetramethyl Orthosilicate is a compound used in the research of the multifunctionality of silicified nanoshells and the efficiency at adsorbing cadmium ions at cell interfaces.

Production Methods

Silica aerogels are usually prepared by base-catalyzed reaction of tetramethoxysilane or tetraethoxysilane, mostly with ammonia as the catalyst. A modification of this procedure is to prehydrolyze Si(OR)4 with a small amount of water under acidic conditions.

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 .

Hazard

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.

Shipping

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.]

Incompatibilities

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( 256)Suppliers
Supplier Tel Fax Email Country ProdList Advantage
Hubei Co-Formula Material Tech Co., Ltd.
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View Lastest Price from Tetramethyl orthosilicate manufacturers

Image Release date Product Price Min. Order Purity Supply Ability Manufacturer
2022-01-20 Tetramethyl orthosilicate
681-84-5
US $10.00 / KG/Tin 1KG 99% 5000tons per month Wuhan Mulei New Material Technology Co. Ltd
2021-12-01 Tetramethyl orthosilicate
681-84-5
US $1.70 / Kg/Drum 10g 99% 10000kg Hebei Crovell Biotech Co Ltd
2020-09-19 Tetramethyl orthosilicate
681-84-5
US $15.00 / ASSAYS 1ASSAYS 99% 500 Ton/Tons per Month Hebei Runbin Biotechnology Co. LTD

Tetramethyl orthosilicate Spectrum


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