Description

Poly(Propylsilsesquioxane), Ethoxy Terminated is a specialized organosilicon polymer featuring a silsesquioxane cage structure terminated with ethoxy groups. This unique architecture provides a valuable combination of thermal stability, low dielectric constant, and enhanced compatibility with organic matrices, making it a critical performance additive. It is primarily used by formulators and material scientists in advanced coatings, high-performance composites, and electronic encapsulants. The product is supplied under strict quality control to ensure batch-to-batch consistency for demanding industrial applications.

Application

• As a reinforcing and compatibilizing agent in high-temperature silicone resins and rubbers.
• As a surface modifier and coupling agent to improve the dispersion and adhesion of inorganic fillers in polymer composites.
• As a precursor for hybrid organic-inorganic materials (ORMOSILs) used in protective and optical coatings.
• In the formulation of low-k dielectric materials for microelectronics and semiconductor packaging.
• As a crosslinking agent or reactive diluent in specialty silicone-based sealants and adhesives.
• For the synthesis of functionalized silsesquioxanes for further chemical modification in R&D.

Basic Information

Product Name	Poly(Propylsilsesquioxane), Ethoxy Terminated
CAS No.	314270-00-3
Molecular Formula	Contact for details
Molecular Weight	Contact for details
Synonyms	Ethoxy-Terminated Poly(Propylsilsesquioxane); Propyl Silsesquioxane, Ethoxy-Terminated; Ethoxy-Functionalized Propyl-POSS; Polyhedral Oligomeric Silsesquioxane with Propyl and Ethoxy Groups; POSS-Ethoxy Propyl; Incompletely Condensed Propylsilsesquioxane Ethoxysilane; T8 Propyl Silsesquioxane, Ethoxy Capped
EINECS	Contact for details

Quality Control

Our Poly(Propylsilsesquioxane), Ethoxy Terminated is manufactured under a strict quality management system. Each batch undergoes rigorous analytical testing to ensure it meets defined specifications for purity, functionality, and consistency. A comprehensive Certificate of Analysis (COA) detailing key parameters 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). This material is hygroscopic (moisture-sensitive); ensure containers are sealed immediately after use to prevent degradation from atmospheric moisture.

Specification

Item	Specification
Appearance	Colorless to pale yellow viscous liquid
Identification (IR)	Conforms to structure
Assay (Si Content)	Contact for details
Ethoxy Content	Contact for details
Viscosity (25°C)	Contact for details
Specific Gravity (25°C)	Contact for details
Moisture (KF)	< 0.5%

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