Description

n-Octadecylsilane is a high-purity organosilicon compound, specifically a long-chain alkylsilane, widely used as a versatile surface modification agent and chemical intermediate. Its primary value lies in its ability to impart hydrophobic and oleophobic properties to inorganic substrates, enhancing material performance and stability. This product is essential for manufacturers and R&D teams in the advanced materials, coatings, and electronics industries seeking to engineer surfaces with specific functional characteristics.

Application

• Surface Modification Agent: Used to create hydrophobic, self-assembled monolayers (SAMs) on glass, silica, metals, and other oxides for anti-fouling, anti-corrosion, and easy-clean coatings.
• Silica & Nanoparticle Functionalization: A key reagent for grafting long alkyl chains onto silica gels, fumed silica, and other nanoparticles to control dispersibility in organic matrices for composites, rubbers, and plastics.
• Chromatography Stationary Phases: Serves as a derivatization agent to produce reversed-phase (C18) silica for HPLC columns, enabling the separation of non-polar analytes.
• Adhesion Promoter & Coupling Agent: Improves the interfacial adhesion between organic polymers and inorganic fillers or substrates in composite materials and sealants.
• Electronics & Semiconductor Processing: Employed in the surface passivation of silicon wafers and micro-electromechanical systems (MEMS) to control surface energy and reduce stiction.
• Research & Chemical Synthesis: Acts as a crucial building block or protecting group in organic and organometallic synthesis for advanced material development.

Basic Information

Product Name	n-Octadecylsilane
CAS No.	18623-11-5
Molecular Formula	C₁₈H₃₈Si
Molecular Weight	282.59 g/mol
Synonyms	Octadecylsilane; n-Octadecylsilane; Octadecyl silane; Stearylsilane; C18-Silane; n-Octadecylmonosilane; 1-Octadecylsilane; Octadecylhydridosilane; Monooctadecylsilane
EINECS	242-449-8

Quality Control

Our n-Octadecylsilane is manufactured under strict quality management systems. Each batch undergoes rigorous analytical testing, including GC, NMR, and Karl Fischer titration, to ensure high purity and consistency. A comprehensive Certificate of Analysis (COA) detailing identity, assay, and impurity profiles is provided with every shipment to support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated place at room temperature (15-25°C). This material is hygroscopic (moisture-sensitive) and should be handled under an inert atmosphere (e.g., nitrogen or argon) to prevent oxidation and hydrolysis. Keep away from strong acids, bases, and oxidizing agents.

Specification

Item	Specification
Appearance	Colorless to pale yellow liquid or low-melting solid
Identification (IR)	Conforms to structure
Assay (GC)	≥ 97.0%
Water Content (KF)	≤ 0.1%

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