Description

Bis(Heptamethylcyclotetrasiloxy)Hexamethyltrisiloxane is a high-purity, branched organosilicon compound belonging to the class of silicone fluids and resins. This specialty siloxane is valued for its unique combination of thermal stability, low surface tension, and compatibility with organic polymers, making it a critical performance additive. It is primarily used by formulators and manufacturers in the personal care, coatings, and advanced materials industries seeking to enhance product properties such as spreadability, gloss, and hydrophobicity.

Application

• Personal Care & Cosmetics: Acts as a premium emollient and spreading agent in antiperspirants, deodorants, sunscreens, and color cosmetics for a smooth, non-greasy feel.
• Release Agents & Mold Lubricants: Used in industrial molding processes (e.g., plastics, rubber, polyurethane) to provide excellent release properties and prevent sticking.
• Coatings & Inks: Functions as a flow and leveling additive to improve surface smoothness, gloss, and mar resistance in high-performance coatings and printing inks.
• Polymers & Elastomers: Serves as a processing aid and internal lubricant to reduce viscosity, improve filler dispersion, and enhance surface characteristics in silicone and organic rubber compounds.
• Water Repellents: Imparts durable water repellency (DWR) to textiles, leather, and construction materials due to its hydrophobic nature.
• Dielectric Fluids: Suitable for use in specialized electrical or thermal fluid applications requiring stable, inert silicone media.

Basic Information

Product Name	Bis(Heptamethylcyclotetrasiloxy)Hexamethyltrisiloxane
CAS No.	71449-67-7
Molecular Formula	C26H78O11Si11
Molecular Weight	~1075.0 g/mol
Synonyms	Hexamethyltrisiloxane, bis(heptamethylcyclotetrasiloxy)-; Heptamethylcyclotetrasiloxane, homopolymer, 3-[(heptamethylcyclotetrasiloxanyl)oxy]-1,1,1,3,5,5,5-heptamethyltrisiloxane; Silicone Fluid DMC-T11; Branched Methyl Silicone Fluid; Cyclomethicone D11; Poly[oxy(methylsilylene)] α-[tris(trimethylsiloxy)silyl]-ω-(heptamethylcyclotetrasiloxy)-; 1,1,1,3,5,5,5-Heptamethyl-3-[2,4,6,8-tetramethyl-2,4,6,8-tetrakis(trimethylsiloxy)cyclotetrasiloxan-1-yl]oxy]trisiloxane
EINECS	Contact for details

Quality Control

Our Bis(Heptamethylcyclotetrasiloxy)Hexamethyltrisiloxane is manufactured under a strict quality management system. Each batch undergoes rigorous analytical testing, including assay by GC or GPC, viscosity measurement, and refractive index determination, to ensure consistency and compliance with agreed specifications. Certificates of Analysis (COA) documenting purity, identity, and key physical properties are provided with every shipment and are available upon request.

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, bases, and oxidizing agents. Under these conditions, the product is stable for at least 24 months from the date of manufacture.

Specification

Item	Specification
Appearance	Colorless to pale yellow clear liquid
Identification (IR)	Conforms to reference spectrum
Assay (GC/GPC)	≥ 95.0%
Viscosity @ 25°C	Contact for details
Refractive Index @ 20°C	Contact for details
Specific Gravity @ 25°C	Contact for details
Water Content (KF)	≤ 0.1%

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