Description

3-Mercaptopropylmethyldimethoxysilane is a bifunctional organosilane coupling agent featuring both a hydrolyzable methoxysilyl group and a reactive mercapto (thiol) group. This unique structure makes it a critical component for modifying surfaces and enhancing the adhesion between inorganic materials and organic polymers. It is essential for manufacturers in the rubber, plastics, and coatings industries seeking to improve composite material performance. The compound is supplied under strict quality control to ensure batch-to-batch consistency for demanding industrial applications.

Application

• As a key coupling agent in silica-filled rubber compounds (e.g., tires, seals) to improve reinforcement and reduce rolling resistance.
• Surface treatment of glass fibers and minerals (e.g., silica, clay) to enhance bonding with epoxy, polyester, and other polymer resins in composites.
• Primer or additive in adhesive and sealant formulations to promote adhesion to glass, metal, and mineral substrates.
• Modification of fillers and pigments in plastic compounds to improve dispersion and mechanical properties.
• Intermediate in the synthesis of more complex silane derivatives and specialty chemicals.
• Component in waterproofing and corrosion-resistant coatings for construction materials.

Basic Information

Product Name	3-Mercaptopropylmethyldimethoxysilane
CAS No.	31001-77-1
Molecular Formula	C7H18O2SSi
Molecular Weight	194.37 g/mol
Synonyms	Mercaptopropylmethyldimethoxysilane; (3-Mercaptopropyl)methyldimethoxysilane; Methyldimethoxy(3-mercaptopropyl)silane; 3-Mercapto-1-propanol, 1-(dimethoxymethylsilyl)-; Silane, (3-mercaptopropyl)methyldimethoxy-; Dynasylan® 3201; KH-591; A-1891
EINECS	250-426-8

Quality Control

Our production of 3-Mercaptopropylmethyldimethoxysilane adheres to a stringent quality management system. Every batch is analyzed using advanced techniques like GC and titration to ensure high purity and consistent performance as a coupling agent. Certificates of Analysis (COA) detailing assay, identity, and impurity profiles are provided and available upon request to support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). This product is hygroscopic (moisture-sensitive). Keep the container tightly sealed under a dry inert atmosphere (e.g., nitrogen) to prevent moisture absorption and premature hydrolysis.

Specification

Item	Specification
Appearance	Colorless to pale yellow clear liquid
Identification (IR)	Conforms
Assay (GC)	≥ 97.0%
Refractive Index (n20/D)	1.440 - 1.445
Density (20°C)	1.00 - 1.05 g/cm³

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