Description

Trimethyl Pentaphenyl Trisiloxane is a high-purity organosilicon compound characterized by its unique phenyl-substituted trisiloxane structure. This chemical serves as a versatile intermediate and functional additive, offering enhanced thermal stability and compatibility in advanced material formulations. It is primarily utilized by manufacturers in the silicone polymers, high-performance lubricants, and specialty coatings industries seeking to improve product properties.

Application

• As a key monomer or cross-linking agent in the synthesis of specialty phenyl-containing silicone resins and elastomers.
• As a high-temperature stable base fluid or additive in advanced lubricants and greases for demanding industrial applications.
• As a modifying agent in protective and release coatings to enhance heat resistance and surface properties.
• As an intermediate for further chemical synthesis in pharmaceutical and agrochemical active ingredients.
• As a component in dielectric fluids and encapsulants for the electronics industry.
• In research and development for novel material science applications, including liquid crystals and optical materials.

Basic Information

Product Name	Trimethyl Pentaphenyl Trisiloxane
CAS No.	28855-11-0
Molecular Formula	C33H36O2Si3
Molecular Weight	548.90 g/mol
Synonyms	Trisiloxane, 1,1,1,3,5,5,5-heptamethyl-3,3-diphenyl-; 1,1,1,3,5,5,5-Heptamethyl-3,3-diphenyltrisiloxane; Pentaphenyltrimethyltrisiloxane; Heptamethyl-diphenyl-trisiloxane; Phenyl Modified Trisiloxane; Dow Corning® 556 Fluid (related trade series); Phenyltrisiloxane; Contact for additional trade names.
EINECS	Contact for details

Quality Control

Our Trimethyl Pentaphenyl Trisiloxane is manufactured under a strict quality management system. Every batch undergoes comprehensive analytical testing, including assay and impurity profile determination via chromatographic methods, to ensure it meets precise customer specifications and internal standards. A Certificate of Analysis (COA) detailing purity, identity, and physical properties is provided with each shipment and is available upon request.

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, strong acids, and strong bases.

Specification

Item	Specification
Appearance	Colorless to pale yellow clear liquid
Identification (IR)	Conforms to reference spectrum
Assay (GC/HPLC)	≥ 97.0%
Refractive Index (n20D)	1.520 - 1.530
Density (g/mL, 20°C)	1.05 - 1.10

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