Description

Dimethyl-Diphenylpolysiloxane is a high-performance silicone fluid engineered for demanding applications requiring enhanced thermal stability and lubricity. This specialized copolymer combines the properties of dimethyl and diphenyl siloxane units, offering superior performance over standard polydimethylsiloxanes. It is a critical material for manufacturers in the aerospace, automotive, and specialty plastics industries seeking reliable high-temperature fluids and additives.

Application

• High-temperature lubricant and grease base fluid for aerospace and automotive components.
• Internal and external mold release agent for high-performance plastics and composite materials.
• Additive for improving the thermal stability and lubricity of industrial oils and greases.
• Heat transfer fluid in specialized closed-loop systems.
• Plasticizer and processing aid for high-temperature silicone rubber and other elastomers.
• Defoamer component for high-temperature industrial processes.
• Base material for formulating protective coatings and sealants with enhanced temperature resistance.
• Dielectric fluid in specialized electrical applications.

Basic Information

Product Name	Dimethyl-Diphenylpolysiloxane
CAS No.	68083-14-7
Molecular Formula	(C6H5)x(CH3)ySiOz (Copolymer)
Molecular Weight	Varies by grade and viscosity
Synonyms	Polydimethyl Diphenyl Siloxane; Diphenyl Dimethyl Polysiloxane; Phenylmethyl Silicone Fluid; Methyl Phenyl Siloxane Copolymer; Silicone Oil 556; Dow Corning 550 Fluid (example trade name); Phenyl Modified Silicone Oil; Diphenyl Siloxane-Dimethyl Siloxane Copolymer
EINECS	Contact for details

Quality Control

Our Dimethyl-Diphenylpolysiloxane is manufactured under a strict quality management system. Each batch undergoes comprehensive analytical testing to ensure consistent viscosity, phenyl content, thermal stability, and purity. Certificates of Analysis (COA) detailing key 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, well-ventilated area at room temperature (15-25°C). Keep away from strong oxidizing agents and sources of ignition.

Specification

Item	Specification
Appearance	Clear, colorless to pale yellow viscous liquid
Identification (IR)	Conforms to structure
Viscosity (25°C)	Grade dependent (e.g., 100 - 100,000 cSt)
Phenyl Content	Grade dependent (e.g., 5 - 25 mol%)
Refractive Index (25°C)	1.46 - 1.55
Specific Gravity (25°C)	0.98 - 1.10
Flash Point	> 300 °C
Volatile Content	< 1.0%

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