Description

Dodecyltrimethoxysilane is a long-chain alkyltrialkoxysilane coupling agent, a key intermediate in organosilicon chemistry. Its primary value lies in its ability to modify inorganic surfaces, imparting hydrophobic properties and improving the compatibility and adhesion between organic polymers and inorganic substrates. This makes it an essential material for manufacturers in the coatings, sealants, plastics, and composite materials industries seeking enhanced performance and durability.

Application

• As a surface modifying agent for silica, glass, and other mineral fillers to improve dispersion in polymer matrices and reduce moisture absorption.
• As a key ingredient in the formulation of water-repellent and anti-corrosion coatings for construction materials, metals, and stone.
• As a coupling agent in fiberglass-reinforced plastics and mineral-filled composites to enhance mechanical strength and interfacial bonding.
• In the synthesis of specialty silicone resins and polymers with long alkyl chains for specific release, flow, or softening properties.
• For the hydrophobic treatment of pigments and powders to prevent caking and improve handling.
• As a primer or adhesion promoter on metal, glass, or concrete surfaces before coating or sealing.

Basic Information

Product Name	Dodecyltrimethoxysilane
CAS No.	3069-21-4
Molecular Formula	C15H34O3Si
Molecular Weight	290.52 g/mol
Synonyms	Dodecyltriethoxysilane (common variant); Lauryltrimethoxysilane; n-Dodecyltrimethoxysilane; Trimethoxydodecylsilane; Dodecylsilanetriol trimethyl ether; Silane, dodecyltrimethoxy-; LTMS; Dynasylan® 9116 (Evonik); KH-311 (Shin-Etsu)
EINECS	221-304-1

Quality Control

Our Dodecyltrimethoxysilane 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 and consistent performance for industrial applications. A Certificate of Analysis (COA) detailing all relevant parameters is provided with every shipment to guarantee supply reliability and product integrity.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C/59-77°F). This product is hygroscopic (moisture-sensitive); containers must be kept tightly sealed to prevent contact with atmospheric moisture, which can lead to hydrolysis and reduced efficacy.

Specification

Item	Specification
Appearance	Colorless to pale yellow clear liquid
Identification (IR)	Conforms to structure
Assay (GC)	≥ 97.0%
Refractive Index (n20/D)	1.420 - 1.430
Density (20°C)	0.88 - 0.90 g/cm³

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