Description

Cyclopentasiloxane, 2,4,6,8,10-Pentamethyl-2,4,6,8,10-Pentaphenyl- CAS NO 34239-75-3 is a high-purity, specialty organosilicon compound belonging to the phenyl-modified cyclosiloxane family. This product is valued for its unique combination of thermal stability, optical clarity, and compatibility with a wide range of organic polymers and resins. It serves as a critical performance additive and intermediate for manufacturers in advanced material sectors, including high-performance silicones, optical encapsulants, and specialty coatings.

Application

• High-Temperature Silicone Elastomers: Acts as a reactive intermediate or plasticizer to enhance thermal stability and flexibility in demanding applications.
• LED Encapsulation & Optical Materials: Used in formulations for lenses and encapsulants due to its excellent light transmission and resistance to yellowing.
• Specialty Release Coatings & Molding Agents: Imparts superior release properties and surface smoothness in industrial molding processes.
• Personal Care & Cosmetic Ingredients: Functions as an emollient and carrier in high-end cosmetic formulations, providing a non-greasy, silky feel.
• Polymer Modification & Additive: Incorporated into engineering plastics and resins to improve processing characteristics and final material properties.
• Pharmaceutical & Biomedical Intermediates: Serves as a key synthon in the production of specialized silicone-based biomaterials.

Basic Information

Product Name	Cyclopentasiloxane, 2,4,6,8,10-Pentamethyl-2,4,6,8,10-Pentaphenyl-
CAS No.	34239-75-3
Molecular Formula	C35H40O5Si5
Molecular Weight	685.1 g/mol
Synonyms	Pentaphenylpentamethylcyclopentasiloxane; Decaphenylpentamethylcyclopentasiloxane; 2,4,6,8,10-Pentamethyl-2,4,6,8,10-pentaphenyl-1,3,5,7,9,2,4,6,8,10-pentaoxapentasilecane; Cyclopentasiloxane, pentamethyl pentaphenyl-; Phenyl-modified D5; D5-Phenyl
EINECS	Contact for details

Quality Control

Our Cyclopentasiloxane, 2,4,6,8,10-Pentamethyl-2,4,6,8,10-Pentaphenyl- is manufactured under strict quality management systems. Each batch undergoes rigorous analytical testing, including GC, HPLC, and NMR, to ensure identity, purity, and consistency. We provide comprehensive Certificates of Analysis (COA) with every shipment, detailing all critical specifications. Our production adheres to ISO 9001 standards, and we support compliance with global regulatory frameworks such as 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 and incompatible organic solvents. For long-term storage, consider an inert atmosphere (nitrogen blanket) to maintain optimal purity.

Specification

Item	Specification
Appearance	Colorless to pale yellow viscous liquid
Identification (IR)	Conforms to reference spectrum
Assay (GC)	≥ 98.0%
Refractive Index (n20D)	1.520 - 1.530
Density (g/mL, 25°C)	1.05 - 1.15
Water Content (KF)	≤ 0.1%

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