Description

Siloxanes And Silicones, Di-Me, Di-Ph, Polymers With Me Ph Silsesquioxanes, Hydroxy-Terminated is a specialized organosilicon polymer featuring a hybrid structure of dimethyl, diphenyl siloxane units, and methyl phenyl silsesquioxanes, terminated with reactive hydroxyl groups. This unique architecture provides an exceptional balance of thermal stability, optical clarity, and mechanical reinforcement, making it a critical performance additive. It is primarily sought by formulators in the advanced materials sector for developing high-performance coatings, encapsulants, and composite matrices. The reactive hydroxy functionality allows for further chemical modification and crosslinking, enabling tailored material properties.

Application

• High-Temperature Resistant Coatings: Serves as a key resin modifier or additive in protective and decorative coatings for aerospace, automotive, and industrial equipment, enhancing thermal stability and weatherability.
• LED Encapsulation & Optoelectronics: Used in formulating clear, stable potting gels and encapsulants for LEDs and optical devices, offering excellent light transmission and long-term reliability.
• Advanced Composite Matrices: Acts as a polymeric component in silicone-based composites, improving the interfacial adhesion between fibers (e.g., glass, carbon) and the resin for superior mechanical performance.
• Specialty Adhesives & Sealants: Incorporated into high-performance silicone adhesives and sealants requiring enhanced strength, flexibility, and resistance to extreme environments.
• Release Coatings & Molding: Utilized in formulations for premium release coatings and mold-making applications where high heat resistance and non-stick properties are critical.
• Electronic Underfills & Potting: Provides stress relief, moisture protection, and thermal management in sensitive electronic assemblies and components.

Basic Information

Item	Detail
Product Name	Siloxanes And Silicones, Di-Me, Di-Ph, Polymers With Me Ph Silsesquioxanes, Hydroxy-Terminated
CAS No.	110775-80-9
Molecular Formula	Contact for details
Molecular Weight	Contact for details (Oligomeric/Mixture)
Synonyms	Hydroxy-Terminated Methyl Phenyl Siloxane-Silsesquioxane Copolymer; Diphenyl Dimethyl Siloxane Methyl Phenyl Silsesquioxane Hydroxy-Terminated Polymer; Phenyl-Modified Silicone Resin with OH Endgroups; Methyl Phenyl Silsesquioxane-Dimethyl Diphenyl Siloxane Copolymer, Hydroxy-Terminated; OH-Terminated Phenyl Silicone Oligomer; Reactive Phenyl Silicone Fluid; Silicone Resin Intermediate, Hydroxy-Functional
EINECS	Contact for details

Quality Control

Our production of hydroxy-terminated phenyl-modified siloxane polymers adheres to a stringent quality management system. Each batch is characterized using advanced analytical techniques including Gel Permeation Chromatography (GPC) for molecular weight distribution, Fourier-Transform Infrared Spectroscopy (FT-IR) for structural confirmation, and titration for hydroxyl value determination. Certificates of Analysis (COA) documenting key parameters such as viscosity, non-volatile content, and hydroxyl functionality are provided to ensure batch-to-batch consistency and compliance with your formulation requirements.

Storage

Preserve in a tightly closed container, protected from light. This material is hygroscopic (moisture-sensitive). Store in a cool, dry, and well-ventilated area at room temperature (15-25°C/59-77°F). Keep the container tightly sealed when not in use to prevent moisture absorption and contamination. Store away from incompatible materials such as strong acids, bases, and oxidizing agents.

Specification

Item	Specification
Appearance	Colorless to pale yellow viscous liquid
Identification (IR)	Conforms to structure
Non-Volatile Matter	> 98.0 %
Viscosity (25°C)	Specification available upon request
Hydroxyl Value	Specification available upon request
Refractive Index (n20D)	Specification available upon request

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