Methyltrimethoxysilane | Cas No.1185-55-3

Methyltrimethoxysilane Cas No.1185-55-3 (MTMS) is an organic silicon compound with the chemical formula CH3Si(OCH3)3. It is a colorless, clear, and odorless liquid. MTMS is a versatile compound that is used in a variety of applications, including:

  • Polymerization

MTMS is used as a cross-linking agent in the polymerization of silicones. This process creates a network of polymer chains that are strong and durable. MTMS-based polymers are used in a variety of applications, including sealants, adhesives, and coatings.

  • Coatings

MTMS is used as a coating for a variety of substrates, including metal, glass, and plastic. The coating provides a barrier against moisture, corrosion, and other environmental factors. MTMS-based coatings are used in a variety of applications, including automotive, electronics, and construction.

  • Cosmetics

MTMS is used in cosmetics as a thickener, film former, and emollient. It helps to improve the texture and feel of cosmetics, and it can also help to protect the skin from the sun’s harmful rays. MTMS-based cosmetics are used in a variety of products, including moisturizers, sunscreens, and makeup.

  • Other applications

MTMS is also used in a variety of other applications, including:

Some of the specific applications of MTMS are:

  • Synthesis of polyethyleneimine-silica (PEI-silica) organic-inorganic hybrid particles, which can be used for adsorption and separation of biomolecules.
  • Modification of hydrophilic ceramic surfaces to hydrophobic by transforming the -OH groups on the surface to -OCH3 groups.
  • Synthesis of silica aerogels by acid-base sol-gel polymerization, which can be further modified by MTMS to induce hydrophobicity and enhance mechanical properties without affecting transparency.
  • Synthesis of ionogels, where an ionic liquid is confined within silica-derived networks, which can be used as electrolytes for electrochemical devices.
  • Synthesis of monolithic silica columns with various skeleton sizes for capillary liquid chromatography, which can be used for separation and analysis of complex mixtures.
  • Synthesis of hydrophobic, flexible, and ultralightweight silylated nanocellulose sponges for the selective removal of oil from water.
Product code PR-1630
English Name: Methyltrimethoxysilane
Alias: Trimethoxy(methyl)silane
Molecular formula: C4H12O3Si
Molecular weight: 136.22
CAS Number: 1185-55-3
EINECS Number: 214-685-0
InChI: 1S/C4H12O3Si/c1-5-8(4,6-2)7-3/h1-4H3
Physicochemical properties
Boiling point: 102ºC
Water solubility: decompose
Refractive index: 1.3695-1.3715
Flash point: 11ºC
Density: 0.955


Methyltrimethoxysilane (MTMS) is an organosilicon compound with the chemical formula CH3Si(OCH3)3. It is also known as trimethoxymethylsilane or methyltrimethoxysilane. It is a colorless liquid with a boiling point of 102-104 °C and a density of 0.955 g/mL at 25 °C. It has a molecular weight of 136.22 g/mol and a CAS number of 1185-55-3.

MTMS is widely used as a precursor for the preparation of silica-based materials, which find applications in various fields. Particularly, it can be used for molecular assembly, linking nano building blocks, and selective synthesis of oligosiloxane compounds. It can also be utilized as a crosslinker in the synthesis of polysiloxane polymers.


There is a certain irritation to the eyes and skin, once in contact must be washed with a large amount of water, it is necessary to see a doctor;
Wear protective eyes, masks, and protective gloves when using;

Packing: 25L drum packing; 208L closed steel drum packaging.

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