Description

1,3,3,5,5,7-Hexamethyl-1,1,7,7-tetraphenyltetrasiloxane is a high-purity organosilicon compound, specifically a phenyl-modified siloxane, valued for its unique thermal stability and hydrophobic properties. This compound serves as a critical intermediate and functional additive in advanced material synthesis, offering enhanced performance where standard methyl siloxanes fall short. It is essential for manufacturers in the silicone polymers, specialty coatings, and electronics industries seeking to improve product durability and surface characteristics.

Application

• Silicone Resin & Polymer Modification: Acts as a chain extender or cross-linking agent to introduce phenyl groups, enhancing the heat resistance, refractive index, and radiation stability of resulting silicone polymers.
• High-Temperature Lubricants & Greases: Used as a base fluid or additive in formulations requiring exceptional thermal-oxidative stability and low volatility under extreme conditions.
• Specialty Release Coatings & Molding Aids: Imparts excellent release properties and surface smoothness in high-temperature molding processes for plastics, composites, and rubber.
• Dielectric & Encapsulation Materials: Incorporated into silicone gels, potting compounds, and conformal coatings for electronics to improve electrical insulation and long-term reliability.
• Hydrophobic Surface Treatments: Functions as a precursor or additive in coatings to create water-repellent, anti-stick surfaces on glass, ceramics, or metals.
• Adhesive & Sealant Formulations: Enhances the flexibility, weatherability, and adhesion of high-performance silicone adhesives and sealants.
• Personal Care & Cosmetic Ingredients: Used in premium hair care and skincare products as a conditioning agent that provides gloss and thermal protection without greasiness.
• Research & Chemical Synthesis: Serves as a valuable building block in organic and organometallic chemistry for developing novel siloxane-based materials.

Basic Information

Item	Details
Product Name	1,3,3,5,5,7-Hexamethyl-1,1,7,7-Tetraphenyltetrasiloxane
CAS No.	6904-66-1
Molecular Formula	C34H46O3Si4
Molecular Weight	603.06 g/mol
Synonyms	Hexamethyltetraphenyltetrasiloxane; Tetrasiloxane, 1,1,7,7-tetraphenyl-1,3,3,5,5,7-hexamethyl-; 1,1,7,7-Tetraphenyl-1,3,3,5,5,7-hexamethyltetrasiloxane; Phenyl Modified Siloxane; PMPS (Phenyl Methyl Polysiloxane); Dow Corning® 550 Fluid (related class); Phenyl T Resin Intermediate; Tetraphenyl Hexamethyl Tetrasiloxane
EINECS	Contact for details

Quality Control

Every batch of our 1,3,3,5,5,7-Hexamethyl-1,1,7,7-tetraphenyltetrasiloxane undergoes rigorous analytical testing to ensure it meets stringent purity and consistency standards. Our quality assurance protocol includes advanced chromatographic and spectroscopic methods to verify chemical identity and quantify key impurities. A comprehensive Certificate of Analysis (COA) detailing purity, assay, and specific test results is provided with each shipment to support your quality management systems.

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 bases and incompatible materials such as strong oxidizing agents. The container must be kept tightly sealed to prevent moisture absorption and contamination.

Specification

Item	Specification
Appearance	Colorless to pale yellow viscous liquid
Identification (IR)	Conforms to structure
Assay (GC/HPLC)	≥ 97.0%
Refractive Index (n20D)	1.520 - 1.530
Density (25°C)	1.00 - 1.10 g/cm³
Viscosity (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.