Description

Siloxanes And Silicones, Di-Me, Polymers With Me Silsesquioxanes, Ethoxy-Terminated is a specialized organosilicon polymer featuring a hybrid structure of polydimethylsiloxane (PDMS) and methyl silsesquioxane units, terminated with reactive ethoxy groups. This unique architecture provides a balance of silicone-like properties—such as flexibility, thermal stability, and water repellency—with enhanced compatibility and cross-linking potential via its ethoxy termini. It is a critical intermediate for formulators and manufacturers in the coatings, adhesives, sealants, and elastomers (CASE) industries, as well as for advanced material synthesis. The compound is identified by CAS No. 68554-66-5.

Application

• As a reactive modifier and cross-linking agent in high-performance silicone resins and hybrid organic-inorganic coatings.
• Key intermediate for formulating weather-resistant, hydrophobic protective coatings for construction, automotive, and aerospace components.
• Enhancing the thermal and mechanical properties of adhesives and sealants, particularly for demanding electronic encapsulation applications.
• Building block for synthesizing advanced silsesquioxane-based materials, including nanocomposites and porous polymers.
• Improving the surface release properties and durability of industrial and culinary release coatings and liners.
• Used in the development of tailored silicone elastomers with specific modulus and chemical resistance profiles.

Basic Information

Product Name	Siloxanes And Silicones, Di-Me, Polymers With Me Silsesquioxanes, Ethoxy-Terminated
CAS No.	68554-66-5
Molecular Formula	Contact for details
Molecular Weight	Variable (Polymer)
Synonyms	Ethoxy-Terminated Polydimethylsiloxane-co-Methylsilsesquioxane; Poly(dimethylsiloxane-co-methylsilsesquioxane), ethoxy-terminated; PDMS-co-MSSQ, ethoxy end-capped; Methyl silsesquioxane-dimethylsiloxane copolymer, ethoxy terminated; Siloxane-silsesquioxane hybrid polymer; Ethoxy-functionalized silicone resin; Reactive silicone oligomer; CAS 68554-66-5
EINECS	Contact for details

Quality Control

Our production of Siloxanes And Silicones, Di-Me, Polymers With Me Silsesquioxanes, Ethoxy-Terminated adheres to stringent quality management protocols. Each batch is characterized for critical parameters including viscosity, ethoxy content, molecular weight distribution, and residual solvents to ensure batch-to-batch consistency and performance reliability. Certificates of Analysis (COA) documenting these specifications are provided and can be tailored to meet specific customer or regulatory requirements.

Storage

Preserve in a tightly closed container, protected from light. This material is hygroscopic (moisture-sensitive). Store in a cool, dry, well-ventilated area at room temperature (15-25°C). Keep containers tightly sealed under an inert atmosphere (e.g., nitrogen) to prevent moisture absorption and premature reaction of the ethoxy groups. Isolate from strong acids, bases, and oxidizing agents.

Specification

Item	Specification
Appearance	Clear to slightly hazy viscous liquid
Viscosity (25°C)	Specification available upon request
Ethoxy Content	Specification available upon request
Non-Volatile Matter	> 95%
Molecular Weight (Mw)	Specification available upon request
Water Content	< 0.5% (Karl Fischer)

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