Description

Trimethyl(Octadecyloxy)Silane is a high-purity organosilicon compound, also known as Octadecyloxytrimethylsilane, with the CAS registry number 18748-98-6. This specialty chemical serves as a critical surface modification agent and hydrophobic intermediate, enabling precise control over material properties. It is essential for manufacturers and R&D facilities in the coatings, polymers, and advanced materials sectors seeking to enhance product performance through tailored surface chemistry.

Application

• Surface Modification Agent: Used to impart hydrophobic and oleophobic properties to glass, silica, metals, and other inorganic substrates.
• Polymer Additive: Acts as a coupling agent and internal lubricant in silicone rubber, plastics, and composite materials to improve processing and surface characteristics.
• Nanomaterial Functionalization: A key reagent for modifying nanoparticles (e.g., silica, titania) to control dispersion and compatibility in organic matrices.
• Release Coatings: Employed as a precursor in the formulation of non-stick and easy-release coatings for industrial and consumer applications.
• Adhesive & Sealant Formulations: Enhances adhesion to low-energy surfaces and provides moisture resistance in high-performance sealants and adhesives.
• Textile & Leather Treatment: Used to create durable water-repellent (DWR) finishes on fabrics and leather goods.
• Pharmaceutical & Cosmetic Intermediates: Serves as a building block in the synthesis of specialty silicones for controlled-release systems and personal care products.
• Research & Development: A valuable tool in academic and industrial R&D for studying self-assembled monolayers (SAMs) and surface science.

Basic Information

Product Name	Trimethyl(Octadecyloxy)Silane
CAS No.	18748-98-6
Molecular Formula	C₂₁H₄₆OSi
Molecular Weight	342.68 g/mol
Synonyms	Octadecyloxytrimethylsilane; Trimethyloctadecyloxysilane; n-Octadecyloxytrimethylsilane; Stearyloxytrimethylsilane; Silane, trimethyl(octadecyloxy)-; (Octadecyloxy)trimethylsilane; OTS (common abbreviation); OTS-18
EINECS	242-558-9

Quality Control

Our Trimethyl(Octadecyloxy)Silane is manufactured under strict quality management systems. Each batch undergoes rigorous analytical testing, including Gas Chromatography (GC) and Nuclear Magnetic Resonance (NMR), to ensure high purity and consistent performance. A comprehensive Certificate of Analysis (COA) detailing identity, purity, and impurity profiles is provided with every shipment to support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). Keep away from strong acids, bases, and oxidizing agents. The product is moisture-sensitive; keep containers tightly sealed when not in use.

Specification

Item	Specification
Appearance	Colorless to pale yellow liquid
Identification (IR)	Conforms to structure
Assay (GC)	≥ 97.0%
Density (at 20°C)	0.84 - 0.86 g/mL
Refractive Index (n20D)	1.440 - 1.445

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