Description

Silanol Terminated Diphenylsiloxane - Dimethylsiloxane Copolymers are a specialized class of reactive silicone polymers featuring terminal silanol (Si-OH) groups and a backbone incorporating both diphenylsiloxane and dimethylsiloxane units. This unique structure provides an exceptional balance of high-temperature stability, optical clarity, and compatibility with organic systems, making them invaluable as reactive intermediates and modifiers. They are primarily used by formulators and manufacturers in the advanced materials, electronics, and personal care industries seeking to enhance the thermal and mechanical properties of their products.

Application

• High-Performance Silicone Resins & Elastomers: As a reactive building block for synthesizing phenyl-containing silicone resins with superior thermal stability, UV resistance, and dielectric properties for coatings, encapsulants, and adhesives.
• Pressure-Sensitive Adhesives (PSAs): Used as a tackifier and modifier to improve high-temperature performance, adhesion to low-energy surfaces, and optical clarity in silicone PSAs for tapes and labels.
• Release Coatings: A key component in formulating premium solvent-based or solventless release liners, offering controlled release force and excellent stability.
• Optical & Electronic Encapsulation: For potting and protecting LEDs, sensors, and other electronic components due to its excellent transparency, thermal shock resistance, and low stress.
• Personal Care & Cosmetic Ingredients: Acts as a film-forming agent, conditioner, and volatile carrier in high-end hair care, sun care, and color cosmetic formulations, providing a silky, non-greasy feel.
• Rubber & Plastic Modification: As an additive to improve the processing, heat resistance, and surface characteristics of engineering plastics and specialty rubbers.

Basic Information

Product Name	Silanol Terminated Diphenylsiloxane - Dimethylsiloxane Copolymers
CAS No.	68951-93-9
Molecular Formula	(C12H10OSi)x(C2H6OSi)y
Molecular Weight	Varies by copolymer ratio (Contact for details)
Synonyms	Poly(dimethylsiloxane-co-diphenylsiloxane), α,ω-dihydroxy; Diphenylsiloxane-Dimethylsiloxane Copolymer, Silanol Terminated; Phenyl Methyl Silicone Fluid, Hydroxy Terminated; Reactive Phenyl Methyl Siloxane; Silanol-Functional Phenylmethylsiloxane; OH-Terminated Phenylmethylpolysiloxane; CAS 68951-93-9; Polydimethylsiloxane-co-polydiphenylsiloxane diol
EINECS	Contact for details

Quality Control

Our Silanol Terminated Diphenylsiloxane - Dimethylsiloxane Copolymers are manufactured under a strict quality management system. Each batch undergoes rigorous analytical testing to ensure consistent performance, including determination of silanol content, viscosity, refractive index, and compositional analysis. A comprehensive Certificate of Analysis (COA) detailing all specifications is provided with every shipment to guarantee compliance with your technical requirements.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C/59-77°F). This material is hygroscopic (moisture-sensitive); containers must be kept tightly sealed when not in use to prevent absorption of atmospheric moisture, which can affect reactivity and properties. Keep away from strong bases and acids.

Specification

Item	Specification
Appearance	Clear, colorless to pale yellow viscous liquid
Identification (IR)	Conforms to structure
Viscosity @ 25°C	Specification available upon request
Refractive Index @ 25°C	Specification available upon request
Silanol Content (OH Value)	Specification available upon request
Phenyl Content	Specification available upon request
Volatile Matter	< 1.0% (Typical)
Water Content (KF)	< 0.1% (Typical)

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