Description

Hexadecamethylcyclooctasiloxane is a high-purity cyclic siloxane, a key organosilicon intermediate valued for its volatility and reactivity. This compound is essential for the synthesis of silicone polymers and for modifying material surfaces. It is primarily required by manufacturers in the personal care, electronics, and specialty chemical industries for producing high-performance materials.

Application

• Primary intermediate for the synthesis of polydimethylsiloxanes (PDMS) and other silicone polymers.
• Volatile carrier and spreading agent in personal care products such as antiperspirants, cosmetics, and hair conditioners.
• Surface treatment agent to impart water repellency and release properties to textiles, paper, and construction materials.
• Precursor for the production of silicone-based surfactants and defoamers.
• Used in electronics manufacturing as a solvent or processing aid for dielectric materials and coatings.
• Component in lubricants and mold release agents for industrial and automotive applications.
• Raw material for creating custom siloxane structures and hybrid materials in advanced R&D.

Basic Information

Product Name	Hexadecamethylcyclooctasiloxane
CAS No.	556-68-3
Molecular Formula	C16H48O8Si8
Molecular Weight	593.19 g/mol
Synonyms	D8; Cyclooctasiloxane, hexadecamethyl-; Octamethylcyclotetrasiloxane, dimer; Dodecamethylcyclohexasiloxane, tetramer; Cyclic Volatile Methyl Siloxane (cVMS) D8; Octasiloxane, hexadecamethyl-; 2,2,4,4,6,6,8,8,10,10,12,12,14,14,16,16-Hexadecamethyl-1,3,5,7,9,11,13,15-octaoxa-2,4,6,8,10,12,14,16-octasilacyclohexadecane
EINECS	209-136-7

Quality Control

Our Hexadecamethylcyclooctasiloxane is manufactured under a strict quality management system. Each batch undergoes comprehensive analytical testing, including gas chromatography (GC), to ensure it meets precise purity and compositional specifications. A Certificate of Analysis (COA) detailing all test results is provided with every shipment to guarantee traceability and compliance with your technical requirements.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). Keep away from strong acids, strong bases, and oxidizing agents. Due to its volatile nature, ensure containers are properly sealed when not in use.

Specification

Item	Specification
Appearance	Colorless clear liquid
Identification (IR)	Conforms
Assay (GC)	≥ 98.0%
Refractive Index (n20D)	1.395 - 1.398
Density (20°C)	0.95 - 0.97 g/cm³
Water Content (KF)	≤ 0.05%

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