Description

1,3-Dichlorotetramethyldisiloxane is a versatile and reactive organosilicon compound, serving as a key intermediate in the synthesis of silicone polymers and functional silanes. Its value lies in its bifunctional chlorosilane structure, which allows for controlled chain extension and cross-linking in silicone chemistry. This product is essential for manufacturers in the silicone elastomer, resin, and specialty chemical industries, as well as for R&D laboratories developing advanced materials and surface modifiers.

Application

• Silicone Polymer Intermediate: A fundamental building block for the synthesis of polydimethylsiloxanes (PDMS) and other silicone copolymers.
• Cross-linking Agent: Used in the production of high-performance silicone resins, rubbers, and sealants where controlled curing is required.
• Surface Treatment Agent: Acts as a precursor for creating hydrophobic or release coatings on various substrates like paper, textiles, and metals.
• Pharmaceutical & Cosmetic Intermediates: Employed in the synthesis of siloxane-based excipients and active ingredients under controlled GMP conditions.
• Adhesive & Sealant Formulations: Provides reactive sites to enhance adhesion and modify the mechanical properties of silicone-based formulations.
• Laboratory Reagent: Used in organic and organometallic synthesis as a versatile silylating or protecting agent.

Basic Information

Product Name	1,3-Dichlorotetramethyldisiloxane
CAS No.	2401-73-2
Molecular Formula	C4H12Cl2OSi2
Molecular Weight	203.22 g/mol
Synonyms	1,3-Dichloro-1,1,3,3-tetramethyldisiloxane; Dichlorotetramethyldisiloxane; Tetramethyl-1,3-dichlorodisiloxane; Bis(chlorodimethylsilyl) ether; HMDS-Cl2 (Hexamethyldisiloxane dichloride analog); Disiloxane, 1,3-dichloro-1,1,3,3-tetramethyl-; Chlorotrimethylsiloxydimethylchlorosilane
EINECS	219-290-9

Quality Control

Our 1,3-Dichlorotetramethyldisiloxane is produced under stringent quality management systems. Each batch undergoes rigorous analytical testing, including GC, NMR, and titration methods, to ensure high purity and consistency. Certificates of Analysis (COA) detailing purity, identity, and impurity profiles are provided with every shipment to support your quality assurance and regulatory compliance 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 vigorously with water and strong bases. Keep the container tightly sealed under an inert atmosphere (e.g., nitrogen or argon) to prevent degradation from moisture and to maintain product integrity.

Specification

Item	Specification
Appearance	Colorless to pale yellow clear liquid
Identification (IR)	Conforms to reference spectrum
Assay (GC)	≥ 98.0 %
Density (at 20°C)	1.05 - 1.10 g/mL
Refractive Index (n20D)	1.405 - 1.415
Water Content (Karl Fischer)	≤ 0.1 %

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