Description

Octaphenylsilsesquioxane is a well-defined, cage-structured organosilicon compound belonging to the polyhedral oligomeric silsesquioxane (POSS) family. This high-performance material is valued for its ability to dramatically enhance the thermal stability, mechanical strength, and flame retardancy of polymer composites. It is essential for R&D scientists and material engineers in the advanced plastics, high-temperature resins, and specialty coatings industries seeking to develop next-generation materials with superior properties.

Application

• High-Performance Polymer Additive: Acts as a nano-reinforcing agent to improve thermal stability and mechanical properties (modulus, strength) in engineering plastics like polycarbonate, epoxy, and silicone.
• Advanced Composite Materials: Used as a hybrid organic-inorganic component in aerospace and automotive composites to reduce weight while increasing heat resistance and dimensional stability.
• Flame Retardant Synergist: Incorporated into polymer formulations to enhance flame retardancy and reduce smoke emission, meeting stringent safety standards in electronics and construction materials.
• Precursor for Functional Materials: Serves as a building block or core structure for synthesizing more complex dendrimers, star-shaped polymers, and porous materials for catalysis or gas separation.
• Dielectric Materials: Utilized in the development of low-k dielectric films for microelectronics due to its inherent molecular porosity and thermal stability.
• Specialty Coatings & Adhesives: Improves heat resistance, scratch resistance, and weatherability in high-temperature protective coatings and adhesives.

Basic Information

Product Name	Octaphenylsilsesquioxane
CAS No.	5256-79-1
Molecular Formula	C48H40O12Si8
Molecular Weight	1033.56 g/mol
Synonyms	Octaphenyl-POSS; Octaphenyl T8 Silsesquioxane; Phenylsilsesquioxane resin; POSS Cage Mixture, Octaphenyl substituted; Octaphenylcyclotetrasiloxane; 2,4,6,8,10,12,14,16-Octaphenyl-2,4,6,8,10,12,14,16-octasilapentacyclo[9.5.1.13,9.15,15.17,13]octasiloxane; Octaphenyl cubic silsesquioxane
EINECS	226-066-3

Quality Control

Our Octaphenylsilsesquioxane is manufactured under a strict quality management system. Each batch undergoes rigorous analytical testing, including HPLC, NMR, and FT-IR, to ensure identity, purity, and consistency. A comprehensive Certificate of Analysis (COA) detailing all specifications 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, and well-ventilated area at room temperature (15-25°C). Keep the container tightly sealed to minimize exposure to moisture.

Specification

Item	Specification
Appearance	White to off-white powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0% (T8 Cage)
Melting Point	Contact for details
Loss on Drying	≤ 1.0%
Residue on Ignition	Contact for details

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