Description

3,5-Diphenyloctamethyltetrasiloxane is a specialized organosilicon compound belonging to the class of phenyl-modified siloxanes. This chemical is valued for its unique combination of thermal stability, low-temperature flexibility, and compatibility with organic polymers, making it a versatile intermediate and performance additive. It is primarily sought after by manufacturers in the silicone elastomer, high-performance lubricant, and advanced material sectors seeking to enhance product properties.

Application

• As a reactive intermediate or chain extender in the synthesis of specialty phenyl-containing silicone polymers and copolymers.
• As a modifying agent to improve the thermal stability and radiation resistance of silicone elastomers and resins.
• As a base fluid or additive in high-temperature lubricants and greases for demanding industrial applications.
• As a plasticizer or processing aid for high-performance plastics and rubber compounds to enhance flexibility and flow characteristics.
• In the formulation of release agents and mold-making materials where high-temperature performance is critical.
• As a component in dielectric fluids and potting compounds for electronics requiring stable electrical properties over a wide temperature range.
• In research and development for creating novel silicone-based materials with tailored surface properties.

Basic Information

Product Name	3,5-Diphenyloctamethyltetrasiloxane
CAS No.	13270-97-8
Molecular Formula	C20H34O3Si4
Molecular Weight	458.88 g/mol
Synonyms	1,1,1,3,5,5,5-Heptamethyl-3-phenyltrisiloxane; Octamethyl-3,5-diphenyltetrasiloxane; Tetrasiloxane, 3,5-diphenyloctamethyl-; 1,3-Bis(trimethylsiloxy)-1,3-diphenyldimethyldisiloxane; Phenyl Modified Siloxane; Dow Corning® 556 Fluid (related trade series); Phenylmethylsiloxane
EINECS	Contact for details

Quality Control

Our production of 3,5-Diphenyloctamethyltetrasiloxane adheres to stringent quality management protocols to ensure batch-to-batch consistency and high purity. Each lot is analyzed against comprehensive specifications using advanced techniques such as GC, HPLC, and NMR. A Certificate of Analysis (COA) detailing purity, identity, and key physical properties is provided with every shipment to support your quality assurance and regulatory compliance needs.

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. Under recommended storage conditions, the product is stable for extended periods.

Specification

Item	Specification
Appearance	Colorless to pale yellow clear liquid
Identification (IR)	Conforms to structure
Assay (GC)	≥ 97.0%
Refractive Index (n20D)	1.480 - 1.490
Density (20°C)	0.98 - 1.02 g/mL
Water Content (KF)	≤ 0.1%

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