Description

Siloxanes and Silicones, di-Me, di-Ph, hydroxy-terminated, reaction products with chlorotrimethylsilane, hydrochloric acid, iso-Pr alc., sodium silicate and [(ethenyldimethylsilyl)oxy]-terminated di-Me, di-Ph siloxanes is a specialized, multi-component silicone copolymer designed for advanced material science applications. This engineered product offers a unique combination of phenyl and vinyl functionality, providing enhanced thermal stability, refractive index modification, and superior compatibility with organic matrices. It is essential for formulators and manufacturers seeking to create high-performance coatings, adhesives, sealants, and elastomers with tailored properties. The CAS number for this compound is 68440-63-1.

Application

• High-Temperature Resistant Coatings: Used as a key modifier in protective coatings for aerospace, automotive, and industrial equipment to improve thermal stability and weatherability.
• LED Encapsulants and Optical Adhesives: Imparts a high refractive index and excellent light transmission, making it ideal for potting and bonding components in optoelectronics and lighting.
• Specialty Silicone Elastomers (LSR/HCR): Serves as a reactive intermediate or additive to enhance the strength, heat resistance, and gas permeability of molded rubber parts.
• Pressure-Sensitive Adhesives (PSAs): Modifies tack, peel strength, and high-temperature performance of silicone-based adhesive tapes and labels.
• Release Coatings: Formulated into durable, high-performance release liners for labels, tapes, and composite manufacturing.
• Fiber Optic Coatings: Provides a protective, flexible primary coating with low moisture absorption and stable optical properties.
• Cosmetic & Personal Care: Acts as a film-forming agent and conditioner in long-wear makeup, sunscreens, and hair care products for a silky feel and water resistance.
• Composite Materials: Used as a coupling agent or resin modifier to improve the interfacial adhesion between inorganic fillers/fibers and organic polymer matrices.

Basic Information

Product Name	Siloxanes and Silicones, di-Me, di-Ph, hydroxy-terminated, reaction products with chlorotrimethylsilane, hydrochloric acid, iso-Pr alc., sodium silicate and [(ethenyldimethylsilyl)oxy]-terminated di-Me, di-Ph siloxanes
CAS No.	68440-63-1
Molecular Formula	Complex Copolymer (Contact for details)
Molecular Weight	Varies by grade (Contact for details)
Synonyms	Phenylmethylvinylsiloxane copolymer; Vinylphenylmethylsiloxane; Dimethyl diphenyl vinyl siloxane copolymer; Modified phenylmethylvinyl polysiloxane; Phenyl vinyl silicone fluid; Silicone resin containing phenyl and vinyl groups; Reactive phenylmethylvinylsiloxane oligomer; [(Ethenyldimethylsilyl)oxy]-terminated dimethyl diphenyl siloxane copolymer
EINECS	Contact for details

Quality Control

Our production of this advanced silicone copolymer adheres to strict quality management systems. Each batch is characterized for critical parameters including vinyl content, phenyl content, viscosity, and refractive index to ensure consistent performance in your formulations. A comprehensive Certificate of Analysis (COA) detailing these specifications is 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 heat, sparks, and open flame. This material is moisture-sensitive (hygroscopic); ensure containers are sealed tightly after use to prevent absorption of atmospheric moisture, which may affect reactivity and properties.

Specification

Item	Specification
Appearance	Clear, colorless to pale yellow viscous liquid
Viscosity (25°C)	500 - 5000 mPa·s (Grade dependent)
Refractive Index (n20D)	1.47 - 1.55
Vinyl Content (mmol/g)	0.5 - 3.0
Phenyl Content	10 - 40 % (w/w)
Hydroxyl Value	< 0.1 % (w/w)
Volatile Matter	< 1.0 % (w/w)
Specific Gravity (25°C)	1.00 - 1.10

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