Description

Chlorodimethyloctadecylsilane is a high-purity organosilicon compound, specifically a long-chain alkylchlorosilane, widely used as a key intermediate and surface modifying agent. Its primary value lies in its ability to impart durable hydrophobic and oleophobic properties to inorganic substrates, enhancing material performance and stability. This product is essential for manufacturers and R&D teams in the specialty chemicals, advanced materials, and surface treatment industries seeking to modify surface energy and reactivity.

Application

• Surface Modification Agent: A crucial precursor for synthesizing hydrophobic coatings on glass, silica, metals, and other inorganic materials.
• Silicone Intermediate: Used in the production of specialty silicone oils, resins, and elastomers where long alkyl chains are required for specific compatibility or lubricity.
• Coupling Agent: Functions as an effective coupling agent to improve the adhesion between organic polymers and inorganic fillers in composite materials.
• Water Repellents: Formulated into durable water repellents (DWR) for textiles, leather, and construction materials.
• Chromatography: Employed in the derivatization of stationary phases for gas chromatography (GC) and high-performance liquid chromatography (HPLC) to alter selectivity.
• Nano-particle Capping: Used to functionalize and stabilize metal oxide nanoparticles, preventing aggregation and tailoring surface properties.
• Release Coatings: A key component in the synthesis of silicone-based release liners for pressure-sensitive adhesives.
• Research & Development: Serves as a valuable building block in organic and organometallic synthesis for academic and industrial research.

Basic Information

Product Name	Chlorodimethyloctadecylsilane
CAS No.	18643-08-8
Molecular Formula	C₂₀H₄₃ClSi
Molecular Weight	347.10 g/mol
Synonyms	Octadecyldimethylchlorosilane; Dimethyloctadecylchlorosilane; n-Octadecyldimethylchlorosilane; ODS-Cl; ODMCS; C18-Dimethylchlorosilane; Chloro(dimethyl)octadecylsilane; Silane, chlorodimethyloctadecyl-
EINECS	242-457-4

Quality Control

Our Chlorodimethyloctadecylsilane is manufactured under strict quality management systems. Each batch undergoes rigorous analytical testing, including Gas Chromatography (GC) and Nuclear Magnetic Resonance (NMR), to ensure high purity and consistent performance. A comprehensive Certificate of Analysis (COA) detailing identity, assay, and impurity profiles is provided with every shipment to guarantee compliance with your specifications and industry standards.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). This material is hygroscopic (moisture-sensitive) and reacts with strong acids/organic solvents; keep the container tightly sealed under an inert atmosphere (nitrogen/argon) for long-term storage to prevent hydrolysis. Isolate from incompatible materials such as strong oxidizers, bases, and water.

Specification

Item	Specification
Appearance	Colorless to pale yellow liquid
Identification (IR)	Conforms to structure
Assay (GC)	≥ 97.0%
Density (at 20°C)	0.86 - 0.88 g/mL
Refractive Index (n20/D)	1.450 - 1.455

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