Description

n-Octadecylmethoxydichlorosilane is a high-purity organosilicon compound, specifically a long-chain alkylchlorosilane. This chemical is a critical intermediate for introducing hydrophobic and organofunctional properties onto surfaces and into polymer matrices. It is essential for manufacturers in the advanced materials, coatings, and specialty chemical sectors seeking to modify surface energy and enhance material compatibility.

Application

• Surface Modification Agent: Primarily used as a coupling agent or primer for modifying glass, silica, metals, and other inorganic surfaces to impart hydrophobicity and improve adhesion with organic polymers.
• Silicone Intermediate: Serves as a key monomer or intermediate in the synthesis of specialty silicone oils, resins, and elastomers with long alkyl chain functionality.
• Nanomaterial Functionalization: Employed to functionalize nanoparticles (e.g., silica, titania) to prevent agglomeration and facilitate dispersion in non-polar organic solvents or polymer composites.
• Water-Repellent Coatings: A precursor for creating durable water-repellent and anti-fouling coatings on textiles, construction materials, and optical components.
• Chromatography Stationary Phases: Used to derivatize silica gel for the preparation of reverse-phase chromatography columns (e.g., C18 phases) with specific selectivity.
• Adhesion Promoter: Enhances the bonding between dissimilar materials, such as in rubber-to-metal bonding or composite material fabrication.

Basic Information

Product Name	n-Octadecylmethoxydichlorosilane
CAS No.	211934-50-8
Molecular Formula	C19H40Cl2OSi
Molecular Weight	383.51 g/mol
Synonyms	Octadecylmethoxydichlorosilane; Dichloro(methoxy)octadecylsilane; Methoxyoctadecyldichlorosilane; Stearylmethoxydichlorosilane; C18-methoxydichlorosilane; 1-Octadecylmethoxydichlorosilane; n-Octadecyl-methoxy-dichlorosilane; Dichloro(octadecyl)methoxysilane
EINECS	Contact for details

Quality Control

Our n-Octadecylmethoxydichlorosilane is manufactured under strict quality management systems. Each batch undergoes rigorous analytical testing, including assay by GC or titration and impurity profiling, to ensure high chemical purity and consistency. A comprehensive Certificate of Analysis (COA) detailing purity, identity, and specific test results is provided with every shipment to guarantee it meets your technical requirements.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated place. Due to its hygroscopic (moisture-sensitive) nature, containers must be kept tightly sealed under an inert atmosphere (e.g., nitrogen or argon) to prevent hydrolysis. Recommended storage temperature is 2-8°C for long-term stability. Keep away from heat, sparks, open flames, and incompatible materials such as strong bases, acids, and oxidizing agents.

Specification

Item	Specification
Appearance	Colorless to pale yellow liquid
Identification (IR)	Conforms to structure
Assay (GC)	≥ 97.0%
Density (at 20°C)	~0.89 g/mL
Refractive Index (n20D)	~1.452

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