Description

3-Mercaptopropyltributoxysilane is a bifunctional organosilane coupling agent featuring both a hydrolyzable alkoxysilyl group and a reactive mercapto (thiol) group. This unique structure enables it to form durable chemical bridges between inorganic substrates and organic polymers, significantly enhancing adhesion, mechanical properties, and durability in composite materials. It is an essential raw material for formulators and manufacturers in the coatings, adhesives, sealants, and elastomers (CASE) industries, as well as in advanced material science for surface modification and filler treatment.

Application

• As a key coupling agent and adhesion promoter in rubber-to-metal bonding and tire manufacturing.
• Surface treatment of mineral fillers (e.g., silica, glass fibers, metals) to improve dispersion and compatibility in polymer matrices.
• Formulation of high-performance sealants, adhesives, and moisture-curable systems.
• Enhancing the corrosion resistance and adhesion of primers and protective coatings on metal, glass, and concrete.
• Modification of silicone resins and polymers to introduce crosslinking sites or improve properties.
• Used in the synthesis of specialty silane intermediates for further chemical reactions.

Basic Information

Product Name	3-Mercaptopropyltributoxysilane
CAS No.	42169-84-6
Molecular Formula	C15H34O3SSi
Molecular Weight	322.58 g/mol
Synonyms	(3-Mercaptopropyl)tributoxysilane; Tributoxy(3-mercaptopropyl)silane; 3-Tributoxysilyl-1-propanethiol; Silane, tributoxy(3-mercaptopropyl)-; Mercaptopropyltributoxysilane; Thiol-functional silane; SH-silane; Silane coupling agent KH-590 (common trade designation)
EINECS	Contact for details

Quality Control

Our production of 3-Mercaptopropyltributoxysilane adheres to stringent quality management protocols to ensure batch-to-batch consistency and high purity. Each lot is analyzed against comprehensive specifications using advanced analytical techniques. A Certificate of Analysis (COA) detailing purity, identity, and key physical-chemical parameters is provided with every shipment to support your quality assurance and regulatory needs.

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). Due to its moisture-sensitive (hygroscopic) and easily oxidized nature, it is recommended to store under an inert atmosphere (e.g., nitrogen) after opening to maintain product integrity and shelf life. Keep away from strong oxidizing agents.

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 (g/mL, 20°C)	0.98 - 1.02
SH Content	Contact for details

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