Description

Dimethylsiloxane, 3-(Trimethoxysilyl)-1-Propanethiol is a specialized organosilicon compound that functions as a dual-functional silane coupling agent, featuring both hydrolyzable methoxysilyl groups and a reactive thiol moiety. This unique molecular architecture makes it a critical component for creating durable covalent bonds between inorganic substrates and organic polymers, enhancing adhesion, dispersion, and mechanical properties in composite materials. It is essential for manufacturers in the advanced coatings, sealants, adhesives, and specialty rubber industries seeking to improve product performance and longevity.

Application

• Adhesion Promoter in glass fiber-reinforced plastics (GRP) and mineral-filled composites.
• Surface Modification Agent for silica, glass, and metal oxides to improve compatibility with polymer matrices.
• Crosslinking Co-agent in peroxide-cured elastomers and silicone rubber formulations.
• Primer Component for coatings and adhesives on difficult-to-bond substrates like aluminum and glass.
• Reinforcing Agent in tire tread and industrial rubber compounds to enhance filler-polymer interaction.
• Hydrophobic Coating Precursor for creating water-repellent surfaces on construction materials.
• Chain Transfer Agent or modifier in radical polymerization processes.

Basic Information

Product Name	Dimethylsiloxane, 3-(Trimethoxysilyl)-1-Propanethiol
CAS No.	69430-38-2
Molecular Formula	C8H20O3SSi2
Molecular Weight	240.48 g/mol
Synonyms	3-(Trimethoxysilyl)-1-propanethiol, dimethylsiloxane derivative; (3-Mercaptopropyl)trimethoxysilane, dimethylsiloxane oligomer; Silane coupling agent, mercapto-functional; γ-Mercaptopropyltrimethoxysilane, siloxane-modified; MPTMS siloxane; SH-Si(OCH3)3 functionalized polydimethylsiloxane; Thiol-functional alkoxysilane oligomer
EINECS	Contact for details

Quality Control

Our production of Dimethylsiloxane, 3-(Trimethoxysilyl)-1-Propanethiol adheres to a stringent quality management system to ensure batch-to-batch consistency and reliability. Each lot is analyzed for critical parameters including purity, functional group content, and viscosity. A comprehensive Certificate of Analysis (COA) detailing the results is provided with every shipment, confirming compliance with agreed specifications and supporting your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at temperatures between 15-25°C (59-77°F). Due to its hygroscopic and easily oxidized nature, it is recommended to store under an inert atmosphere (e.g., nitrogen or argon) and minimize exposure to air and moisture to preserve product integrity.

Specification

Item	Specification
Appearance	Colorless to pale yellow liquid
Identification (IR)	Conforms to structure
Assay (GC)	≥ 95.0%
Thiol Content (Titration)	Contact for details
Methoxysilyl Content	Contact for details
Viscosity (25°C)	Contact for details
Density (25°C)	~1.0 g/mL
Water Content (KF)	≤ 0.5%

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.