Description

Dimethoxymethyl-n-Octadecylsilane is a long-chain alkylsilane coupling agent featuring both methoxy and methyl functional groups. This compound is valued for its ability to modify surface properties, imparting hydrophobicity and improving compatibility between organic and inorganic materials. It is essential for manufacturers in the coatings, plastics, and advanced materials sectors seeking to enhance product performance and durability.

Application

• Surface Modification Agent: Imparts water-repellent (hydrophobic) characteristics to glass, silica, and other mineral surfaces.
• Polymer Additive: Acts as a coupling agent and compatibilizer in polymer composites, improving filler dispersion and mechanical properties.
• Waterproofing Coatings: A key ingredient in formulations for waterproofing concrete, masonry, and textiles.
• Adhesive & Sealant Formulations: Enhances adhesion to difficult substrates and improves moisture resistance.
• Nano-material Synthesis: Used to functionalize nanoparticles like silica or metals for stable dispersion in organic matrices.
• Release Coatings: Employed in the production of release papers and films.

Basic Information

Product Name	Dimethoxymethyl-n-Octadecylsilane
CAS No.	70851-50-2
Molecular Formula	C₂₁H₄₆O₂Si
Molecular Weight	358.68 g/mol
Synonyms	Methyldimethoxyoctadecylsilane; n-Octadecylmethyldimethoxysilane; Octadecylmethyldimethoxysilane; Dimethoxymethyloctadecylsilane; C18-Methyldimethoxysilane; Silane, dimethoxymethyloctadecyl-; (Octadecyl)methyldimethoxysilane; Methyloctadecyldimethoxysilane
EINECS	Contact for details

Quality Control

Our Dimethoxymethyl-n-Octadecylsilane is manufactured under strict quality control protocols to ensure batch-to-batch consistency and high purity. We provide comprehensive Certificates of Analysis (COA) with each shipment, detailing key parameters such as assay, identity, and impurity profiles. Our quality management system is designed to meet the rigorous demands of industrial and research applications.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). This product is hygroscopic (moisture-sensitive); containers must be kept tightly sealed to prevent degradation from atmospheric moisture.

Specification

Item	Specification
Appearance	Colorless to pale yellow liquid
Identification (IR)	Conforms
Assay (GC)	≥ 97.0%
Density (20°C)	~0.86 g/mL
Refractive Index (n20/D)	~1.438

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