Intermediates

Octaphenylcyclotetrasiloxane

  • CAS No.546-56-5
  • GradeIndustrial / Pharmaceutical
  • Availability● In Stock

High-purity Octaphenylcyclotetrasiloxane (CAS 546-56-5) designed for phenyl silicone rubber production. Offers exceptional thermal stability and consistent quality for industrial synthesis.

Request Bulk Pricing

Product Technical Details

Product Overview

Octaphenylcyclotetrasiloxane is a specialized organosilicon compound characterized by its unique cyclic structure containing eight phenyl groups attached to a tetrasiloxane ring. This chemical serves as a critical intermediate in the synthesis of high-performance phenyl silicone rubbers and resins. The presence of phenyl substituents significantly enhances the thermal stability and radiation resistance of the resulting polymers compared to standard methyl silicone materials. Our manufacturing process ensures consistent molecular weight distribution and high purity, making it an ideal choice for demanding industrial applications where material reliability is paramount.

Technical Specifications

We adhere to strict quality control protocols to guarantee that every batch meets rigorous industry standards. The following table outlines the key physical and chemical properties of our premium grade Octaphenylcyclotetrasiloxane.

ParameterSpecification
CAS Number546-56-5
Molecular FormulaC48H40O4Si4
Molecular Weight793.17 g/mol
AppearanceWhite solid
Purity (GC)≥98.0%
Melting Point196-198°C
Density1.185 g/cm³
Refractive Index1.66

Key Advantages

  • Exceptional thermal stability due to high phenyl content.
  • Superior resistance to high-energy radiation and oxidation.
  • Consistent batch-to-batch quality for reliable polymerization.
  • Optimized for use in high-temperature silicone rubber formulations.
  • Strictly controlled impurity profile to ensure downstream performance.

Industrial Applications

This compound is primarily utilized as a monomer or co-monomer in the production of phenyl silicone rubber. The incorporation of phenyl groups disrupts the crystallization of the polymer chain, maintaining flexibility at extremely low temperatures while simultaneously improving stability at high temperatures. It is extensively used in aerospace seals, electrical insulation materials, and specialized coatings that require durability under harsh environmental conditions. Additionally, it serves as a valuable building block for synthesizing modified silicone resins with enhanced compatibility with organic polymers.

Storage and Handling

To maintain product integrity, Octaphenylcyclotetrasiloxane should be stored in a cool, ventilated warehouse away from direct sunlight and heat sources. The material is packaged in 25 kg drums, though custom packaging solutions are available to meet specific logistical requirements. Proper handling procedures should be followed to prevent contamination. We provide a comprehensive Certificate of Analysis (COA) with every shipment to verify compliance with stated specifications. Our global supply chain ensures timely delivery to manufacturers worldwide, supporting continuous production schedules.