Description

1,3-Dimethyldisiloxane is a versatile organosilicon compound that serves as a fundamental building block in silicone chemistry. Its high volatility and reactive siloxane bonds make it a valuable precursor for synthesizing a wide range of silicone polymers, fluids, and functional materials. This chemical is essential for manufacturers and R&D laboratories in the silicone, electronics, and specialty chemical industries seeking to create tailored materials with specific properties.

Application

• Silicone Polymer Synthesis: A key monomer or chain transfer agent for producing polydimethylsiloxanes (PDMS) and other silicone copolymers.
• Surface Modification Agent: Used to impart hydrophobic or release properties to surfaces in coatings and textiles.
• Electronics Industry: Serves as a precursor for high-purity silicon-containing films in semiconductor manufacturing via chemical vapor deposition (CVD) processes.
• Adhesive & Sealant Formulation: Acts as a cross-linking agent or modifier to control the cure profile and final properties of silicone-based products.
• Laboratory Reagent: Employed in organic and organometallic synthesis as a silylating agent or protecting group.
• Lubricant & Fluid Additive: Used as a base or additive in specialty high-performance lubricants and heat transfer fluids.

Basic Information

Product Name	1,3-Dimethyldisiloxane
CAS No.	14396-21-5
Molecular Formula	C2H10OSi2
Molecular Weight	106.27 g/mol
Synonyms	Dimethyldisiloxane; 1,1,3,3-Tetramethyldisiloxane (common misnomer, correct for the tetrasubstituted isomer); Disiloxane, 1,3-dimethyl-; HMDSO (common abbreviation); Hexamethyldisiloxane precursor; Methyl disiloxane; Tetramethyldisiloxane (often used interchangeably in industry); Linear disiloxane
EINECS	Contact for details

Quality Control

Our 1,3-Dimethyldisiloxane is produced under stringent quality management systems. Each batch undergoes comprehensive analytical testing, including gas chromatography (GC) for purity and identity verification, to ensure it meets precise customer specifications. A Certificate of Analysis (COA) detailing all test results is provided with every shipment to guarantee traceability and batch-to-batch consistency.

Storage

Preserve in a tightly closed container, protected from light. Due to its highly volatile nature, store in a cool, well-ventilated area away from heat sources and open flames. Recommended storage temperature is 2-8°C to minimize evaporation and maintain stability. Keep container tightly sealed when not in use to prevent moisture ingress and contamination.

Specification

Item	Specification
Appearance	Colorless clear liquid
Identification (IR)	Conforms to structure
Assay (GC)	≥ 98.0%
Water Content (KF)	≤ 0.1%
Density (at 20°C)	0.76 - 0.78 g/mL
Refractive Index (n20D)	1.368 - 1.372

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