Description

Phenylmethylsiloxane-Diphenylsiloxane Copolymer, 300-600 Cst is a high-performance silicone fluid engineered for demanding thermal and chemical environments. This copolymer is valued for its exceptional thermal stability, low volatility, and excellent lubricating properties over a wide temperature range. It is a critical material for formulators and manufacturers in the aerospace, electronics, and specialty lubricants industries seeking reliable performance under extreme conditions.

Application

• High-Temperature Lubricants & Greases: Serves as a base fluid or additive for lubricants requiring stability and low volatility in aerospace, automotive, and industrial equipment.
• Thermal Interface Materials (TIMs): Used as a carrier fluid in thermal pastes, gap fillers, and pads to enhance heat dissipation in electronics and power modules.
• Release Agents & Mold Lubricants: Provides excellent non-stick properties for plastics, rubber, and composite molding processes.
• Dielectric & Potting Compounds: Imparts moisture resistance and stable dielectric properties for protecting sensitive electronic components.
• Personal Care & Cosmetic Additives: Functions as an emollient and texture enhancer in high-end cosmetic formulations, providing a silky feel.
• Pressure-Sensitive Adhesives (PSAs): Modifies tack and flow properties in specialty adhesive formulations.
• Fiber & Textile Treatments: Used as a softening and water-repellent agent for technical textiles.
• Research & Development: Employed as a versatile intermediate or additive in the development of new polymeric materials and coatings.

Basic Information

Product Name	Phenylmethylsiloxane-Diphenylsiloxane Copolymer, 300-600 Cst
CAS No.	308073-01-0
Molecular Formula	(C6H5(CH3)SiO)x((C6H5)2SiO)y
Molecular Weight	Varies (Polymer)
Synonyms	Phenyl Methyl Siloxane Diphenyl Siloxane Copolymer; Diphenylmethylpolysiloxane; Phenylmethylsiloxane-Dimethylsiloxane-Diphenylsiloxane Copolymer; Phenylmethyl Diphenyl Siloxane Copolymer; Methyl Phenyl Silicone Fluid; Phenyldimethylpolysiloxane; Dow Corning 550 Fluid (Analog); Silicone Oil AR 200 (Analog)
EINECS	Contact for details

Quality Control

Our Phenylmethylsiloxane-Diphenylsiloxane Copolymer is manufactured under a strict quality management system. Each batch undergoes rigorous analytical testing to ensure consistency in viscosity, phenyl content, and purity. Certificates of Analysis (COA) documenting key physical and chemical parameters 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, well-ventilated area at room temperature (15-25°C). Keep away from strong oxidizing agents. Under these conditions, the product has excellent shelf stability.

Specification

Item	Specification
Appearance	Clear, colorless to pale yellow viscous liquid
Viscosity at 25°C	300 - 600 cSt
Specific Gravity (25°C)	1.00 - 1.10
Refractive Index (n20D)	1.46 - 1.50
Flash Point	> 300 °C
Phenyl Content	Contact for details
Volatile Content (%, 150°C, 3h)	< 1.0
Identification (IR)	Conforms

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