Cas no 681-84-5 (Tetramethoxysilane)

Tetramethoxysilane (TMOS) is a silicon-based organic compound with the chemical formula Si(OCH?)?. It is a colorless, volatile liquid widely used as a precursor in sol-gel processes, silica-based materials synthesis, and coatings. TMOS hydrolyzes readily in the presence of water, forming silanol groups that condense to create silica networks, making it valuable for producing high-purity glass, ceramics, and thin films. Its high reactivity and ability to form uniform, dense structures under controlled conditions are key advantages. Additionally, TMOS is employed in adhesives, sealants, and as a crosslinking agent due to its efficient gelation properties. Proper handling is essential due to its flammability and moisture sensitivity.
Tetramethoxysilane structure
Tetramethoxysilane structure
Product Name:Tetramethoxysilane
CAS No:681-84-5
MF:C4H12O4Si
MW:152.22
MDL:MFCD00008341
CID:39522
PubChem ID:24885480
Update Time:2025-05-22

Tetramethoxysilane Chemical and Physical Properties

Names and Identifiers

    • Tetramethyl orthosilicate
    • Tetramethoxysilanecolorlessliq
    • Methyl silicate
    • DYNASIL M
    • Tetramethoxysilane
    • Silicon tetramethoxide
    • Methyl silicate 51
    • Tetramethyl silicate
    • methyl orthosilicate
    • O-METHYLSILICATE
    • orthosilicic acid tetramethyl ester
    • SILICATE,METHYL
    • Tetraethoxysilane
    • Tetramethosysilan
    • tetramethoxy-silan
    • tetramethoxy-silane
    • tl190
    • TMOS
    • Tetramethyl orthosilicate,98%
    • TETRAMETHOXYSILANE, 99+%
    • TETRAMETHOXYSILANE, 97%
    • Si(OMe)4
    • Si(OCH3)4
    • Silicic acid, tetramethyl ester
    • tetramethoxy silane
    • HSDB 5511
    • AKOS015902512
    • UN 2606
    • A836042
    • T0588
    • 19D35VPL66
    • J-524888
    • Tox21_200780
    • NS00041977
    • Tetra-methyl orthosilicate
    • TETRAMETHYL SILICATE [HSDB]
    • Silicic acid, methyl ester of ortho-
    • MSP 150
    • SIT 7510.0
    • NSC67383
    • MFCD00008341
    • M-Silicate 51
    • UN2606
    • Tetramethyl orthosilicate, >=99%
    • tetramethylortho-silicate
    • DTXCID207291
    • Methyl Silicate 39
    • Silane, tetramethoxy-
    • tetramethylortho silicate
    • Tetramethyl orthosilicate, purum, >=98.0% (GC)
    • Tetramethyl orthosilicate, deposition grade, >=98%, >=99.9% trace metals basis
    • TSL 8114
    • EC 211-656-4
    • Silicic acid (H4SiO4), tetramethyl ester
    • TETRAMETHYL ESTER SILICATE
    • WLN: 1O-SI-O1&O1&O1
    • AI3-11596
    • EINECS 211-656-4
    • Methyl silicate ((CH3)4SiO4)
    • DTXSID3027291
    • TL 190
    • CHEMBL3183859
    • NCGC00258334-01
    • Tetramethyl orthosilicate, puriss., >=99.0% (GC)
    • Tetramethyl orthosilicate, 98%
    • Q377159
    • s15925
    • NSC 67383
    • UNII-19D35VPL66
    • Methyl silicate, ((MeO)4Si)
    • LS-13029
    • F0001-1787
    • 681-84-5
    • CAS-681-84-5
    • Methyl orthosilicate [UN2606] [Poison]
    • Methyl silicate 56
    • Methyl silicate 28
    • Tetramethylsilikat
    • Methyl silicate ((MeO)4Si)
    • SCHEMBL17814
    • Tetramethylsilikat [Czech]
    • NCGC00248830-01
    • tetramethylorthosilicate
    • NSC-67383
    • EN300-395310
    • MDL: MFCD00008341
    • Inchi: 1S/C4H12O4Si/c1-5-9(6-2,7-3)8-4/h1-4H3
    • InChI Key: LFQCEHFDDXELDD-UHFFFAOYSA-N
    • SMILES: CO[Si](OC)(OC)OC
    • BRN: 1699658

