Description

Hexamethyl Diorthosilicate is a highly volatile organosilicon compound, also known as hexamethoxydisilane. This chemical serves as a versatile and reactive silicon source, prized for its ability to introduce silicon-oxygen frameworks under controlled conditions. It is primarily utilized in advanced material synthesis, including the production of silica-based coatings, specialty glass precursors, and as a key reagent in semiconductor and microelectronics manufacturing processes where precise silicon deposition is critical.

Application

• Semiconductor & Microelectronics: As a precursor for chemical vapor deposition (CVD) and atomic layer deposition (ALD) processes to create thin silicon oxide (SiOx) films.
• Advanced Ceramics & Glass: A key starting material in the sol-gel synthesis of high-purity silica glasses and ceramic composites.
• Surface Modification & Coatings: Used to create hydrophobic, protective, or adhesion-promoting siloxane-based surface layers on various substrates.
• Silicon Polymer Synthesis: Acts as a building block or cross-linking agent in the production of specialized polysiloxanes and silicone resins.
• Catalyst & Reagent: Employed in organic synthesis as a silylating agent or as a reagent for introducing silicon into molecular structures.
• Research & Development: Utilized in laboratories for developing new silicon-containing materials and nanotechnology applications.

Basic Information

Product Name	Hexamethyl Diorthosilicate
CAS No.	4371-91-9
Molecular Formula	C6H18O6Si2
Molecular Weight	242.38 g/mol
Synonyms	Hexamethoxydisilane; Bis(trimethoxysilyl) ether; Disiloxane, hexamethoxy-; 1,1,1,3,3,3-Hexamethoxydisiloxane; Silane, 1,1',1''-[(disiloxanylidene)tris(oxy)]tris[1,1,1-trimethoxy-; HMDSO (ambiguous, can refer to Hexamethyldisiloxane); Silicon Methoxide Dimer
EINECS	224-480-5

Quality Control

Our Hexamethyl Diorthosilicate is manufactured under strict quality management systems. Each batch undergoes rigorous analytical testing, including Gas Chromatography (GC) and FT-IR spectroscopy, to ensure high purity and consistency. A comprehensive Certificate of Analysis (COA) detailing assay, identity, and impurity profiles is provided with every shipment to guarantee it meets the stringent requirements of advanced material and electronics applications.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, well-ventilated area away from heat sources and incompatible materials. Due to its highly volatile nature, ensure containers are kept tightly sealed when not in use to prevent evaporation and moisture ingress. Recommended storage temperature is 2-8°C for extended stability, though short-term storage at controlled room temperature (15-25°C) is acceptable.

Specification

Item	Specification
Appearance	Colorless to pale yellow liquid
Identification (IR)	Conforms to structure
Assay (GC)	≥ 98.0%
Density (20°C)	1.02 - 1.06 g/cm³
Refractive Index (n20D)	1.368 - 1.372
Moisture (Karl Fischer)	≤ 0.1%

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