Description

Dimethylsiloxane, Diphenyl, Vinyl-Terminated is a specialized silicone polymer featuring a mixed methyl and phenyl backbone with reactive vinyl end groups. This unique structure provides an exceptional balance of high-temperature stability, low-temperature flexibility, and enhanced compatibility with various substrates. It is a critical intermediate for formulators and manufacturers requiring advanced silicone properties. Key industries that rely on this material include high-performance elastomers, advanced adhesives, and specialty coatings.

Application

• Primary component in the synthesis of high-consistency rubber (HCR) and liquid silicone rubber (LSR) for demanding applications.
• Key intermediate for manufacturing phenyl-containing silicone pressure-sensitive adhesives (PSAs) with enhanced thermal and UV stability.
• Base polymer for high-temperature gaskets, seals, and O-rings used in aerospace and automotive engine compartments.
• Essential raw material in potting and encapsulation compounds for electronics requiring a wide service temperature range.
• Used in the formulation of release coatings and mold-making materials where superior heat resistance is needed.
• Modifier for epoxy and other thermoset resins to improve flexibility, thermal shock resistance, and moisture barrier properties.
• Building block for custom silicone gels and damping materials used in specialized industrial applications.

Basic Information

Product Name	Dimethylsiloxane, Diphenyl, Vinyl-Terminated
CAS No.	68951-94-0
Molecular Formula	(C6H5)x(CH3)y(C2H3)zSiOn
Molecular Weight	Varies by phenyl content and chain length. Contact for details.
Synonyms	Vinylphenylmethylsiloxane; Vinyl-terminated diphenyl-dimethyl polysiloxane; Phenylmethylvinylsiloxane copolymer; Vinyl Phenyl Silicone Fluid; Vinyl Q resin intermediate; Poly(diphenylsiloxane-co-dimethylsiloxane), vinyl-terminated; Reactive phenylmethyl silicone polymer
EINECS	Contact for details.

Quality Control

Our Dimethylsiloxane, Diphenyl, Vinyl-Terminated is manufactured under a strict quality management system. Each batch is analyzed to ensure consistent performance, with key parameters including vinyl content, phenyl content, viscosity, and refractive index monitored. Certificates of Analysis (COA) documenting these specifications are provided with every shipment. We support compliance with relevant global regulatory frameworks, including REACH.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). Keep away from strong acids, strong bases, and organic solvents. For long-term storage, consider maintaining under an inert atmosphere (e.g., nitrogen) to preserve vinyl functionality. Keep container tightly sealed when not in use to prevent moisture absorption.

Specification

Item	Specification
Appearance	Clear, colorless to pale yellow viscous liquid
Identification (IR)	Conforms to structure
Viscosity (25°C)	Specification available upon request
Vinyl Content	Specification available upon request
Phenyl Content	Specification available upon request
Refractive Index (n20D)	Specification available upon request
Specific Gravity (25°C)	Specification available upon request
Volatile Content	≤ 1.0%

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