Description

Tetramethyl Orthosilicate is a versatile organosilicon compound primarily used as a cross-linking agent and a source of silica. Its high reactivity and purity make it a critical precursor in the synthesis of advanced materials, offering precise control over final product properties. This chemical is essential for manufacturers in the electronics, coatings, and specialty chemical industries seeking to enhance material performance and durability.

Application

• Silica Sol and Aerogel Production: Acts as a key silicon source for creating high-purity, nanostructured silica materials used in insulation, catalysts, and composites.
• Protective and Hard Coatings: Used in sol-gel processes to formulate scratch-resistant, anti-reflective, and corrosion-protective coatings for optical lenses, displays, and metals.
• Adhesives and Sealants: Serves as a cross-linking agent to improve the thermal stability, weather resistance, and bonding strength of silicone-based formulations.
• Electronic Encapsulation and Passivation: Employed in the semiconductor industry to deposit thin silica films for device insulation and surface protection.
• Catalyst and Zeolite Synthesis: Functions as a templating agent or silicon donor in the manufacture of molecular sieves and heterogeneous catalysts.
• Fiber Optics and Waveguides: Utilized in the production of high-purity glass preforms and planar lightwave circuits.
• Surface Modification: Used to introduce silica-like layers or functional groups onto organic and inorganic substrates to alter surface properties.
• Research & Development: Serves as a fundamental reagent in organic and inorganic synthesis laboratories for developing new silicon-based polymers and ceramics.

Basic Information

Item	Details
Product Name	Tetramethyl Orthosilicate
CAS No.	681-84-5
Molecular Formula	C4H12O4Si
Molecular Weight	152.22 g/mol
Synonyms	Tetramethoxysilane (TMOS); Methyl Orthosilicate; Silicon(IV) Methoxide; Tetramethyl Silicate; Orthosilicic Acid Tetramethyl Ester; Tetramethyl Ester of Silicic Acid; Dynasil® M (Trade Name); A-1634 (Trade Name)
EINECS	211-656-4

Quality Control

Our Tetramethyl Orthosilicate is produced under stringent quality management systems. Each batch undergoes rigorous analytical testing, including Gas Chromatography (GC) for purity and identity verification, to ensure it meets exacting industry standards. Certificates of Analysis (COA) with full traceability are provided for every shipment, guaranteeing consistent quality and reliable performance for your critical applications.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area away from heat and ignition sources. Due to its hygroscopic and highly volatile nature, the container must be kept tightly sealed under an inert atmosphere (e.g., nitrogen) to prevent moisture absorption and decomposition. Recommended storage temperature is 2-25°C.

Specification

Item	Specification
Appearance	Colorless clear liquid
Identification (IR)	Conforms
Assay (GC)	≥ 99.0 %
Density (20°C)	1.020 - 1.030 g/cm³
Refractive Index (n20D)	1.368 - 1.372
Water Content (Karl Fischer)	≤ 0.1 %
Acidity (as HCl)	≤ 0.05 %

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