Description

Siloxanes And Silicones, Di-Me, Polymers With Me Ph Silsesquioxanes is a specialized organosilicon copolymer that combines the properties of polydimethylsiloxane (PDMS) with methyl phenyl silsesquioxane units. This unique hybrid structure offers enhanced thermal stability, refractive index control, and compatibility with a wide range of materials compared to standard silicones. It is a critical performance additive for industries requiring advanced material properties, such as high-temperature resistant coatings, optical encapsulants, and specialty release agents. The product is identified by CAS No. 68440-81-3.

Application

• High-Performance Coatings & Resins: Used as a modifier to improve thermal stability, weatherability, and gloss in protective and decorative coatings.
• Optical & Electronic Encapsulants: Serves as a matrix or additive in LED encapsulants and potting compounds, offering excellent clarity and thermal shock resistance.
• Specialty Release Agents: Provides non-stick, high-temperature release properties for molding processes in rubber, plastics, and composites.
• Adhesives & Sealants: Imparts flexibility, moisture resistance, and adhesion promotion in high-performance silicone and hybrid adhesive formulations.
• Personal Care & Cosmetics: Functions as a film-forming agent and emollient in hair care and skincare products for a silky, non-greasy feel.
• Industrial Lubricants & Greases: Enhances the thermal and oxidative stability of lubricants for high-temperature applications.

Basic Information

Item	Details
Product Name	Siloxanes And Silicones, Di-Me, Polymers With Me Ph Silsesquioxanes
CAS No.	68440-81-3
Molecular Formula	Typically represented as (C2H6OSi)x(C7H8OSi)y
Molecular Weight	Variable (Polymer)
Synonyms	Dimethyl Silicone-Methyl Phenyl Silsesquioxane Copolymer; Methyl Phenyl Silsesquioxane-Dimethylsiloxane Copolymer; Phenylmethylsilsesquioxane-Dimethylsiloxane Copolymer; PMSSQ-PDMS Copolymer; Silicone Resin Modifier; Organosiloxane Copolymer; Phenyl Modified Silicone Fluid; High Refractive Index Silicone
EINECS	Contact for details

Quality Control

Our production of Siloxanes And Silicones, Di-Me, Polymers With Me Ph Silsesquioxanes adheres to strict quality management protocols. Each batch undergoes rigorous analytical testing to ensure consistency in key parameters such as viscosity, refractive index, phenyl content, and thermal stability. A comprehensive Certificate of Analysis (COA) documenting these results is provided with every shipment to guarantee product integrity and support your quality assurance processes.

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). Keep away from strong acids and organic solvents. For long-term storage, consider using an inert atmosphere (nitrogen blanket) to prevent potential oxidation or viscosity changes.

Specification

Item	Specification
Appearance	Clear, colorless to pale yellow viscous liquid
Viscosity (25°C)	100 - 10,000 cSt (Grade Dependent)
Refractive Index (n20D)	1.42 - 1.48
Phenyl Content	5 - 30% (Grade Dependent)
Volatile Content	≤ 2.0%
Specific Gravity (25°C)	0.98 - 1.10

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