Description

1,1,3,3-Tetramethyl-1,3-Diethoxydisiloxane is a versatile organosilicon compound, specifically a disiloxane derivative with ethoxy and methyl substituents. Its primary value lies in its dual functionality as both a reactive silane and a flexible spacer, making it a crucial building block in advanced material synthesis. This chemical is essential for manufacturers in the silicone polymer, specialty coatings, and electronics industries seeking to modify surface properties or create hybrid organic-inorganic networks. Its controlled reactivity allows for precise tuning of material characteristics such as hydrophobicity, adhesion, and thermal stability.

Application

• Silicone Resin & Polymer Modification: Acts as a cross-linking agent or chain extender to enhance flexibility, thermal stability, and weather resistance in silicone elastomers and resins.
• Surface Treatment & Coupling Agent: Used to functionalize inorganic surfaces (glass, silica, metals) to improve adhesion and compatibility with organic polymers in composite materials.
• Precursor for Hybrid Materials: Serves as a key monomer in sol-gel processes for producing high-purity silicon oxide coatings, optical materials, and mesoporous sieves.
• Electronics & Semiconductor Industry: Employed in spin-on dielectric (SOD) formulations and as a passivation layer precursor for microelectronic devices.
• Hydrophobic Coatings: Imparts water-repellent properties to surfaces in construction, automotive, and textile applications.
• Adhesive & Sealant Formulations: Enhances bonding strength and environmental durability in high-performance adhesives and sealants.
• Pharmaceutical & Cosmetic Intermediates: Used in the synthesis of specialized silicone-based ingredients for controlled-release systems and personal care products.

Basic Information

Product Name	1,1,3,3-Tetramethyl-1,3-Diethoxydisiloxane
CAS No.	18420-09-2
Molecular Formula	C10H28O3Si2
Molecular Weight	252.50 g/mol
Synonyms	1,3-Diethoxy-1,1,3,3-tetramethyldisiloxane; Bis(ethoxydimethylsilyl) ether; Diethoxytetramethyldisiloxane; Tetramethyldiethoxydisiloxane; Ethoxy-terminated polydimethylsiloxane dimer; DEMS; EINECS 242-306-8
EINECS	242-306-8

Quality Control

Our 1,1,3,3-Tetramethyl-1,3-Diethoxydisiloxane is manufactured under strict quality management systems to ensure batch-to-batch consistency and high purity. We employ advanced analytical techniques, including gas chromatography (GC) and nuclear magnetic resonance (NMR) spectroscopy, to verify chemical identity and purity. Certificates of Analysis (COA) detailing all relevant specifications are provided with each shipment. For customers with specific regulatory needs, we can support documentation requirements for applications under REACH and other global chemical inventories.

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). This product is hygroscopic (moisture-sensitive). Keep the container tightly sealed under a dry inert atmosphere (e.g., nitrogen or argon) to prevent hydrolysis and maintain product integrity. Keep away from heat, sparks, and open flame.

Specification

Item	Specification
Appearance	Colorless to pale yellow clear liquid
Identification (IR)	Conforms to structure
Assay (GC)	≥ 98.0%
Water Content (KF)	≤ 0.1%
Refractive Index (n20/D)	1.385 - 1.395
Density (20°C)	0.86 - 0.90 g/mL

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