Description

1,3-Bis(Trimethylsiloxy)-1,3-Dimethyldisiloxane is a versatile organosilicon compound, specifically a disiloxane derivative, valued for its role as a key intermediate and functional modifier. Its primary commercial importance lies in its ability to introduce trimethylsiloxy groups, which can impart hydrophobicity, modify surface properties, and act as a protecting agent in complex syntheses. This chemical is essential for manufacturers and R&D teams in the silicone polymer, specialty coatings, and pharmaceutical intermediates sectors seeking to enhance product performance or develop novel materials.

Application

• Silicone Polymer Intermediate: Serves as a building block or chain extender in the synthesis of specialized silicone oils, resins, and elastomers.
• Surface Modification Agent: Used to treat inorganic fillers (like silica) to improve dispersion and compatibility in silicone rubber and sealant formulations.
• Hydrophobic Coating Precursor: Acts as a key ingredient in formulations for water-repellent coatings on textiles, glass, and construction materials.
• Pharmaceutical & Agrochemical Synthesis: Employed as a protecting group for sensitive hydroxyl functionalities during multi-step organic synthesis.
• Adhesive & Sealant Additive: Functions as a cross-linking agent or property modifier to adjust cure kinetics and final material characteristics.
• Laboratory Reagent: Utilized in research for silylation reactions to increase the volatility of compounds for GC analysis or to alter solubility.

Basic Information

Product Name	1,3-Bis(Trimethylsiloxy)-1,3-Dimethyldisiloxane
CAS No.	16066-09-4
Molecular Formula	C8H26O3Si4
Molecular Weight	282.66 g/mol
Synonyms	1,3-Dimethyl-1,3-bis(trimethylsiloxy)disiloxane; Bis(trimethylsiloxy)dimethyldisiloxane; 1,1,3,3-Tetramethyl-1,3-bis(trimethylsiloxy)disiloxane; Disiloxane, 1,3-dimethyl-1,3-bis(trimethylsiloxy)-; HMDSO derivative; TMS-protected disiloxane; Hexamethyldisiloxane, hydroxylated derivative
EINECS	240-202-1

Quality Control

Our 1,3-Bis(Trimethylsiloxy)-1,3-Dimethyldisiloxane is produced under stringent quality management systems. Each batch undergoes rigorous analytical testing, including GC, NMR, and FTIR, to ensure identity, purity, and consistency. Certificates of Analysis (COA) detailing all relevant specifications are provided with every shipment. We are committed to meeting the high standards required for industrial and research applications, with purity grades tailored to specific customer needs.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, well-ventilated area away from heat sources and open flame. Due to its highly volatile nature, ensure containers are kept tightly sealed when not in use to prevent evaporation and concentration changes. Recommended storage temperature is 2-25°C. Keep away from strong acids, bases, and oxidizing agents.

Specification

Item	Specification
Appearance	Colorless clear liquid
Identification (IR)	Conforms to structure
Assay (GC)	≥ 98.0%
Density (at 20°C)	0.85 - 0.87 g/mL
Refractive Index (n20D)	1.385 - 1.395
Water Content (KF)	≤ 0.1%

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