Description

Heptamethylphenylcyclotetrasiloxane is a specialized organosilicon compound belonging to the class of phenyl-modified cyclic siloxanes. This chemical serves as a crucial intermediate and functional additive, valued for its unique combination of phenyl group stability and siloxane backbone flexibility. It is primarily utilized by manufacturers in the silicone polymers, personal care, and specialty coatings industries seeking to enhance thermal stability, refractive index, and compatibility in high-performance formulations.

Application

• Silicone Resin & Polymer Intermediate: A key building block for synthesizing phenyl-containing silicone resins, rubbers, and copolymers, imparting improved heat resistance and optical properties.
• Personal Care & Cosmetic Ingredients: Used in the formulation of premium hair care products (e.g., conditioners, shine serums) and skin care items as a conditioning agent and emollient with a silky feel.
• Release Coatings & Molding Agents: Functions as a component in high-temperature release coatings for industrial molding and baking applications.
• Specialty Additive for Coatings: Incorporated into protective and optical coatings to modify surface properties, enhance gloss, and improve weatherability.
• Dielectric & Electronic Encapsulation Materials: Contributes to the development of silicone gels and encapsulants with stable dielectric properties for electronics protection.
• Lubricant & Grease Formulation: Acts as a high-performance base fluid or additive in specialty lubricants requiring thermal and oxidative stability.

Basic Information

Product Name	Heptamethylphenylcyclotetrasiloxane
CAS No.	10448-09-6
Molecular Formula	C13H24O4Si4
Molecular Weight	356.68 g/mol
Synonyms	1,3,5,7-Tetramethyl-1,3,5,7-tetraphenylcyclotetrasiloxane; Cyclotetrasiloxane, 1,3,5,7-tetramethyl-1,3,5,7-tetraphenyl-; Tetraphenyltetramethylcyclotetrasiloxane; Phenylmethylcyclotetrasiloxane; DPh4 (common shorthand); Phenyl D4; Octaphenylcyclotetrasiloxane (common misnomer, verify structure); PMCS-104
EINECS	233-960-2

Quality Control

Our Heptamethylphenylcyclotetrasiloxane is produced under a strict quality management system. Each batch undergoes rigorous analytical testing, including GC, HPLC, and NMR, to ensure high purity and consistent performance. We provide comprehensive Certificates of Analysis (COA) with each shipment, detailing all relevant specifications. Our quality commitment aligns with cGMP principles where applicable, ensuring reliability for your critical synthesis and formulation processes.

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 viscous liquid
Identification (IR)	Conforms to structure
Assay (GC)	≥ 97.0%
Refractive Index (n20D)	1.480 - 1.495
Density (20°C)	1.05 - 1.15 g/cm³
Water Content (KF)	≤ 0.1%

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