Description

2,4,6,8-Tetramethyl-2,4,6,8-Tetraphenylcyclotetrasiloxane is a high-purity organosilicon cyclic compound that serves as a critical intermediate and functional additive in advanced material synthesis. Its unique structure, featuring both methyl and phenyl substituents on a cyclotetrasiloxane ring, provides exceptional thermal stability and compatibility with organic polymers. This product is essential for manufacturers in the silicone, electronics, and specialty chemical industries seeking to enhance material properties or synthesize novel siloxane-based architectures.

Application

• Silicone Resin & Elastomer Modification: Acts as a cross-linking agent or chain extender to improve thermal stability, mechanical strength, and refractive index of high-performance silicones.
• Specialty Polymer Synthesis: Serves as a key monomer or intermediate in the production of phenyl-containing polysiloxanes, ladder polymers, and other advanced polymeric materials.
• Electronic Encapsulants & Adhesives: Used in formulations for LED packaging, semiconductor potting, and conductive adhesives where high purity and thermal/optical properties are critical.
• Optical & Photonic Materials: Incorporated into coatings, films, and waveguides due to its ability to modify the refractive index and clarity of optical silicones.
• Release Coatings & Lubricants: Functions as a precursor for phenyl-modified silicone fluids used in high-temperature mold release agents and specialty lubricants.
• Research & Development: A valuable building block in academic and industrial R&D for exploring new organosilicon chemistry, dendrimers, and hybrid materials.

Basic Information

Product Name	2,4,6,8-Tetramethyl-2,4,6,8-Tetraphenylcyclotetrasiloxane
CAS No.	77-63-4
Molecular Formula	C28H32O4Si4
Molecular Weight	537.0 g/mol
Synonyms	2,4,6,8-Tetraphenyl-2,4,6,8-tetramethylcyclotetrasiloxane; Tetramethyltetraphenylcyclotetrasiloxane; Cyclotetrasiloxane, 2,4,6,8-tetramethyl-2,4,6,8-tetraphenyl-; 1,3,5,7-Tetramethyl-1,3,5,7-tetraphenylcyclotetrasiloxane; Phenylmethylcyclotetrasiloxane; D4Ph,Me; Octaphenyltetramethylcyclotetrasiloxane (common name)
EINECS	201-047-7

Quality Control

Our production of 2,4,6,8-Tetramethyl-2,4,6,8-Tetraphenylcyclotetrasiloxane adheres to stringent quality management protocols to ensure batch-to-batch consistency and high purity. Each lot undergoes comprehensive analytical testing, including HPLC, GC, NMR, and FT-IR for identity confirmation and impurity profiling. We provide a detailed Certificate of Analysis (COA) with every shipment, documenting key specifications such as assay purity, melting point, and residual solvent content. Our quality system is designed to meet the exacting requirements of industrial and research applications.

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 oxidizing agents, strong acids, and strong bases. The product is moisture-sensitive; ensure containers are kept tightly sealed when not in use to prevent absorption of atmospheric moisture.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to reference spectrum
Assay (HPLC)	≥ 98.0%
Melting Point	185 - 195 °C
Loss on Drying	≤ 0.5%
Heavy Metals (as Pb)	≤ 10 ppm
Residual Solvents (GC)	Meets ICH Q3C guidelines

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