Description

Vinyl Terminated Diphenylsiloxane, Dimethylsiloxane Copolymer is a specialized organosilicon polymer engineered for high-performance applications. This copolymer is valued for its unique combination of thermal stability, optical clarity, and enhanced mechanical properties imparted by the diphenylsiloxane units. It is a critical raw material for manufacturers in the electronics, advanced optics, and specialty elastomer sectors seeking to improve product durability and performance under demanding conditions.

Application

• High-Temperature Silicone Elastomers & Gaskets: Used as a reactive intermediate to formulate heat-resistant rubbers for automotive and aerospace seals.
• Optical Grade Encapsulants & Adhesives: Serves as a key component in transparent, stable potting compounds for LEDs and sensitive optical devices.
• Electronic Packaging & Conformal Coatings: Provides excellent dielectric properties and moisture resistance for protecting circuit boards and components.
• Pressure-Sensitive Adhesives (PSAs): Imparts superior tack and cohesive strength to specialty silicone adhesive tapes and labels.
• Release Coatings & Liners: Functions as a crosslinkable component in durable, high-performance release layers for industrial tapes.
• Modifier for Plastics & Resins: Enhances the flexibility, thermal stability, and surface properties of engineering thermoplastics and epoxy formulations.

Basic Information

Product Name	Vinyl Terminated Diphenylsiloxane, Dimethylsiloxane Copolymer
CAS No.	68951-96-2
Molecular Formula	Typically represented as (C6H5)2SiOx[(CH3)2SiO]y with terminal vinyl groups. Contact for details.
Molecular Weight	Varies by grade (typically 1,000 - 50,000 g/mol). Contact for details.
Synonyms	Vinyl-terminated diphenyl-dimethyl polysiloxane; Vinylphenyl silicone fluid; Poly(dimethylsiloxane-co-diphenylsiloxane), vinyl terminated; Vinylphenylmethyl polysiloxane; Diphenyl-dimethyl vinyl silicone copolymer; Vinyl Q resin intermediate; Phenylvinyl silicone oil; CAS 68951-96-2
EINECS	Contact for details.

Quality Control

Our Vinyl Terminated Diphenylsiloxane, Dimethylsiloxane Copolymer is manufactured under a strict quality management system. Each batch undergoes rigorous analytical testing, including determination of vinyl content, viscosity, refractive index, and purity, to ensure consistency and performance. Certificates of Analysis (COA) documenting these specifications are available upon request to support your quality assurance protocols.

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 heat sources and incompatible materials. Under these conditions, the product is stable for extended periods.

Specification

Item	Specification
Appearance	Clear, colorless to pale yellow viscous liquid
Viscosity (25°C)	100 - 10,000 cSt (Grade dependent)
Vinyl Content (mmol/g)	0.2 - 2.0 (Grade dependent)
Refractive Index (n20D)	1.46 - 1.52
Specific Gravity (25°C)	0.98 - 1.10
Purity (by GC)	> 98.0%
Water Content	< 0.1%

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