Description

Chlorooctadecylsilane is a high-purity organosilicon compound, specifically a long-chain alkylchlorosilane, widely used as a key surface modification agent. Its primary value lies in its ability to form durable, hydrophobic monolayers on various substrates, fundamentally altering surface properties for enhanced performance. This makes it an essential material for manufacturers and R&D teams in the advanced materials, nanotechnology, and specialty chemicals sectors seeking to impart water repellency, improve adhesion, or create specific surface functionalities.

Application

• Surface Modification of Silica and Glass: As a silanizing agent to create hydrophobic, low-energy surfaces on glass, quartz, and silica gels for chromatography, fillers, and reinforcements.
• Nanoparticle Functionalization: For coating metal oxide nanoparticles (e.g., SiO2, TiO2) to improve dispersion in organic matrices and prevent agglomeration.
• Self-Assembled Monolayers (SAMs): Used in research and fabrication of SAMs on silicon wafers and other hydroxylated surfaces for microelectronics, sensors, and corrosion inhibition.
• Water-Repellent Coatings: A precursor in formulating durable water-repellent (DWR) finishes for textiles, construction materials, and paper.
• Adhesion Promotion: Acts as a coupling agent to improve the bond between organic polymers and inorganic surfaces in composite materials and sealants.
• Stationary Phase Derivatization: In gas chromatography (GC) and high-performance liquid chromatography (HPLC) to create reversed-phase columns with C18 (octadecyl) chains.

Basic Information

Product Name	Chlorooctadecylsilane
CAS No.	86949-75-9
Molecular Formula	C₁₈H₃₇ClSi
Molecular Weight	317.03 g/mol
Synonyms	Octadecylchlorosilane; n-Octadecylchlorosilane; Octadecylsilyl chloride; n-Octadecyltrichlorosilane (Note: This is a distinct, common compound with three chlorines); C18-Chlorosilane; Monochlorooctadecylsilane; 1-Chlorooctadecylsilane; (Chloro)octadecylsilane
EINECS	Contact for details

Quality Control

Our Chlorooctadecylsilane is produced under strict quality management protocols. Each batch undergoes rigorous analytical testing, including Gas Chromatography (GC) and Nuclear Magnetic Resonance (NMR), to ensure high chemical purity and identity confirmation. We provide comprehensive Certificates of Analysis (COA) with every shipment, detailing assay, impurity profiles, and physical properties to meet the stringent requirements of research and industrial 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). Due to its moisture-sensitive (hygroscopic) nature, containers must be kept sealed under an inert atmosphere (e.g., nitrogen or argon) to prevent hydrolysis. Keep away from strong bases and oxidizing agents.

Specification

Item	Specification
Appearance	Colorless to pale yellow liquid
Identification (IR)	Conforms to structure
Assay (GC)	≥ 95.0%
Density (at 20°C)	~0.88 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.