Description

3-Cyanopropyltriethoxysilane is a bifunctional organosilane coupling agent featuring a reactive triethoxysilyl group and a terminal nitrile (cyano) functionality. This unique molecular structure enables it to act as a versatile chemical bridge, promoting adhesion and compatibility between inorganic substrates and organic polymers or resins. It is essential for formulators and manufacturers in the composites, coatings, and sealants industries seeking to enhance the mechanical properties, durability, and moisture resistance of their products.

Application

• As a coupling agent in mineral-filled composites (e.g., glass fiber, silica, clay) to improve filler dispersion and interfacial bonding with polymer matrices like epoxy, polyurethane, and nylon.
• A key surface treatment for silica and other inorganic particles to improve their compatibility and performance in silicone rubber and other elastomeric systems.
• Used in the formulation of primers and adhesion promoters for coatings and sealants on difficult substrates such as glass, metals, and concrete.
• As a chemical intermediate for the synthesis of more complex silane molecules, leveraging the reactive cyano group for further transformations.
• In the production of moisture-curable resins and crosslinking agents, where the ethoxy groups hydrolyze to form silanol bonds.
• For modifying the surface of nanoparticles to prevent agglomeration and facilitate their integration into advanced composite materials.

Basic Information

Product Name	3-Cyanopropyltriethoxysilane
CAS No.	1067-47-6
Molecular Formula	C10H21NO3Si
Molecular Weight	231.37 g/mol
Synonyms	Triethoxy(3-cyanopropyl)silane; (3-Cyanopropyl)triethoxysilane; γ-Cyanopropyltriethoxysilane; Cyanoethyltriethoxysilane; Silane, triethoxy(3-cyanopropyl)-; Silane A-3; KH-573; Dynasylan® CPTEO; CPTES
EINECS	213-926-5

Quality Control

Our 3-Cyanopropyltriethoxysilane is manufactured under a strict quality management system. Each batch undergoes rigorous analytical testing, including gas chromatography (GC) for purity and identity verification, to ensure it meets precise specifications and consistent performance for industrial applications. Certificates of Analysis (COA) with detailed batch-specific data are available upon request to support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). This product is hygroscopic (moisture-sensitive). Keep the container tightly sealed when not in use to prevent degradation from atmospheric moisture. Keep away from heat and incompatible materials such as strong acids and bases.

Specification

Item	Specification
Appearance	Colorless to pale yellow clear liquid
Identification (IR)	Conforms
Purity (GC)	≥ 97.0%
Refractive Index (n20/D)	1.420 - 1.425
Density (g/mL, 25°C)	0.990 - 1.010

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