Description

Polyphenylsilsesquioxane (CAS No. 62725-49-9) is a high-performance organosilicon polymer characterized by a hybrid inorganic-organic structure. This compound matters for its exceptional thermal stability, low dielectric constant, and excellent mechanical properties, making it a critical material for advanced engineering applications. Industries requiring high-temperature resins, protective coatings, and specialized composites are the primary users of this versatile chemical.

Application

• As a high-temperature resin and binder in advanced ceramic and composite materials.
• As a key component in the formulation of heat-resistant and protective coatings.
• As a precursor for silicon carbide (SiC) fibers and ceramics via pyrolysis.
• As a dielectric material in microelectronics and semiconductor packaging.
• As a modifier to enhance the thermal and oxidative stability of polymers.
• In the development of ablative materials for aerospace thermal protection systems.
• As a reinforcing agent in specialty elastomers and sealants.

Basic Information

Product Name	Polyphenylsilsesquioxane
CAS No.	62725-49-9
Molecular Formula	(C6H5SiO1.5)n
Molecular Weight	Variable (Polymer)
Synonyms	Polyphenylsilsequioxane; Phenylsilsesquioxane resin; Polyphenyl T-structure; Phenyl T-resin; POSS (Polyhedral Oligomeric Silsesquioxane) derivative; Polyphenylsiloxane; 1,3,5,7-Tetraphenyl-1,3,5,7-tetrahydroxycyclotetrasiloxane oligomer; Phenyl-based silsesquioxane polymer
EINECS	Contact for details

Quality Control

Our Polyphenylsilsesquioxane is manufactured under a strict quality management system. Each batch undergoes rigorous analytical testing to ensure consistency and performance. Key parameters monitored include molecular weight distribution, phenyl content, and residual silanol groups. A comprehensive Certificate of Analysis (COA) detailing purity, physical properties, and test results is provided with every shipment.

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). The product is moisture-sensitive; keep the container tightly sealed when not in use to prevent absorption of atmospheric moisture.

Specification

Item	Specification
Appearance	White to off-white powder or solid
Identification (IR)	Conforms to structure
Phenyl Content	> 95% (by wt.)
Weight Average Molecular Weight (Mw)	1,000 - 10,000 g/mol (Typical)
Loss on Drying	< 2.0 %
Residual Solvent	< 0.5 %

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