Description

2-Mercaptoethyltriethoxysilane is a bifunctional organosilane coupling agent containing both a hydrolyzable ethoxysilyl group and a reactive mercapto (thiol) group. This unique structure makes it a critical component for enhancing adhesion and compatibility between inorganic materials and organic polymers. It is essential for manufacturers in the rubber, plastics, and coatings industries seeking to improve the mechanical properties and durability of their composite materials. The compound is supplied under strict quality control to ensure consistent performance in demanding applications.

Application

• As a key coupling agent in silica-filled rubber compounds (e.g., tires, seals, hoses) to improve reinforcement and reduce rolling resistance.
• Surface modification of mineral fillers (e.g., glass fibers, silica, metals) to enhance bonding with polymer matrices in composites.
• Adhesion promoter in sealants, adhesives, and coatings, particularly for glass, metal, and mineral substrates.
• Intermediate in the synthesis of specialty silane-modified polymers and other functional organosilicon compounds.
• Used in the production of moisture-curable systems where the thiol group can participate in further chemical reactions.

Basic Information

Product Name	2-Mercaptoethyltriethoxysilane
CAS No.	18236-15-2
Molecular Formula	C8H20O3SSi
Molecular Weight	224.39 g/mol
Synonyms	(3-Mercaptopropyl)triethoxysilane; 3-Mercaptopropyltriethoxysilane; Triethoxy(3-mercaptopropyl)silane; 3-Triethoxysilyl-1-propanethiol; Silane A-1891; MPTES; Mercapto silane; γ-Mercaptopropyltriethoxysilane
EINECS	242-129-1

Quality Control

Our 2-Mercaptoethyltriethoxysilane is manufactured under a stringent quality management system. Each batch undergoes comprehensive analytical testing, including assay by GC, purity verification, and control of key impurities, to ensure it meets precise specifications for industrial applications. A Certificate of Analysis (COA) detailing all test results is provided with every shipment to guarantee traceability and consistency.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated place at room temperature (15-25°C). This product is easily oxidized (store under inert atmosphere) and is highly volatile. Keep away from heat, sparks, and open flame. Use under an inert gas blanket for extended storage or after opening to maintain purity.

Specification

Item	Specification
Appearance	Colorless to pale yellow clear liquid
Identification (IR)	Conforms
Assay (GC)	≥ 97.0%
Refractive Index (n20/D)	1.430 - 1.435
Density (20°C)	0.990 - 1.010 g/mL

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