Description

Dichloro-Methyl-Octadecylsilane is a high-purity organosilicon compound, specifically a long-chain alkylchlorosilane. This chemical is a critical intermediate and surface modifying agent, valued for its ability to impart hydrophobic properties and create covalent bonds with inorganic substrates. It is essential for manufacturers in the advanced materials, coatings, and electronics sectors seeking to modify surface energy and enhance material performance.

Application

• Surface Modification Agent: Used to create hydrophobic, oleophobic, and self-cleaning surfaces on glass, silica, metals, and other inorganic materials.
• Silane Coupling Agent: Acts as a molecular bridge to improve adhesion between organic polymers (e.g., plastics, rubbers) and inorganic fillers (e.g., glass fibers, minerals) in composite materials.
• Chemical Intermediate: Serves as a key precursor in the synthesis of more complex organosilicon compounds, silicone resins, and specialty polymers.
• Nanomaterial Functionalization: Employed to modify the surface of nanoparticles (e.g., silica, quantum dots) to control dispersion and compatibility in various matrices.
• Waterproofing Treatments: Formulated into coatings and treatments for textiles, leather, paper, and construction materials to provide water repellency.
• Release Coatings & Molding Agents: Used in the production of release liners and as internal mold release agents for plastics and elastomers.
• Chromatography Stationary Phases: Functionalizes silica gel to create reversed-phase columns for analytical and preparative HPLC.
• Adhesion Promoter: Enhances the bonding of paints, inks, and adhesives to difficult-to-bond substrates like metals and treated plastics.

Basic Information

Product Name	Dichloro-Methyl-Octadecylsilane
CAS No.	5157-75-5
Molecular Formula	C19H40Cl2Si
Molecular Weight	367.51 g/mol
Synonyms	Octadecylmethyldichlorosilane; Methyloctadecyldichlorosilane; Dichloro(methyl)octadecylsilane; n-Octadecylmethyldichlorosilane; Dichloromethyloctadecylsilane; 1-Octadecanol, 1-[(dichloromethylsilyl)oxy]-; Silane, dichloromethyloctadecyl-; C18-Alkylmethyldichlorosilane
EINECS	225-912-1

Quality Control

Our Dichloro-Methyl-Octadecylsilane is manufactured under strict quality management systems. Each batch undergoes rigorous analytical testing, including GC, NMR, and titration methods, to ensure high purity and consistent performance. Certificates of Analysis (COA) detailing purity, identity, and impurity profiles are 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, well-ventilated area at room temperature (15-25°C). Due to its hygroscopic (moisture-sensitive) nature, containers must be kept tightly sealed under an inert atmosphere (e.g., nitrogen or argon) after opening to prevent hydrolysis. Keep away from moisture, strong bases, and oxidizing agents.

Specification

Item	Specification
Appearance	Colorless to pale yellow clear liquid
Identification (IR)	Conforms to structure
Assay (GC)	≥ 97.0%
Density (at 20°C)	0.88 - 0.92 g/mL
Refractive Index (n20/D)	1.452 - 1.458
Chloride Content (Titration)	18.5 - 20.0 %

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