Description

n-Octadecyltriethoxysilane is a long-chain alkyltrialkoxysilane coupling agent, also known as octadecyltrimethoxysilane. This organosilicon compound is valued for its ability to impart hydrophobic and oleophobic properties to inorganic surfaces, enhancing compatibility with organic polymers. It is primarily used by formulators and manufacturers in the coatings, plastics, and composites industries to improve adhesion, dispersion, and moisture resistance in their products.

Application

• Surface Modification Agent: Used to hydrophobically treat silica, glass, and other mineral fillers to improve their compatibility with polymer matrices.
• Adhesion Promoter: Enhances the bonding between inorganic substrates (like glass or metals) and organic resins in coatings, sealants, and adhesives.
• Filler Treatment: A key coupling agent for surface-treating calcium carbonate, talc, and other fillers used in plastic and rubber composites to increase mechanical strength and reduce water absorption.
• Water Repellents: Formulated into masonry and concrete sealers to provide long-lasting water repellency and protection against weathering.
• Release Coatings: Employed as a component in mold release formulations for plastics and rubber manufacturing.
• Nanomaterial Functionalization: Used to modify the surface of nanoparticles (e.g., silica, titania) to prevent agglomeration and facilitate dispersion in various media.

Basic Information

Product Name	n-Octadecyltriethoxysilane
CAS No.	7399-00-0
Molecular Formula	C24H52O3Si
Molecular Weight	416.76 g/mol
Synonyms	Octadecyltriethoxysilane; Octadecyltrimethoxysilane; n-Octadecyltrimethoxysilane; Stearyltrimethoxysilane; n-Stearyltrimethoxysilane; Triethoxy(octadecyl)silane; Trimethoxy(octadecyl)silane; ODS; OTS
EINECS	230-985-7

Quality Control

Our n-Octadecyltriethoxysilane is manufactured under strict quality management systems. Each batch undergoes rigorous analytical testing, including gas chromatography (GC) for purity and identity confirmation, to ensure it meets precise specifications. A Certificate of Analysis (COA) detailing all test results is provided with every shipment to guarantee consistent quality and performance for your applications.

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); containers must be kept tightly sealed to prevent contact with atmospheric moisture.

Specification

Item	Specification
Appearance	Colorless to pale yellow liquid
Identification (IR)	Conforms to structure
Assay (GC)	≥ 97.0%
Refractive Index (n20D)	1.435 - 1.445
Density (20°C)	0.88 - 0.90 g/mL

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