Description

Octaphenylcyclotetrasiloxane is a high-purity organosilicon compound belonging to the phenyl-substituted cyclotetrasiloxane family. This chemical serves as a critical intermediate and building block in the synthesis of advanced silicone polymers and specialty materials. It is essential for manufacturers and R&D facilities in the silicone, electronics, and advanced materials sectors seeking to develop products with enhanced thermal stability, optical clarity, and specific mechanical properties.

Application

• Silicone Polymer Synthesis: A key monomer or intermediate for producing phenyl-containing silicone resins, rubbers, and oils with high thermal and oxidative stability.
• Advanced Materials: Used in the formulation of high-performance coatings, encapsulants, and adhesives for electronics requiring excellent dielectric properties and thermal resistance.
• Optical & LED Applications: Employed in the development of silicone lenses, seals, and encapsulants for LEDs and optical devices due to its clarity and stability under UV/heat.
• Research & Development: Serves as a precise chemical building block in academic and industrial R&D for creating novel organosilicon architectures and functional materials.
• Specialty Additives: Can be utilized as a precursor for modifying surface properties or as an additive to impart specific characteristics to polymer blends.

Basic Information

Product Name	Octaphenylcyclotetrasiloxane
CAS No.	546-56-5
Molecular Formula	C48H40O4Si4
Molecular Weight	793.18 g/mol
Synonyms	Cyclotetrasiloxane, octaphenyl-; Octaphenyltetracyclosiloxane; Tetrakis(phenyl)cyclotetrasiloxane; 2,2,4,4,6,6,8,8-Octaphenyl-1,3,5,7,2,4,6,8-tetraoxatetrasilocane; Phenylcyclotetrasiloxane; Dodecaphenylcyclohexasiloxane (common misnomer, related compound); Phenyl silsesquioxane precursor
EINECS	208-906-2

Quality Control

Our Octaphenylcyclotetrasiloxane is manufactured under strict quality management systems to ensure batch-to-batch consistency and high purity. Each lot undergoes comprehensive analytical testing, including chromatographic and spectroscopic methods, to verify identity and purity against stringent specifications. A Certificate of Analysis (COA) detailing all test results is provided with every shipment to support your quality assurance protocols.

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 oxidizing agents, strong acids, and strong bases. For long-term storage, consider an inert atmosphere to maintain optimal quality.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Melting Point	195 - 205 °C
Loss on Drying	≤ 0.5%
Residue on Ignition	≤ 0.1%

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