Description

Siloxanes And Silicones, Di-Me, Me Ph, Hydroxy-Terminated is a specialized organosilicon polymer featuring a dimethyl and methyl phenyl siloxane backbone with reactive hydroxyl end groups. This unique structure provides an exceptional balance of thermal stability, flexibility, and compatibility with a wide range of organic and inorganic materials. It is a critical intermediate and performance additive for formulators seeking to enhance the properties of coatings, adhesives, and elastomers. Key industries that rely on this material include advanced electronics, high-performance sealants, and specialty polymer manufacturing.

Application

• Silicone Resin & Rubber Modification: Acts as a reactive intermediate or chain extender to improve the thermal stability, refractive index, and mechanical properties of phenyl-containing silicone resins and high-temperature vulcanized (HTV) rubbers.
• Pressure-Sensitive Adhesives (PSAs): Incorporated to enhance high-temperature performance, adhesion to low-energy surfaces, and optical clarity in silicone-based PSAs for tapes and labels.
• Release Coatings: Used in the formulation of high-performance, phenyl-modified release liners for demanding applications requiring excellent thermal resistance.
• Electronic Encapsulants & Potting Compounds: Improves the thermal shock resistance, dielectric properties, and flexibility of protective materials for sensitive electronic components.
• Specialty Coatings: Serves as a key ingredient in high-temperature resistant, weatherable, and optically clear coatings for aerospace, automotive, and industrial applications.
• Lubricant & Grease Additive: Imparts superior thermal-oxidative stability and wide-temperature performance to specialty lubricants and greases.

Basic Information

Product Name	Siloxanes And Silicones, Di-Me, Me Ph, Hydroxy-Terminated
CAS No.	68440-73-3
Molecular Formula	Typically represented as (C8H10OSi)x(C2H6OSi)y
Molecular Weight	Varies by chain length (Contact for details on specific grades)
Synonyms	Hydroxy-Terminated Methyl Phenyl Siloxane-Dimethyl Siloxane Copolymer; Poly(dimethylsiloxane-co-methylphenylsiloxane), hydroxy terminated; Phenyl Methyl Silicone Fluid, OH-terminated; Dimethyl, Methylphenyl Siloxane, Hydroxy End-blocked; OH-Terminated Phenylmethylsiloxane-Dimethylsiloxane Copolymer; Reactive Phenyl Silicone Oil; Silicone Intermediate 68440-73-3
EINECS	Contact for details

Quality Control

Our Siloxanes And Silicones, Di-Me, Me Ph, Hydroxy-Terminated is manufactured under a strict quality management system. Each batch undergoes comprehensive analytical testing to ensure consistency in hydroxyl value, viscosity, phenyl content, and molecular weight distribution. Certificates of Analysis (COA) documenting key specifications are provided with every shipment. We support our global clients with full regulatory documentation and can tailor quality parameters to meet specific application requirements.

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). This material is moisture-sensitive (hygroscopic); containers must be kept tightly sealed to prevent absorption of atmospheric moisture, which can affect reactivity. Keep away from strong acids, bases, and oxidizing agents.

Specification

Item	Specification
Appearance	Clear, colorless to pale yellow viscous liquid
Identification (IR)	Complies
Hydroxyl Value (mg KOH/g)	Contact for details
Viscosity @ 25°C (cSt)	Contact for details
Phenyl Content (mol%)	Contact for details
Water Content (KF)	< 0.1%
Specific Gravity @ 25°C	Contact for details
Refractive Index @ 25°C	Contact for details

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