Computed Properties

  • Exact Mass: 152.05000
  • Monoisotopic Mass: 152.05048539g/mol
  • Isotope Atom Count: 0
  • Hydrogen Bond Donor Count: 0
  • Hydrogen Bond Acceptor Count: 4
  • Heavy Atom Count: 9
  • Rotatable Bond Count: 4
  • Complexity: 55.5
  • Covalently-Bonded Unit Count: 1
  • Defined Atom Stereocenter Count: 0
  • Undefined Atom Stereocenter Count : 0
  • Defined Bond Stereocenter Count: 0
  • Undefined Bond Stereocenter Count: 0
  • Surface Charge: 0
  • Tautomer Count: nothing
  • XLogP3: nothing
  • Topological Polar Surface Area: 36.9?2

Experimental Properties

  • Color/Form: Colorless liquid with special smell and easy to deliquescence. [1]
  • Density: 1.023
  • Melting Point: -2 oC
  • Boiling Point: 122°C
  • Flash Point: 26 oC
  • Refractive Index: 1.367-1.37
  • Solubility: Miscible with ethanol and organic solvents. Immiscible with water.
  • Water Partition Coefficient: hydrolysis
  • PSA: 36.92000
  • LogP: 0.00760
  • Vapor Pressure: 3.35 psi ( 20 °C)
  • Sensitiveness: Moisture Sensitive
  • FEMA: 3185 | METHYLATED SILICA
  • Solubility: Insoluble in water, miscible in most organic solvents. [9]

Tetramethoxysilane Security Information

  • Symbol: GHS02 GHS05 GHS06
  • Prompt:dangerous
  • Signal Word:Danger
  • Hazard Statement: H226,H315,H318,H330,H335
  • Warning Statement: P260,P280,P284,P305+P351+P338,P310
  • Hazardous Material transportation number:UN 2606 6.1/PG 1
  • WGK Germany:3
  • Hazard Category Code: R10;R26;R37/38;R41
  • Safety Instruction: S16-S26-S36/37/39-S45-S28A
  • FLUKA BRAND F CODES:10-21
  • RTECS:VV9800000
  • Hazardous Material Identification: T+
  • HazardClass:6.1
  • PackingGroup:I
  • TSCA:Yes
  • Explosive Limit:0.88-23.8%(V)
  • Packing Group:I
  • Hazard Level:6.1
  • Safety Term:6.1
  • Packing Group:I
  • Risk Phrases:R10; R26; R37/38; R41
  • Storage Condition:Argon filled storage

Tetramethoxysilane Customs Data

  • HS CODE:29209085
  • Customs Data:

    China Customs Code:

    2920909090

    Overview:

    2920909090 Other inorganic esters(Esters excluding hydrogen halide)(Including its salts and their halogenation,sulfonation,Nitration and nitrosation derivatives).Regulatory conditions:nothing.VAT:17.0%.Tax refund rate:9.0%.MFN tariff:6.5%.general tariff:30.0%

    Declaration elements:

    Product Name, component content, use to

    Summary:

    2920909090 esters of other inorganic acids of non-metals (excluding esters of hydrogen halides) and their salts; their halogenated, sulphonated, nitrated or nitrosated derivatives.Supervision conditions:None.VAT:17.0%.Tax rebate rate:9.0%.MFN tariff:6.5%.General tariff:30.0%

Tetramethoxysilane Pricemore >>

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Tetramethoxysilane Production Method

