Description

4-(Triethoxysilyl)Butane-2-Thiol is a bifunctional organosilane coupling agent containing both a hydrolysable triethoxysilyl group and a reactive thiol (-SH) moiety. This unique structure enables it to act as a powerful adhesion promoter and surface modifier, creating durable bonds between inorganic substrates and organic polymers. It is essential for formulators and manufacturers in the rubber, adhesive, and coatings industries seeking to enhance composite material performance, improve wet adhesion, and increase chemical resistance. The compound is supplied with CAS No. 57640-10-5.

Application

• Rubber & Tire Industry: Key silane coupling agent in the production of silica-filled rubber compounds for high-performance tires, improving filler dispersion, reducing rolling resistance, and enhancing wet grip.
• Adhesives & Sealants: Functions as an adhesion promoter in polysulfide, polyurethane, and silicone-based sealants and adhesives, particularly for bonding to glass, metals, and mineral surfaces.
• Coatings & Paints: Used to improve the adhesion, corrosion resistance, and durability of primers and protective coatings on metal, glass, and concrete substrates.
• Composite Materials: Enhances the interfacial bonding between glass or mineral fibers and polymer matrices (e.g., epoxy, polyester) in fiber-reinforced plastics (FRP).
• Surface Treatment: Applied as a surface modifier for silica, glass, and other minerals to impart hydrophobic properties or introduce reactive thiol groups for further functionalization.
• Crosslinking Agent: Serves as a co-agent or crosslinker in various polymer systems, utilizing the thiol group for click chemistry or radical-mediated reactions.

Basic Information

Product Name	4-(Triethoxysilyl)Butane-2-Thiol
CAS No.	57640-10-5
Molecular Formula	C10H24O3SSi
Molecular Weight	252.45 g/mol
Synonyms	2-Mercaptoethyltriethoxysilane; (3-Triethoxysilyl)-2-propanethiol; 3-Triethoxysilyl-2-propanethiol; 3-Mercaptopropyltriethoxysilane (common misnomer, check structure); Triethoxy(2-mercaptoethyl)silane; 2-Propanethiol, 3-(triethoxysilyl)-; Silane, triethoxy(2-mercaptoethyl)-; Thiol-functional triethoxysilane
EINECS	Contact for details

Quality Control

Every batch of 4-(Triethoxysilyl)Butane-2-Thiol is produced and tested under a strict quality management system. We provide comprehensive Certificates of Analysis (COA) that detail purity, identity, and key physical properties to ensure consistency and performance for your formulations. Our quality commitment aligns with industrial best practices, and we can support compliance requirements for global supply chains.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated place at room temperature (15-25°C). Due to its hygroscopic (moisture-sensitive) nature and tendency to be easily oxidized (store under inert atmosphere), the container must be kept tightly sealed under a dry inert gas (e.g., nitrogen or argon) after opening. Keep away from heat, sparks, and open flame.

Specification

Item	Specification
Appearance	Colorless to pale yellow clear liquid
Identification (IR)	Conforms to structure
Assay (GC)	≥ 95.0%
Refractive Index (n20D)	1.430 - 1.440
Density (g/mL, 20°C)	0.98 - 1.02
Water Content (KF)	≤ 0.5%

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