Description

Trimethoxyoctylsilane is a versatile organosilicon compound, specifically an alkyltrialkoxysilane coupling agent. Its primary value lies in its ability to modify surfaces and act as a crosslinking agent, creating durable bonds between organic polymers and inorganic substrates. This product is essential for industries requiring enhanced adhesion, water repellency, and surface compatibility, such as sealants, coatings, and composite materials.

Application

• As a coupling agent in mineral-filled composites (e.g., glass fiber, silica, clay) to improve mechanical properties and dispersion.
• A key intermediate for the synthesis of specialty silane-modified polymers (SMP) and resins used in high-performance sealants and adhesives.
• Surface treatment agent for nanoparticles and pigments to enhance compatibility with organic matrices and prevent agglomeration.
• Hydrophobic modification of construction materials like concrete and stone to impart water repellency.
• Primer or adhesion promoter in coatings and paints for challenging substrates like metals, glass, and plastics.
• Used in the manufacture of silicone resins and crosslinkers for various industrial applications.
• Research and development of novel hybrid organic-inorganic materials (ORMOSILs).

Basic Information

Product Name	Trimethoxyoctylsilane
CAS No.	3069-40-7
Molecular Formula	C11H26O3Si
Molecular Weight	234.41 g/mol
Synonyms	n-Octyltrimethoxysilane; Octyltrimethoxysilane; Trimethoxy(octyl)silane; n-Octyltrimethoxysilane; OTMS; Octyltriethoxysilane (common misnomer, verify structure); Silane, trimethoxyoctyl-; 1-Octyltrimethoxysilane
EINECS	221-317-6

Quality Control

Our Trimethoxyoctylsilane is manufactured under a strict quality management system. Each batch undergoes rigorous analytical testing, including Gas Chromatography (GC) and FTIR spectroscopy, to ensure high purity and consistent performance. Certificates of Analysis (COA) detailing purity, identity, and key physical properties are provided with every shipment to guarantee compliance with your technical requirements.

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). Due to its moisture-sensitive (hygroscopic) nature, containers must be kept tightly sealed under a dry inert atmosphere (e.g., nitrogen) after opening to prevent hydrolysis and maintain product integrity.

Specification

Item	Specification
Appearance	Clear, colorless to pale yellow liquid
Identification (IR)	Conforms to structure
Assay (GC)	≥ 97.0%
Density (at 20°C)	0.88 - 0.92 g/cm³
Refractive Index (n20D)	1.410 - 1.415
Moisture (Karl Fischer)	≤ 0.5%

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