Description

Hexakis(Trimethylsiloxy)Disiloxane is a highly branched, low molecular weight organosilicon compound, specifically a siloxane functionalized with multiple trimethylsiloxy groups. This unique structure provides exceptional volatility and surface activity, making it a valuable intermediate and functional additive in advanced material synthesis. It is primarily sought by manufacturers in the silicone, electronics, and specialty chemical industries for its role in modifying surface properties, enhancing flow characteristics, and serving as a building block for more complex siloxane architectures.

Application

• Silicone Resin & Fluid Modification: Acts as a chain terminator or branching agent to control molecular weight and viscosity in the production of specialty silicone oils, resins, and elastomers.
• Surface Treatment & Release Agents: Used to impart hydrophobic and release properties to surfaces in mold release formulations, paper coatings, and textile treatments.
• Electronics Industry: Serves as a precursor or additive in spin-on dielectric (SOD) materials, semiconductor encapsulants, and other electronic-grade silicones requiring high purity.
• Personal Care & Cosmetics: Functions as a volatile carrier, emollient, or conditioning agent in antiperspirants, hair care, and skin care products due to its smooth texture and evaporation profile.
• Adhesive & Sealant Formulations: Employed as a plasticizer or flow aid to improve workability and final properties of silicone-based adhesives and sealants.
• Chemical Synthesis Intermediate: A key starting material or protecting group reagent in the synthesis of more complex organosilicon compounds and dendrimers.

Basic Information

Product Name	Hexakis(Trimethylsiloxy)Disiloxane
CAS No.	18602-90-9
Molecular Formula	C18H54O7Si8
Molecular Weight	607.3 g/mol
Synonyms	1,1,1,3,5,5,5-Heptamethyl-3-[(trimethylsilyl)oxy]trisiloxane; Dodecamethylpentasiloxane; Trisiloxane, 1,1,1,3,5,5,5-heptamethyl-3-[(trimethylsilyl)oxy]-; Hexakis(trimethylsiloxy)disiloxane; HMTS; TS720 (common trade name); Pentasiloxane, dodecamethyl-; Disiloxane, hexakis(trimethylsiloxy)-
EINECS	242-440-1

Quality Control

Our Hexakis(Trimethylsiloxy)Disiloxane is manufactured under strict quality management systems. Each batch undergoes rigorous analytical testing, including Gas Chromatography (GC) for purity and identity confirmation, to ensure it meets precise specifications for industrial and electronic applications. A comprehensive Certificate of Analysis (COA) detailing purity, assay, and impurity profiles is provided with every shipment to guarantee consistency and support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). Due to its highly volatile nature, ensure containers are kept tightly sealed when not in use to prevent evaporation and potential concentration changes. Keep away from strong bases and fluorides.

Specification

Item	Specification
Appearance	Colorless to pale yellow clear liquid
Identification (IR)	Conforms to structure
Assay (GC)	≥ 98.0%
Refractive Index (n20D)	1.3880 - 1.3920
Density (20°C)	0.92 - 0.96 g/mL
Volatiles	≤ 1.0%

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