Description

Siloxanes And Silicones, Di-Me, Methoxy Ph, Polymers With Ph Silsesquioxanes, Methoxy-Terminated is a specialized organosilicon polymer featuring a hybrid structure of polydimethylsiloxane (PDMS) and phenyl silsesquioxane units, terminated with methoxy groups. This unique architecture provides exceptional thermal stability, low dielectric constant, and enhanced compatibility with organic and inorganic matrices, making it a critical performance additive. It is primarily sought after by formulators and manufacturers in high-tech industries requiring materials that withstand extreme conditions. The compound is identified by CAS No. 68957-04-0.

Application

• High-Temperature Resistant Coatings: Used as a key modifier in protective and release coatings for automotive, aerospace, and industrial applications.
• Electronic Encapsulants & Underfills: Enhances the thermal stability, moisture resistance, and mechanical properties of materials protecting semiconductors and circuit boards.
• Advanced Composite Materials: Acts as a coupling agent or resin modifier in fiber-reinforced plastics (FRP) and ceramic matrix composites to improve interfacial adhesion and heat resistance.
• Specialty Adhesives & Sealants: Imparts flexibility, weatherability, and thermal endurance to formulations used in construction and electronics assembly.
• LED Packaging Materials: Serves as a component in silicones for LED encapsulation, offering excellent light transmission and long-term reliability at high operating temperatures.
• Release Agents: Formulated into high-performance mold release agents for plastics, rubber, and composite manufacturing processes.

Basic Information

Product Name	Siloxanes And Silicones, Di-Me, Methoxy Ph, Polymers With Ph Silsesquioxanes, Methoxy-Terminated
CAS No.	68957-04-0
Molecular Formula	Complex Polymer (Contact for details)
Molecular Weight	Varies by grade (Contact for details)
Synonyms	Methoxy-Terminated Phenyl Silsesquioxane-Dimethylsiloxane Copolymer; Phenyl T-Structured Silicone Fluid; Methoxy-Functional Phenyl Silicone Resin; Polydimethylsiloxane-co-Phenylsilsesquioxane, Methoxy End-Capped; Phenyl Modified Silicone Oil; Siloxane-Silsesquioxane Hybrid Polymer; Aromatic Silicone Polymer
EINECS	Contact for details

Quality Control

Our production of this advanced silicone polymer adheres to strict quality management systems. Each batch is characterized using advanced analytical techniques including GPC, FT-IR, and NMR to confirm structure, molecular weight distribution, and functional group content. Certificates of Analysis (COA) detailing key parameters such as methoxy content, viscosity, and refractive index 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 under a dry inert atmosphere (e.g., nitrogen) to prevent moisture absorption and premature reaction of the methoxy terminal groups.

Specification

Item	Specification
Appearance	Clear, viscous liquid to resin
Identification (IR)	Conforms to structure
Viscosity (25°C)	Grade dependent (cSt)
Refractive Index (n20D)	Grade dependent
Methoxy Content	Grade dependent (%)
Phenyl Content	Grade dependent (%)
Volatile Matter	≤ 2.0%
Moisture (Karl Fischer)	≤ 0.5%

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