Description

Eicosamethylcyclodecasiloxane is a high-purity, cyclic siloxane oligomer with the CAS registry number 18772-36-6. This specialized organosilicon compound serves as a critical intermediate and functional additive, valued for its unique silicone backbone and predictable molecular weight. It is essential for manufacturers and R&D laboratories in the personal care, specialty polymers, and advanced materials sectors seeking to enhance product performance and develop novel silicone-based formulations.

Application

• Personal Care & Cosmetics: Acts as a volatile carrier, emollient, and conditioning agent in antiperspirants, deodorants, and skin care products, providing a dry, silky feel.
• Silicone Fluids & Elastomers: Serves as a reactive intermediate or chain extender in the synthesis of custom silicone polymers, oils, and high-consistency rubber (HCR).
• Release Agents & Lubricants: Used as a base component or modifier in formulating non-stick coatings and high-temperature lubricants for industrial molding.
• Surface Treatment: Functions as a precursor for creating hydrophobic and oleophobic surface coatings on textiles, paper, and various substrates.
• Pharmaceutical & Medical Devices: Employed as an excipient or processing aid in topical drug delivery systems and for coating medical components.
• Electronics & Electrical: Utilized in potting compounds, encapsulants, and thermal interface materials due to its stability and dielectric properties.
• Research & Development: A key building block in academic and industrial R&D for synthesizing novel siloxane architectures and hybrid materials.

Basic Information

Product Name	Eicosamethylcyclodecasiloxane
CAS No.	18772-36-6
Molecular Formula	C20H60O10Si10
Molecular Weight	741.55 g/mol
Synonyms	Decamethylcyclopentasiloxane, Dimer; Cyclic Decamer of Dimethylsiloxane; D10; Decamer; 2,2,4,4,6,6,8,8,10,10,12,12,14,14,16,16,18,18,20,20-Eicosamethyl-1,3,5,7,9,11,13,15,17,19,2,4,6,8,10,12,14,16,18,20-decaoxacycloeicosasiloxane; Cyclopentasiloxane, decamethyl-, dimer; PDMS cyclic decamer
EINECS	Contact for details

Quality Control

Our Eicosamethylcyclodecasiloxane is produced under a strict quality management system. Each batch undergoes rigorous analytical testing, including Gas Chromatography (GC) and Nuclear Magnetic Resonance (NMR), to ensure high purity and consistent molecular composition. Certificates of Analysis (COA) detailing purity, identity, and key physical parameters are provided with every shipment to support your quality assurance protocols.

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, strong bases, and oxidizing agents. Under recommended storage conditions, the product is stable for extended periods.

Specification

Item	Specification
Appearance	Colorless to pale yellow liquid
Identification (IR)	Conforms to structure
Assay (GC)	≥ 95.0%
Refractive Index (n20D)	1.395 - 1.400
Density (20°C)	0.95 - 0.98 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.