Description

2,2,4,4,6,6-Hexamethyl-8,8-Diphenylcyclotetrasiloxane CAS NO 1693-44-3 is a high-purity, organosilicon cyclic compound featuring a unique siloxane ring structure with phenyl and methyl substituents. This compound serves as a critical advanced intermediate and functional building block in the synthesis of specialty silicones and hybrid materials. It is essential for manufacturers in the electronics, high-performance coatings, and advanced polymer sectors seeking to enhance thermal stability, optical properties, and mechanical performance in their final products.

Application

• Silicone Resin & Polymer Synthesis: A key monomer for constructing phenyl-modified silicone resins with enhanced heat resistance and refractive index for LED encapsulation and optical lenses.
• Electronic Packaging Materials: Used in formulating high-purity silicone gels and encapsulants for semiconductors, offering excellent dielectric properties and thermal stability.
• High-Temperature Resistant Coatings: Serves as a precursor for coatings applied in aerospace and automotive industries where extreme thermal and oxidative stability is required.
• Hybrid Organic-Inorganic Materials (Ormosils): Acts as a cross-linking agent or co-monomer in sol-gel processes to create materials with tailored mechanical and surface properties.
• Specialty Silicone Fluids & Elastomers: Imparts phenyl groups into silicone chains to improve compatibility with organic polymers and resistance to radiation and solvents.
• Adhesives & Sealants: Incorporated into formulations for high-performance adhesives that must maintain integrity across a wide temperature range.
• Research & Development: A valuable reagent for academic and industrial R&D focused on novel organosilicon chemistry and material science.

Basic Information

Product Name	2,2,4,4,6,6-Hexamethyl-8,8-Diphenylcyclotetrasiloxane
CAS No.	1693-44-3
Molecular Formula	C18H28O4Si4
Molecular Weight	424.78 g/mol
Synonyms	Octaphenylcyclotetrasiloxane (common misnomer); 1,3,5,7-Tetramethyl-1,3,5,7-tetraphenylcyclotetrasiloxane; D4Ph; Cyclotetrasiloxane, 2,2,4,4,6,6-hexamethyl-8,8-diphenyl-; Tetramethyl tetraphenyl cyclotetrasiloxane; Phenyl D4; 1,1,3,3,5,5-Hexamethyl-7,7-diphenylcyclotetrasiloxane; Diphenylhexamethylcyclotetrasiloxane
EINECS	Contact for details

Quality Control

Our production of 2,2,4,4,6,6-Hexamethyl-8,8-Diphenylcyclotetrasiloxane adheres to a stringent quality management system. Every batch undergoes rigorous analytical testing, including GC, HPLC, and NMR, to ensure identity, purity, and consistency. Certificates of Analysis (COA) detailing all specification parameters are provided and can be tailored to meet specific customer or regulatory requirements.

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. For long-term storage, consider an inert atmosphere 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.