Description

3-Cyanopropyltrimethoxysilane is a bifunctional organosilane coupling agent that combines a reactive trimethoxysilane group with a terminal nitrile functionality. This unique structure enables it to act as a molecular bridge, enhancing adhesion and compatibility between inorganic materials and organic polymers or resins. It is essential for manufacturers in the composites, adhesives, coatings, and electronics industries seeking to improve the mechanical properties, durability, and performance of their products.

Application

• Surface Modification of Fillers and Reinforcements: Primarily used to treat silica, glass fibers, and minerals to improve their dispersion and interfacial bonding within polymer matrices like epoxy, polyurethane, and silicone.
• Adhesives and Sealants: Enhances the adhesion of silicone and other polymer-based formulations to difficult substrates such as metals, glass, and plastics, improving bond strength and environmental resistance.
• Coatings and Inks: Serves as an adhesion promoter in protective coatings, paints, and printing inks, ensuring excellent film integrity and substrate wetting.
• Rubber and Tire Manufacturing: Used as a coupling agent in silica-filled rubber compounds to reduce rolling resistance and improve wet grip in high-performance tires.
• Electronics and Encapsulation: Improves the adhesion of epoxy molding compounds and potting materials to electronic components and lead frames, enhancing device reliability.
• Fiberglass and Composite Materials: A key sizing agent for fiberglass, improving the fiber-resin interface to yield composites with superior mechanical strength and moisture resistance.
• Mineral-filled Plastics: Modifies the surface of talc, calcium carbonate, and other mineral fillers in thermoplastics (e.g., polypropylene, nylon) to increase composite strength and impact resistance.

Basic Information

Product Name	3-Cyanopropyltrimethoxysilane
CAS No.	55453-24-2
Molecular Formula	C7H15NO3Si
Molecular Weight	189.29 g/mol
Synonyms	γ-Cyanopropyltrimethoxysilane; (3-Cyanopropyl)trimethoxysilane; Trimethoxy(3-cyanopropyl)silane; Cyanoethyltrimethoxysilane (common misnomer); Silane, trimethoxy(3-cyanopropyl)-; NCI Open Database ID; Adhesion Promoter 3-CPTS; Coupling Agent CN-110; KBM-573 (Shin-Etsu equivalent)
EINECS	259-726-0

Quality Control

Our 3-Cyanopropyltrimethoxysilane is manufactured under a strict quality management system. Each batch undergoes rigorous analytical testing, including gas chromatography (GC) for purity and identity confirmation, to ensure it meets precise specifications for industrial and specialty applications. Certificates of Analysis (COA) detailing purity, assay, and key physical properties are provided with every shipment to guarantee consistency and traceability.

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 maintain product integrity.

Specification

Item	Specification
Appearance	Colorless to pale yellow clear liquid
Identification (IR)	Conforms to structure
Assay (GC)	≥ 97.0%
Refractive Index (n20/D)	1.418 - 1.422
Density (20°C)	1.00 - 1.05 g/cm³
Moisture (Karl Fischer)	≤ 0.5%

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