Description

Trimethoxysilylpropanethiol is a bifunctional organosilane coupling agent featuring both a hydrolyzable methoxysilyl group and a reactive thiol (-SH) group. This unique molecular structure enables it to form durable chemical bridges between inorganic substrates and organic polymers, significantly enhancing adhesion, dispersion, and mechanical properties. It is essential for manufacturers in the rubber, coatings, adhesives, and composite materials industries seeking to improve product performance and longevity.

Application

• Silane Coupling Agent for Sulfur-Cured Rubbers: Enhances the bonding between silica fillers and rubber matrices in tire treads and industrial rubber goods, reducing rolling resistance and improving wear.
• Surface Modification of Inorganic Fillers: Used to treat silica, glass, and metal oxides to improve their compatibility and dispersion in polymer systems.
• Adhesion Promoter in Coatings and Sealants: Improves the adhesion of polysulfide and other sealants to glass, metal, and concrete surfaces.
• Intermediate for Specialty Chemicals: Serves as a key building block in the synthesis of more complex silane derivatives and functionalized materials.
• Fiberglass and Mineral Wool Treatment: Acts as a sizing agent to improve the interfacial strength between glass fibers and resin in composites.
• Crosslinking Agent: Utilized in the formulation of moisture-curable polymers and resins.

Basic Information

Product Name	Trimethoxysilylpropanethiol
CAS No.	4420-74-0
Molecular Formula	C6H16O3SSi
Molecular Weight	196.34 g/mol
Synonyms	3-Mercaptopropyltrimethoxysilane; (3-Mercaptopropyl)trimethoxysilane; MPTMS; Trimethoxy(3-mercaptopropyl)silane; 3-Trimethoxysilyl-1-propanethiol; γ-Mercaptopropyltrimethoxysilane; Silane A-189; KH-590
EINECS	224-588-5

Quality Control

Our Trimethoxysilylpropanethiol is manufactured under a strict quality management system. Every batch undergoes comprehensive analytical testing, including GC, NMR, and titration methods, to ensure consistent purity and performance. A detailed Certificate of Analysis (COA) is provided with each shipment, confirming compliance with agreed specifications.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at 15-25°C. This material is hygroscopic (moisture-sensitive) and easily oxidized; it is recommended to store under an inert atmosphere (nitrogen or argon) for long-term preservation. Keep away from strong oxidizing agents and bases.

Specification

Item	Specification
Appearance	Colorless to pale yellow clear liquid
Identification (IR)	Conforms
Assay (GC)	≥ 97.0%
Refractive Index (n20D)	1.440 - 1.445
Density (20°C)	1.05 - 1.07 g/mL

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