Description

3-Thiocyanatopropyltriethoxysilane is a bifunctional organosilane coupling agent that contains both a hydrolyzable ethoxysilyl group and a reactive thiocyanate (SCN) functional group. This unique molecular 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 manufacturers in the rubber, adhesive, sealant, and composite industries seeking to enhance mechanical properties, chemical resistance, and long-term durability in their products.

Application

• Rubber Reinforcement: As a key coupling agent in silica-filled tire tread and other rubber compounds to improve filler dispersion, reduce rolling resistance, and enhance abrasion resistance.
• Adhesive & Sealant Formulations: To improve the adhesion of polysulfide, polyurethane, and silicone-based sealants and adhesives to glass, metals, and mineral surfaces.
• Fiberglass & Mineral Reinforced Composites: As a sizing or primer on glass fibers and mineral fillers to increase interfacial bonding with polymer matrices like epoxy, polyester, or nylon.
• Surface Treatment & Coatings: For modifying the surface of pigments, fillers, and metals to improve compatibility, dispersion stability, and corrosion resistance in coating systems.
• Specialty Polymer Synthesis: Serving as a monomer or crosslinking agent in the synthesis of hybrid organic-inorganic polymers with tailored properties.

Basic Information

Product Name	3-Thiocyanatopropyltriethoxysilane
CAS No.	34708-08-2
Molecular Formula	C10H21NO3SSi
Molecular Weight	263.43 g/mol
Synonyms	Triethoxy(3-thiocyanatopropyl)silane; (3-Thiocyanatopropyl)triethoxysilane; Silane A-189; γ-Thiocyanatopropyltriethoxysilane; 3-Triethoxysilylpropyl thiocyanate; NSC 93726; Union Carbide A-189; Momentive Silquest A-189
EINECS	252-171-2

Quality Control

Our production of 3-Thiocyanatopropyltriethoxysilane adheres to stringent quality management protocols to ensure batch-to-batch consistency and high purity. Each lot is analyzed using advanced techniques including Gas Chromatography (GC) and Infrared Spectroscopy (IR) to verify identity, assay, and impurity profiles. A comprehensive Certificate of Analysis (COA) detailing all test results is provided with every shipment to support your quality assurance and regulatory compliance 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). This product is hygroscopic (moisture-sensitive). Keep the container tightly sealed under a dry inert atmosphere (e.g., nitrogen) to prevent hydrolysis and degradation upon contact with atmospheric moisture.

Specification

Item	Specification
Appearance	Clear, colorless to pale yellow liquid
Identification (IR)	Conforms
Assay (GC)	≥ 97.0%
Refractive Index (n20/D)	1.445 - 1.455
Density (20°C)	1.05 - 1.10 g/mL

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