Description

1,3,5,7-Tetramethyl-1,1,3,5,7,7-Hexaphenyltetrasiloxane is a high-purity, organosilicon compound characterized by its unique cyclic tetrasiloxane structure with phenyl and methyl substituents. This molecular architecture provides exceptional thermal stability and compatibility with a wide range of organic polymers and resins. It is a critical intermediate and functional additive for advanced material science, serving industries that require precise control over surface properties, rheology, and thermal performance.

Application

• Silicone Resin & Elastomer Modification: Acts as a chain extender, cross-linking agent, or property modifier to enhance thermal stability, mechanical strength, and refractive index.
• High-Performance Release Coatings: Used in the formulation of premium non-stick and release coatings for industrial molding and food processing applications.
• Specialty Adhesives & Sealants: Imparts improved flexibility, weatherability, and adhesion to various substrates in demanding environments.
• Optical & Electronic Materials: Serves as a precursor or additive in the synthesis of siloxane-based polymers for LED encapsulants, optical lenses, and dielectric layers.
• Personal Care & Cosmetic Ingredients: Functions as a volatile carrier, emollient, or texturizing agent in high-end cosmetic formulations.
• Lubricant & Grease Additives: Enhances the performance of synthetic lubricants under extreme pressure and temperature conditions.
• Pharmaceutical Intermediates: Utilized in the synthesis of complex siloxane-based active pharmaceutical ingredients (APIs) or excipients.
• Research & Development: A valuable building block for academic and industrial R&D in organosilicon chemistry and novel material design.

Basic Information

Product Name	1,3,5,7-Tetramethyl-1,1,3,5,7,7-Hexaphenyltetrasiloxane
CAS No.	38421-40-8
Molecular Formula	C40H44O3Si4
Molecular Weight	685.13 g/mol
Synonyms	Hexaphenyltetramethylcyclotetrasiloxane; Tetramethylhexaphenylcyclotetrasiloxane; 1,1,3,3,5,5,7,7-Octaphenyl-2,4,6,8-tetramethylcyclotetrasiloxane (alternate numbering); Cyclic Tetrasiloxane, Tetramethylhexaphenyl-; D4-Phenyl Methyl Derivative; PMHS Cyclic Tetramer (Phenyl-Methyl); Octaphenyl Tetramethyl Cyclotetrasiloxane
EINECS	Contact for details

Quality Control

Our production of 1,3,5,7-Tetramethyl-1,1,3,5,7,7-Hexaphenyltetrasiloxane adheres to a stringent quality management system. Every batch is analyzed using advanced techniques including GC, HPLC, and NMR to ensure identity, purity, and consistency. A comprehensive Certificate of Analysis (COA) detailing assay, impurity profile, and physical properties is provided with each shipment. We support compliance with relevant global regulatory frameworks, including REACH.

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). Keep away from strong acids and incompatible organic solvents. For long-term storage, consider an inert atmosphere (nitrogen or argon) to maintain product integrity.

Specification

Item	Specification
Appearance	White to off-white crystalline powder or solid
Identification (IR)	Conforms to structure
Assay (GC/HPLC)	≥ 98.0%
Melting Point	Contact for details
Loss on Drying	≤ 0.5%
Residue on Ignition	≤ 0.1%
Heavy Metals (as Pb)	≤ 10 ppm

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