Tetramethoxysilane Suppliers

Tiancheng Chemical (Jiangsu) Co., Ltd
Gold Member
Audited Supplier Audited Supplier
(CAS:681-84-5)四甲氧基硅烷
Order Number:LE1754102;LE3886
Stock Status:in Stock
Quantity:25KG,200KG,1000KG
Purity:99%
Pricing Information Last Updated:Friday, 20 June 2025 12:36
Price ($):discuss personally
Amadis Chemical Company Limited
Gold Member
Audited Supplier Audited Supplier
(CAS:681-84-5)Tetramethoxysilane
Order Number:A1238198
Stock Status:in Stock
Quantity:500g
Purity:99%
Pricing Information Last Updated:Friday, 30 August 2024 19:05
Price ($):174
Suzhou Senfeida Chemical Co., Ltd
Gold Member
Audited Supplier Audited Supplier
(CAS:681-84-5)Tetramethyl orthosilicate
Order Number:sfd13595
Stock Status:in Stock
Quantity:200kg
Purity:99.9%
Pricing Information Last Updated:Friday, 19 July 2024 14:36
Price ($):discuss personally

Additional information on Tetramethoxysilane

Tetramethoxysilane: A Comprehensive Overview

Tetramethoxysilane, also known as tetramethylsilane oxide, is a versatile organosilicon compound with the CAS number 681-84-5. This compound, often abbreviated as TMOS, has garnered significant attention in recent years due to its wide-ranging applications in various industries. The tetramethoxysilane molecule consists of a silicon atom surrounded by four methoxy groups (-OCH3), making it a key player in the field of organosilicon chemistry.

One of the most notable aspects of tetramethoxysilane is its role as an intermediate in the synthesis of other silicon-based compounds. Recent studies have highlighted its potential in the production of high-performance materials, such as advanced ceramics and composites. The ability of tetramethoxysilane to undergo hydrolysis and condensation reactions has made it invaluable in the development of silica-based materials with tailored properties.

The chemical properties of tetramethoxysilane are closely tied to its molecular structure. Its low molecular weight and high volatility make it suitable for applications requiring precise control over reaction conditions. Researchers have explored the use of tetramethoxysilane in sol-gel processes, where it serves as a precursor for the formation of nanostructured silica. These nanostructures have found applications in optics, catalysis, and drug delivery systems.

In terms of industrial applications, tetramethoxysilane is widely used in the electronics industry as a precursor for the deposition of thin films. Recent advancements in semiconductor manufacturing have emphasized the importance of tetramethoxysilane in achieving high-quality dielectric layers. Its ability to form uniform films at relatively low temperatures has made it a preferred choice for next-generation electronic devices.

The environmental impact of tetramethoxysilane has also been a topic of interest. Studies have shown that its decomposition products are non-toxic and biodegradable, making it a safer alternative to other organosilicon compounds. This eco-friendly profile aligns with current trends toward sustainable chemistry and green manufacturing.

From a research perspective, tetramethoxysilane continues to be a focal point for exploring novel chemical reactions and material properties. Its reactivity with various functional groups has opened avenues for the synthesis of hybrid materials with enhanced mechanical and thermal stability. Recent breakthroughs in click chemistry have further expanded the potential applications of tetramethoxysilane, particularly in the development of self-healing polymers.

In conclusion, tetramethoxysilane stands out as a multifaceted compound with significant contributions across diverse fields. Its unique chemical properties, coupled with its versatility in synthesis and application, position it as a cornerstone material for future technological advancements. As research into tetramethoxysilane continues to evolve, its role in shaping innovative solutions will undoubtedly grow even more prominent.

Recommended suppliers
Tiancheng Chemical (Jiangsu) Co., Ltd
(CAS:681-84-5)四甲氧基硅烷
LE1754102;LE3886
Purity:99%/99%
Quantity:25KG,200KG,1000KG/25KG,200KG,1000KG
Price ($):Inquiry/Inquiry
Email
Amadis Chemical Company Limited
(CAS:681-84-5)Tetramethoxysilane
A1238198
Purity:99%
Quantity:500g
Price ($):174
Email