Description

3-Mercaptopropyltriethoxysilane is a bifunctional organosilane coupling agent featuring a hydrolyzable ethoxysilyl group and a reactive mercapto (thiol) group. This dual functionality makes it a critical component for enhancing adhesion between inorganic materials and organic polymers, particularly in demanding environments. It is widely utilized in the rubber, plastics, coatings, and sealants industries to improve mechanical properties, durability, and moisture resistance. The product is supplied under strict quality control to ensure consistent performance for industrial applications.

Application

• As a key coupling agent in silica-filled rubber compounds (e.g., tires, shoe soles) to improve reinforcement and reduce rolling resistance.
• Surface modification of glass fibers and minerals (e.g., silica, clay) to enhance compatibility and bonding with polymer matrices in composites.
• Primer or additive in adhesives and sealants to promote adhesion to glass, metals, and concrete substrates.
• Intermediate in the synthesis of specialty silanes and for introducing thiol functionality onto surfaces for further chemical modification.
• Component in coatings and inks to improve scratch resistance, corrosion protection, and substrate wetting.
• Used as a chain transfer agent or modifier in certain polymerization processes.

Basic Information

Product Name	3-Mercaptopropyltriethoxysilane
CAS No.	14814-09-6
Molecular Formula	C9H22O3SSi
Molecular Weight	238.42 g/mol
Synonyms	(3-Mercaptopropyl)triethoxysilane; Mercapto silane; 3-Triethoxysilyl-1-propanethiol; γ-Mercaptopropyltriethoxysilane; MPTES; SH-Si(OEt)3; Silane A-1891; KH-590; Dynasylan 3201; Propyldisulfide, 3-(triethoxysilyl)-
EINECS	238-885-0

Quality Control

Our 3-Mercaptopropyltriethoxysilane is manufactured under a stringent quality management system. Every batch undergoes rigorous analytical testing, including Gas Chromatography (GC) for purity and assay, to ensure it meets precise specifications for industrial applications. A comprehensive Certificate of Analysis (COA) detailing purity, identity, and key physical properties is provided with each shipment to guarantee traceability and performance consistency.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at 15-25°C. This material is easily oxidized (store under inert atmosphere) and highly volatile. Keep away from strong oxidizing agents, acids, and bases. Under recommended storage conditions, the product remains stable for at least 24 months from the date of manufacture.

Specification

Item	Specification
Appearance	Colorless to pale yellow clear liquid
Identification (IR)	Conforms
Assay (GC)	≥ 97.0%
Refractive Index (n20/D)	1.428 - 1.433
Density (20°C)	0.98 - 1.00 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.