Description

Chlorophenyltriethoxysilane is a versatile organosilicon coupling agent featuring a reactive chlorophenyl group and hydrolyzable ethoxy groups. This bifunctional structure is critical for creating durable chemical bridges between inorganic substrates and organic polymers, enhancing adhesion, compatibility, and material performance. It is essential for manufacturers in the composites, coatings, and sealants industries seeking to improve the mechanical properties and longevity of their products. The compound is also a valuable intermediate in the synthesis of more complex silane derivatives and specialty silicones.

Application

• Surface Modification Agent: Used to treat glass fibers, minerals (e.g., silica, clay), and metals to improve their adhesion to epoxy, phenolic, and other polymer resins in composite materials.
• Adhesion Promoter in Coatings & Sealants: Enhances the bonding of paints, primers, and sealants to challenging substrates like metals, glass, and concrete, providing superior moisture and corrosion resistance.
• Filler & Pigment Treatment: Modifies the surface of inorganic fillers and pigments (e.g., calcium carbonate, titanium dioxide) to improve dispersion and compatibility in plastic and rubber matrices, reducing viscosity and enhancing mechanical properties.
• Silicone Intermediate: Serves as a key building block in the synthesis of phenyl-containing silicone oils, resins, and elastomers, imparting thermal stability and specific refractive indices.
• Water Repellent for Construction Materials: Imparts hydrophobic properties to stone, brick, and concrete, protecting structures from water ingress, frost damage, and staining.
• Crosslinking Agent: Functions as a crosslinker in silicone-based formulations and room-temperature vulcanizing (RTV) systems.

Basic Information

Product Name	Chlorophenyltriethoxysilane
CAS No.	21700-74-3
Molecular Formula	C12H19ClO3Si
Molecular Weight	274.82 g/mol
Synonyms	(4-Chlorophenyl)triethoxysilane; 4-Chlorophenyltriethoxysilane; Triethoxy(4-chlorophenyl)silane; p-Chlorophenyltriethoxysilane; Silane, triethoxy(4-chlorophenyl)-; Chlorophenyltriethoxysilane; (p-Chlorophenyl)triethoxysilane; A 1624 (Momentive trade name)
EINECS	244-531-8

Quality Control

Our Chlorophenyltriethoxysilane is produced under strict quality management protocols. Every batch undergoes rigorous analytical testing, including Gas Chromatography (GC) and FT-IR spectroscopy, to ensure consistent purity and performance. A comprehensive Certificate of Analysis (COA) detailing assay, identity, and impurity profiles is provided with each shipment. Our quality system is designed to meet the stringent requirements of industrial and advanced material applications.

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. Keep away from strong acids, bases, and oxidizing agents.

Specification

Item	Specification
Appearance	Colorless to pale yellow clear liquid
Identification (IR)	Conforms to structure
Assay (GC)	≥ 97.0%
Density (20°C)	1.020 - 1.050 g/cm³
Refractive Index (n20/D)	1.470 - 1.480
Chlorine Content	12.5 - 13.5 %

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