Description

Dimethyloctadecylsilane is a high-purity organosilicon compound characterized by a long alkyl chain. This structure makes it a valuable hydrophobic agent and surface modifier, providing excellent water repellency and release properties. It is essential for manufacturers in the coatings, polymers, and personal care industries seeking to enhance material performance. The compound is supplied under strict quality control to ensure batch-to-batch consistency for demanding industrial applications.

Application

• As a key hydrophobic agent and water repellent in surface treatments for textiles, paper, and construction materials.
• As a surface modifier for silica and other inorganic fillers to improve dispersion and compatibility in polymer composites.
• As an intermediate in the synthesis of more complex silane coupling agents and specialty silicone fluids.
• In the formulation of release coatings and anti-adhesive layers for industrial and packaging applications.
• As a precursor for creating self-assembled monolayers (SAMs) on various substrates for research and specialized coatings.
• In personal care products as a conditioning agent and emollient, providing a smooth, non-greasy feel.

Basic Information

Product Name	Dimethyloctadecylsilane
CAS No.	32395-58-7
Molecular Formula	C₂₀H₄₄Si
Molecular Weight	312.66 g/mol
Synonyms	Octadecyldimethylsilane; Dimethyl-n-octadecylsilane; n-Octadecyldimethylsilane; Dimethyl(octadecyl)silane; Silane, dimethyloctadecyl-; 1-Octadecyldimethylsilane; Dimethylstearylsilane; Stearyldimethylsilane
EINECS	251-027-5

Quality Control

Our Dimethyloctadecylsilane is manufactured under a cGMP-compliant quality management system. Each batch undergoes rigorous analytical testing, including GC, NMR, and Karl Fischer titration, to ensure it meets stringent purity and identity specifications. A comprehensive Certificate of Analysis (COA) detailing all test results is provided with every shipment to guarantee traceability and compliance with your technical requirements.

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). Due to its hygroscopic and highly volatile nature, the container must be kept tightly sealed under an inert atmosphere (e.g., nitrogen or argon) after opening to prevent moisture absorption and degradation. Keep away from heat, sparks, and open flame.

Specification

Item	Specification
Appearance	Colorless to pale yellow liquid
Identification (IR)	Conforms to structure
Assay (GC)	≥ 97.0%
Water Content (KF)	≤ 0.1%
Density (at 20°C)	0.78 - 0.82 g/mL
Refractive Index (n20D)	1.440 - 1.445

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