Description and features

SilQon MTMO (3-Trimethoxysilyl propane-1-thiol) is a versatile organosilane compound used in various industrial applications. Also known as TMSP-T, it features a trialkoxysilyl functional group attached to a thiol group, making it valuable for surface modification, adhesive formulations, and as a coupling agent in composite materials. Its unique chemical structure enables it to facilitate strong adhesion between organic and inorganic substrates, enhancing the durability and performance of coatings, sealants, and composites. With excellent moisture resistance and bonding properties, 3-trimethoxysilyl propane-1-thiol contributes to the advancement of materials science across multiple sectors.

SilQon MTMO (3-trimethoxysilyl propane-1-thiol) is also known as 3-Mercaptopropyl)trimethoxysilane and TMSP-T .


Europe: SilQon MTMO is ➔ on stock in our local warehouse. Our lead time is about one week if delivered in 200 Kg drums.

United States, Canada, South America, South Africa and other markets can also be served, please contact our sales department for more details.

This product (CAS: 4420-74-0) has been registered under REACH (EC) 1907/2006.

Product Identification

CAS number 4420-74-0
EC number 224-588-5
HS code 2930 90 98
EC name 3-trimethoxysilylpropane-1-thiol
IUPAC name 3-triethoxysilylpropane-1-thiol


AppearanceClear or slight yellowish liquid
Assay≥98.0 %
Colour APHA≤20


SilQon MTMO is commonly used as a silane coupling agent or a surface modifier in various industrial applications. Some common uses include: Adhesives and Sealants: It is often used as an adhesion promoter in adhesive and sealant formulations, especially those involving substrates like glass, metals, or ceramics. Coatings and Paints: It can improve the adhesion of coatings and paints to surfaces like metals, plastics, or glass, enhancing their durability and resistance. Rubber Compounding: It is employed in rubber compounding processes to enhance the bonding between rubber and reinforcing fillers such as silica or carbon black. Fiberglass and Composites: In the production of fiberglass and composite materials, this substance can act as a coupling agent between the matrix material (resin) and the reinforcing fibers, improving mechanical properties. Surface Modification: It is used for modifying surfaces of various materials, including metals, glass, and ceramics, to improve their compatibility with other materials or coatings.

Waterproofing and Corrosion Protection: Due to its ability to bond with surfaces and repel water, it’s used in waterproofing applications and as a corrosion inhibitor on metal surfaces. Electronic Components: It can be used in the manufacturing of electronic components to improve adhesion between different layers or substrates, providing better performance and reliability. Overall, its versatile properties make it a valuable component in many industrial processes where enhanced adhesion, durability, and surface modification are required.


Available packaging: 2000 KG drums, 1.000 KG IBC.
Special packaging is available on request.


Store 3-trimethoxysilyl propane-1-thiol in a dry and well-ventilated area and in line with legal requirements.
Keep SilQon MTMO away from heat sources and oxidizing agents.


A Material Safety Data Sheets (MSDS) is available for SilQon MTMO and all other products supplied by Vesta Chemicals BV.

An MSDS describes the hazards of a product and explains how a product can be safely handled, used and stored. Besides it provides important regulatory and emergency response information for the purchased product.

Molecular and structural information

Molecular formula C6H16O3SSi
Molecular weight 196.34 g/mol
Smiles notation CO[Si](CCCS)(OC)OC
Structural formula MTMO

Physicochemical information

Boiling point 200 ºC @ 1013 hPa
Density 1.015 @ 20°C
Flash point 95 °C @ 1013 hPa
Melting point -80 °C at 1013 hPa
Log Kow-0.82
Solubility in water 1.000 000 mg/L
Vapor pressure (MGM) 0 Pa at 25°C