Description

n-Octadecyltrichlorosilane is a long-chain organosilicon compound that serves as a key coupling agent and surface modifier. Its primary value lies in its ability to form durable, hydrophobic, and self-assembled monolayers on various inorganic substrates, fundamentally altering surface properties. This makes it an essential material for manufacturers in the electronics, nanotechnology, and advanced materials sectors seeking to enhance performance, adhesion, and corrosion resistance.

Application

• Surface Modification: Creation of hydrophobic, oleophobic, and anti-adhesive coatings on glass, silicon wafers, metals, and ceramics.
• Nanotechnology & Self-Assembled Monolayers (SAMs): Used as a precursor for constructing ordered molecular films on surfaces for sensors, microelectromechanical systems (MEMS), and research.
• Adhesion Promotion: Acts as a coupling agent to improve the bond between inorganic fillers (like silica) and organic polymer matrices in composites and sealants.
• Electronics & Semiconductor Manufacturing: Applied in the passivation and functionalization of surfaces to control wettability and electrical properties.
• Chromatography: Used to derivatize silica gel for reverse-phase chromatography columns.
• Corrosion Inhibition: Forms protective layers on metal surfaces to prevent oxidation and degradation.

Basic Information

Product Name	n-Octadecyltrichlorosilane
CAS No.	112-04-9
Molecular Formula	C18H37Cl3Si
Molecular Weight	387.93 g/mol
Synonyms	Octadecyltrichlorosilane; OTS; Trichloro(octadecyl)silane; Stearyltrichlorosilane; n-Octadecyltrichlorosilane; 1-Octadecanol, trichloro derivative; Silane, trichlorooctadecyl-; ATS (Alkyltrichlorosilane); OTS-18; OTS SAM precursor
EINECS	203-930-7

Quality Control

Our n-Octadecyltrichlorosilane is manufactured under stringent quality management systems. Each batch undergoes rigorous analytical testing, including Gas Chromatography (GC) and FT-IR spectroscopy, to ensure high purity and consistency. A comprehensive Certificate of Analysis (COA) detailing assay, identity, and impurity profiles is provided with every shipment to guarantee compliance with your technical requirements.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at 2-8°C (refrigerated) or as specified on the label. This material is highly volatile and hygroscopic (moisture-sensitive). Keep away from heat, sparks, open flames, and strong acids/bases. Use under an inert atmosphere (argon or nitrogen) to prevent hydrolysis and degradation.

Specification

Item	Specification
Appearance	Colorless to pale yellow liquid
Identification (IR)	Conforms to structure
Assay (GC)	≥ 97.0%
Density (at 25°C)	0.98 - 1.00 g/mL
Refractive Index (n20D)	1.458 - 1.462
Chloride Content	27.0 - 28.0 %

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