Description

3-Phenyl-1,1,3,5,5-Pentamethyltrisiloxane is a specialized organosilicon compound featuring a phenyl group and a trisiloxane backbone. This unique structure makes it a valuable reactive intermediate and functional fluid in advanced silicone synthesis. It is primarily sought after by manufacturers in the silicone polymer and specialty chemical industries for its role in modifying material properties, such as refractive index, thermal stability, and surface characteristics.

Application

• Silicone Polymer Modification: Acts as a reactive monomer or chain extender to incorporate phenyl groups into silicone resins and elastomers, enhancing their optical clarity, thermal resistance, and radiation stability.
• High-Performance Lubricants & Greases: Used as a base fluid or additive in specialty lubricants requiring wide temperature performance and excellent dielectric properties.
• Release Agents & Moldmaking: Serves as a key component in high-temperature release coatings and mold-making materials for plastics and composites.
• Personal Care & Cosmetic Ingredients: Functions as a volatile carrier or emollient in high-end cosmetic formulations, providing a silky, non-greasy feel.
• Adhesives & Sealants: Incorporated to improve the flexibility, adhesion, and environmental resistance of silicone-based adhesive and sealant systems.
• Dielectric & Electronic Fluids: Utilized in heat transfer or insulating fluids for sensitive electronic applications due to its stable dielectric constant.
• Surface Treatment & Coatings: Employed as a precursor for surface modifying agents that impart water repellency and chemical resistance to various substrates.

Basic Information

Item	Details
Product Name	3-Phenyl-1,1,3,5,5-Pentamethyltrisiloxane
CAS No.	17962-34-4
Molecular Formula	C13H26O2Si3
Molecular Weight	298.60 g/mol
Synonyms	1,1,3,5,5-Pentamethyl-3-phenyltrisiloxane; Phenylpentamethyltrisiloxane; Trisiloxane, 3-phenyl-1,1,3,5,5-pentamethyl-; Dow Corning® 556 Fluid (related trade series); Phenyl MD'M; Phenyl Trisiloxane
EINECS	Contact for details

Quality Control

Our production of 3-Phenyl-1,1,3,5,5-Pentamethyltrisiloxane adheres to stringent quality management protocols. Every batch undergoes comprehensive analytical testing, including Gas Chromatography (GC) and Nuclear Magnetic Resonance (NMR), to ensure high purity and consistent chemical structure. Certificates of Analysis (COA) detailing purity, identity, and key physical properties are provided with each shipment to guarantee traceability and compliance with your technical requirements.

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, bases, and oxidizing agents. Under these conditions, the product is stable for extended periods.

Specification

Item	Specification
Appearance	Colorless to pale yellow clear liquid
Identification (IR)	Conforms to structure
Purity (GC)	≥ 97.0%
Refractive Index (n20D)	1.425 - 1.435
Density (25°C)	0.92 - 0.96 g/mL

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