Description

Cyclotetrasiloxane, 2,2,4,4,6,8-Hexamethyl-6,8-Diphenyl-, cis- CAS NO 33204-75-0 is a specialized organosilicon compound belonging to the class of cyclic siloxanes, distinguished by its unique phenyl-substituted structure. This compound is valued for its role as a versatile intermediate and functional additive, offering enhanced thermal stability and compatibility in advanced material formulations. It is primarily sought by manufacturers in the personal care, specialty polymers, and high-performance silicone elastomer industries for developing products with tailored properties.

Application

• Silicone Resin & Elastomer Modifier: Acts as a reactive intermediate or plasticizer to enhance flexibility, thermal stability, and refractive index in high-performance silicone rubbers and resins.
• Personal Care & Cosmetic Ingredients: Used in the synthesis of silicone-based fluids and gums for premium skincare, haircare, and makeup products, providing a smooth, non-greasy feel and improved spreadability.
• Release Coatings & Adhesives: Serves as a key building block in formulating silicone release liners and pressure-sensitive adhesives with controlled release properties.
• Lubricants & Greases: Employed in the production of specialty silicone lubricants that offer stability across a wide temperature range and compatibility with various substrates.
• Electronic Encapsulants & Potting Compounds: Utilized in formulating silicones for protecting electronic components, where its structure can contribute to desirable dielectric and mechanical properties.
• Pharmaceutical & Medical Device Intermediates: Functions as a precursor in the synthesis of siloxane-based materials used in drug delivery systems and biocompatible medical device coatings.

Basic Information

Product Name	Cyclotetrasiloxane, 2,2,4,4,6,8-Hexamethyl-6,8-Diphenyl-, cis-
CAS No.	33204-75-0
Molecular Formula	C22H34O4Si4
Molecular Weight	474.87 g/mol
Synonyms	cis-2,2,4,4,6,8-Hexamethyl-6,8-diphenylcyclotetrasiloxane; 1,3,5,7-Tetramethyl-3,5-diphenylcyclotetrasiloxane (cis isomer); D4Ph2 (cis); Cyclotetrasiloxane, hexamethyl-diphenyl- (cis); Phenyl-modified cyclic siloxane; Octaphenylcyclotetrasiloxane derivative; Silicone cyclic tetramer, phenyl substituted; Contact for details on additional trade names.
EINECS	Contact for details

Quality Control

Our production of Cyclotetrasiloxane, 2,2,4,4,6,8-Hexamethyl-6,8-Diphenyl-, cis- adheres to stringent quality management protocols. Each batch undergoes rigorous analytical testing, including chromatography (GC/HPLC) and spectroscopy (IR, NMR), to ensure high purity, consistent isomeric composition, and compliance with agreed specifications. A comprehensive Certificate of Analysis (COA) detailing identity, assay, and impurity profiles is provided with every shipment to support your quality assurance processes.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). This product is hygroscopic (moisture-sensitive). Keep the container tightly sealed under an inert atmosphere (e.g., nitrogen) to prevent moisture absorption and potential hydrolysis. Isolate from strong oxidizing agents.

Specification

Item	Specification
Appearance	Colorless to pale yellow viscous liquid
Identification (IR)	Conforms to structure
Assay (GC)	≥ 95.0% (cis-isomer)
Water Content (KF)	≤ 0.1%
Refractive Index (n20D)	Contact for details
Density (20°C)	Contact for details

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