Description

Hexamethylcyclotrisiloxane is a key organosilicon monomer and a fundamental building block in silicone chemistry. Its primary value lies in its role as a precursor for the synthesis of polydimethylsiloxanes (PDMS) and other functional silicone polymers and fluids. This compound is essential for manufacturers in the silicone industry, serving as a critical raw material for producing high-performance materials used in personal care, pharmaceuticals, and industrial applications.

Application

• Silicone Polymer Synthesis: Primary monomer for the ring-opening polymerization to produce linear polydimethylsiloxane (PDMS) fluids and high molecular weight silicone polymers.
• Personal Care & Cosmetics: Used in the manufacture of silicone-based ingredients that provide smooth texture, emolliency, and shine in lotions, creams, hair conditioners, and antiperspirants.
• Pharmaceutical Intermediates: Serves as a key intermediate in the synthesis of silicone-based excipients and controlled-release drug delivery systems.
• Industrial Lubricants & Greases: A precursor for silicone oils and greases known for their thermal stability, wide operating temperature range, and water repellency.
• Release Agents & Mold Making: Used to produce silicone release coatings for pressure-sensitive adhesives and as a base for RTV (Room Temperature Vulcanizing) silicone rubbers.
• Surface Treatments: Intermediate for creating water-repellent and anti-adhesive surface coatings on textiles, paper, and construction materials.
• Electronics & Electrical: Used in the synthesis of silicone encapsulants, potting compounds, and dielectric fluids for electronic protection and insulation.
• Specialty Silicone Fluids: Building block for modified silicone copolymers with specific properties like enhanced solubility, reactivity, or compatibility.

Basic Information

Product Name	Hexamethylcyclotrisiloxane
CAS No.	541-05-9
Molecular Formula	C6H18O3Si3
Molecular Weight	222.46 g/mol
Synonyms	D3; Cyclotrisiloxane, hexamethyl-; 2,2,4,4,6,6-Hexamethylcyclotrisiloxane; Hexamethyl-1,3,5-trisiloxane; 1,3,5-Trimethyl-1,3,5-trimethylcyclotrisiloxane; Cyclic dimethylsiloxane trimer; D3 Siloxane
EINECS	208-764-9

Quality Control

Our Hexamethylcyclotrisiloxane is produced under stringent quality management systems to ensure batch-to-batch consistency and high purity. The product undergoes rigorous analytical testing, including gas chromatography (GC), to confirm identity, assay, and impurity profiles. Certificates of Analysis (COA) detailing all specifications are provided with each shipment to support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area away from heat sources and incompatible materials. Recommended storage temperature is between 15°C and 25°C. Keep container tightly sealed when not in use to prevent moisture absorption and maintain product integrity.

Specification

Item	Specification
Appearance	Colorless liquid
Identification (IR)	Conforms
Assay (GC)	≥ 99.0%
Water Content (KF)	≤ 0.05%
Refractive Index (n20D)	1.388 - 1.392
Density (20°C)	0.95 - 0.97 g/cm³

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