Description

Trimethylsiloxytriethoxysilane is a versatile organosilicon compound that functions as a bifunctional coupling agent and surface modifier. Its unique molecular structure, featuring both hydrolyzable ethoxy groups and a stable trimethylsiloxy group, makes it a critical intermediate for enhancing material compatibility and adhesion. This product is essential for manufacturers in the silicone resins, adhesives, and specialty coatings industries seeking to improve the performance and durability of their formulations.

Application

• As a key intermediate in the synthesis of silicone resins and modified siloxane polymers.
• As a coupling agent and adhesion promoter in silicone-based sealants, adhesives, and coatings.
• For surface treatment of inorganic fillers (e.g., silica, glass fibers) to improve dispersion and compatibility in organic polymer matrices.
• As a crosslinking agent or chain extender in the production of specialty silicone elastomers.
• In the formulation of water repellents and protective surface treatments for construction materials.
• As a precursor for creating functionalized silanes with specific organic modifications.
• For research and development of novel hybrid organic-inorganic materials (ORMOSILs).

Basic Information

Product Name	Trimethylsiloxytriethoxysilane
CAS No.	17861-35-7
Molecular Formula	C9H24O4Si2
Molecular Weight	252.46 g/mol
Synonyms	Triethoxysilyloxytrimethylsilane; Trimethylsilyl Triethoxysilane; 1,1,1-Trimethyl-3-triethoxysiloxysilane; (Triethoxysilyloxy)trimethylsilane; Silane, triethoxy(trimethylsiloxy)-; NSC 163229; Trimethylsiloxy Triethoxysilane; Trimethyl(triethoxysiloxy)silane
EINECS	241-806-5

Quality Control

Our Trimethylsiloxytriethoxysilane is manufactured under strict quality management systems to ensure batch-to-batch consistency and high purity. Each lot undergoes comprehensive analytical testing, including gas chromatography (GC) for assay and purity, and Karl Fischer titration for moisture content. A detailed Certificate of Analysis (COA) is provided with every shipment, confirming compliance with agreed specifications.

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). Keep the container tightly sealed under a dry inert atmosphere (e.g., nitrogen) to prevent hydrolysis and degradation upon contact with atmospheric moisture.

Specification

Item	Specification
Appearance	Colorless to pale yellow clear liquid
Identification (IR)	Conforms to structure
Assay (GC)	≥ 97.0%
Water Content (KF)	≤ 0.5%
Refractive Index (n20/D)	1.380 - 1.390
Density (20°C)	0.92 - 0.96 g/mL

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