Description

Hexamethoxydisilane is a versatile organosilicon compound with the CAS number 5851-07-0, serving as a key building block in advanced material synthesis. Its value lies in its ability to act as a highly reactive precursor for introducing silicon-oxygen frameworks, enabling precise control over material properties. This chemical is essential for manufacturers and R&D teams in the electronics, coatings, and specialty chemical industries seeking to develop high-performance siloxane polymers, surface modifiers, and inorganic-organic hybrid materials.

Application

• Precursor for Silicone Resins & Polymers: Used in the synthesis of specialized silicone resins for high-temperature coatings, release agents, and encapsulants.
• Surface Modification Agent: Imparts hydrophobic or specific functional properties to glass, silica, and metal oxide surfaces.
• Sol-Gel Chemistry: A critical reagent for producing high-purity silicon dioxide (SiO₂) films, aerogels, and other inorganic-organic hybrid materials via hydrolysis and condensation reactions.
• Electronics & Semiconductor Manufacturing: Employed in chemical vapor deposition (CVD) or as a spin-on dielectric (SOD) precursor for thin film insulation layers.
• Adhesive & Sealant Formulations: Functions as a cross-linking agent or modifier to enhance the thermal stability and adhesion properties of sealants.
• Pharmaceutical & Agrochemical Intermediates: Serves as a protected silicon reagent in the synthesis of complex molecules.

Basic Information

Product Name	Hexamethoxydisilane
CAS No.	5851-07-0
Molecular Formula	C6H18O6Si2
Molecular Weight	242.38 g/mol
Synonyms	Disiloxane, hexamethoxy-; Hexamethoxydisiloxane; HMDSO; Bis(trimethoxysilyl) ether; 1,1,1,3,3,3-Hexamethoxydisiloxane; Oxybis(trimethyl orthosilicate); Tetramethyl ester of silicic acid, polymer with orthosilicic acid tetraethyl ester
EINECS	227-491-1

Quality Control

Our Hexamethoxydisilane is produced under stringent quality management systems. Each batch undergoes rigorous analytical testing, including gas chromatography (GC) and nuclear magnetic resonance (NMR), to ensure high purity and consistency. Certificates of Analysis (COA) detailing purity, identity, and impurity profiles are provided with every shipment to support your quality assurance and regulatory compliance needs.

Storage

Preserve in a tightly closed container, protected from light. Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed under a dry, inert atmosphere (e.g., nitrogen or argon) to prevent hydrolysis. Store in a cool, dry, well-ventilated area at room temperature (15-25°C/59-77°F). Keep away from heat, sparks, open flames, and incompatible materials such as strong acids and bases.

Specification

Item	Specification
Appearance	Colorless to pale yellow liquid
Identification (IR)	Conforms to structure
Assay (GC)	≥ 98.0%
Density (at 20°C)	1.05 - 1.10 g/cm³
Refractive Index (n20D)	1.370 - 1.380
Water Content (Karl Fischer)	≤ 0.1%

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