Description

1,7-Dichlorooctamethyltetrasiloxane is a versatile organosilicon compound, specifically a linear chlorosiloxane, that serves as a critical intermediate in silicone chemistry. Its value lies in its reactive chlorosilane end groups, which enable controlled chain extension and functionalization to create a wide range of modified siloxane polymers. This chemical is essential for manufacturers and R&D laboratories in the silicone, specialty chemical, and advanced materials sectors seeking to synthesize custom siloxane structures with specific properties.

Application

• Silicone Intermediate: A key building block for the synthesis of linear and branched polydimethylsiloxanes (PDMS) and other silicone polymers via controlled hydrolysis and condensation reactions.
• Surface Modification Agent: Used to impart hydrophobic or release properties to surfaces, including textiles, paper, and inorganic fillers like silica.
• Coupling Agent Precursor: Serves as a starting material for producing silane coupling agents with specific organic functionalities for composite materials and adhesives.
• Specialty Silicone Fluids: Enables the production of custom silicone oils and fluids with tailored molecular weights and viscosities for lubricants, damping fluids, and heat transfer media.
• Research & Development: A valuable reagent in academic and industrial R&D for exploring new silicone-based copolymers, elastomers, and hybrid organic-inorganic materials.
• Crosslinking Agent: Functions as a reactive crosslinker in the formulation of certain silicone resins and elastomers, contributing to network formation.

Basic Information

Product Name	1,7-Dichlorooctamethyltetrasiloxane
CAS No.	2474-02-4
Molecular Formula	C8H24Cl2O3Si4
Molecular Weight	351.54 g/mol
Synonyms	Octamethyl-1,7-dichlorotetrasiloxane; Dichlorooctamethyltetrasiloxane; 1,7-Dichloro-octamethyl-tetrasiloxane; Tetrasiloxane, 1,7-dichlorooctamethyl-; Chlorosiloxane; Linear chlorosiloxane; DCTS; DCOTS
EINECS	219-598-6

Quality Control

Our 1,7-Dichlorooctamethyltetrasiloxane is manufactured under strict quality protocols to ensure batch-to-batch consistency and high purity. Quality is verified through comprehensive analytical testing, including gas chromatography (GC), nuclear magnetic resonance (NMR), and titration methods to confirm identity, assay, and impurity profiles. Certificates of Analysis (COA) detailing all test results are provided with each shipment to support your quality assurance and regulatory needs.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). This material is hygroscopic (moisture-sensitive) and reacts with moisture to release hydrogen chloride. Keep container tightly sealed under an inert atmosphere (e.g., nitrogen or argon) when not in use. Store away from strong acids, bases, and oxidizing agents.

Specification

Item	Specification
Appearance	Colorless to pale yellow liquid
Identification (IR)	Conforms to reference spectrum
Assay (GC)	≥ 97.0%
Chlorine Content	19.8 - 20.5 %
Density (at 25°C)	1.07 - 1.09 g/mL
Refractive Index (n20D)	1.405 - 1.410

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