Description

3-Chloroisobutyltrimethoxysilane is a versatile organosilicon compound that serves as a critical coupling agent and surface modifier. Its bifunctional structure, featuring both a reactive chloroisobutyl group and hydrolyzable methoxy silane groups, enables strong covalent bonding between inorganic substrates and organic polymers. This product is essential for manufacturers in the adhesives, sealants, coatings, and composite materials industries seeking to enhance material compatibility, adhesion, and durability. Its application is key to solving interfacial bonding challenges in high-performance material systems.

Application

• Adhesives & Sealants: Acts as an adhesion promoter, significantly improving bond strength between organic adhesives and inorganic surfaces like glass, metals, or minerals.
• Filled Polymer Composites: Used as a coupling agent for mineral-filled (e.g., silica, clay) or glass fiber-reinforced plastics (e.g., PP, PE, nylon), enhancing filler dispersion and mechanical properties.
• Surface Treatment: Provides a functional primer layer on glass, metals, and other oxides to modify surface energy and promote subsequent coating or bonding.
• Rubber Compounding: Improves the integration of silica and other reinforcing fillers in silicone and specialty rubber formulations, reducing viscosity and enhancing tear strength.
• Coatings & Inks: Enhances the scratch resistance, weather durability, and adhesion of protective and decorative coatings on difficult substrates.
• Crosslinking Agent: Serves as a crosslinker in moisture-curing silicone systems and other polymer networks, contributing to improved thermal and chemical resistance.

Basic Information

Product Name	3-Chloroisobutyltrimethoxysilane
CAS No.	17256-27-8
Molecular Formula	C7H17ClO3Si
Molecular Weight	212.75 g/mol
Synonyms	Trimethoxy(3-chloro-2-methylpropyl)silane; (3-Chloro-2-methylpropyl)trimethoxysilane; 3-Chloro-2-methylpropyltrimethoxysilane; Silane, trimethoxy(3-chloro-2-methylpropyl)-; Isobutyltrimethoxysilane, 3-chloro-; KBE 703 (Shin-Etsu trade name); Dynasylan® 6490 (Evonik trade name)
EINECS	241-285-7

Quality Control

Our production of 3-Chloroisobutyltrimethoxysilane adheres to stringent quality management protocols to ensure batch-to-batch consistency and reliability. Each lot is analyzed against comprehensive specifications using advanced techniques including Gas Chromatography (GC) and titration methods. A detailed Certificate of Analysis (COA) providing purity, identity, and impurity profiles is supplied with every shipment. Our quality system is designed to meet the demands of global industrial applications and support our customers' own quality assurance requirements.

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 material is hygroscopic (moisture-sensitive); containers must be kept tightly sealed and under a dry inert atmosphere (e.g., nitrogen) after opening to prevent hydrolysis and maintain product integrity. Keep away from heat, sparks, and open flame.

Specification

Item	Specification
Appearance	Clear, colorless to pale yellow liquid
Identification (IR)	Conforms to structure
Assay (GC)	≥ 97.0%
Density (20°C)	1.05 - 1.10 g/cm³
Refractive Index (n20/D)	1.415 - 1.425
Chloride Content	16.5 - 17.0 %

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