Description

Siloxanes And Silicones, Me Methoxy, Polymers With Me Silsesquioxanes is a specialized organosilicon copolymer that combines the properties of methoxy-functional siloxanes with methyl silsesquioxane (MeSiO1.5) cage structures. This unique hybrid architecture provides enhanced thermal stability, mechanical reinforcement, and versatile reactivity for advanced material formulations. It is a critical raw material for industries requiring high-performance coatings, adhesives, and composite materials where durability and tailored surface properties are paramount.

Application

• High-Temperature Resistant Coatings: Used as a binder or additive in protective coatings for automotive, aerospace, and industrial equipment.
• Electronic Encapsulants & Underfills: Provides excellent dielectric properties, moisture resistance, and stress relief in semiconductor packaging.
• Reinforcing Agent for Silicone Elastomers: Enhances the mechanical strength, tear resistance, and thermal stability of silicone rubbers.
• Adhesion Promoters & Primers: Improves bonding between organic polymers and inorganic substrates like glass, metals, and ceramics.
• Low-k Dielectric Materials: Serves as a precursor for spin-on dielectric films in microelectronics due to its low dielectric constant.
• Hydrophobic & Release Coatings: Imparts water repellency and non-stick properties to textiles, paper, and molds.
• Hybrid Organic-Inorganic Composites (ORMOSIL): A key component in synthesizing optically transparent, mechanically robust composite materials.

Basic Information

Product Name	Siloxanes And Silicones, Me Methoxy, Polymers With Me Silsesquioxanes
CAS No.	68037-85-4
Molecular Formula	(C4H12O3Si)x•(CH3SiO1.5)y (Polymeric mixture)
Molecular Weight	Varies (Polymeric mixture)
Synonyms	Methoxypolysiloxane-methylsilsesquioxane copolymer; Methyl methoxy siloxane-silsesquioxane polymer; Poly(methyl methoxy siloxane-co-methyl silsesquioxane); Methoxy-functionalized polymethylsilsesquioxane; PMSSQ-MPS copolymer; Silicone resin with methoxy and silsesquioxane groups; Organosilicon copolymer 68037-85-4
EINECS	Contact for details

Quality Control

Our production of Siloxanes And Silicones, Me Methoxy, Polymers With Me Silsesquioxanes adheres to strict quality management protocols. Each batch undergoes rigorous analytical testing, including determination of methoxy content, molecular weight distribution (GPC), viscosity, and residual solvent analysis, to ensure consistency and performance. Certificates of Analysis (COA) documenting these specifications are available upon request, supporting compliance in demanding industrial and electronic applications.

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 condensation reactions.

Specification

Item	Specification
Appearance	Colorless to pale yellow viscous liquid or resin
Identification (IR)	Conforms to structure
Methoxy Content (CH3O-)	10 - 25 % (w/w)
Non-volatile Content	≥ 95 %
Viscosity (25°C)	500 - 5000 mPa·s (Grade dependent)
Specific Gravity (25°C)	0.95 - 1.05
Moisture Content (KF)	≤ 0.5 %

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