Description

Pentamethylcyclopentasiloxane is a high-purity, volatile cyclic siloxane compound. It serves as a versatile intermediate and functional fluid valued for its excellent volatility, thermal stability, and compatibility with organic systems. This chemical is essential for manufacturers in the personal care, electronics, and specialty polymer industries seeking to enhance product performance and process efficiency.

Application

• Personal Care & Cosmetics: Acts as a volatile carrier and emollient in antiperspirants, deodorants, and skin care products, providing a dry, non-greasy feel.
• Silicone Fluids & Elastomers: Serves as a reactive intermediate or chain extender in the synthesis of modified silicone oils, resins, and cross-linked elastomers.
• Release Agents & Lubricants: Used as a component in mold release formulations and high-temperature lubricants due to its thermal stability and low surface tension.
• Electronics & Semiconductor: Employed as a solvent or processing aid in the manufacture of electronic coatings and for wafer cleaning applications.
• Water Repellents: Functions as a precursor or additive in formulations for textile and surface water repellent treatments.
• Pharmaceuticals: Utilized as an inert excipient or carrier in topical drug delivery systems.

Basic Information

Product Name	Pentamethylcyclopentasiloxane
CAS No.	6166-86-5
Molecular Formula	C10H30O5Si5
Molecular Weight	370.77 g/mol
Synonyms	Decamethylcyclopentasiloxane, D5; Cyclopentasiloxane, decamethyl-; 2,2,4,4,6,6,8,8,10,10-Decamethyl-1,3,5,7,9,2,4,6,8,10-pentaoxapentasilecane; Decamethylpentacyclosiloxane; D5 Siloxane; Cyclomethicone 5; Pentamer; Contact for additional synonyms.
EINECS	228-250-8

Quality Control

Our Pentamethylcyclopentasiloxane is produced under a strict quality management system. Every batch undergoes comprehensive analytical testing, including gas chromatography (GC), to ensure it meets stringent purity and consistency standards. A Certificate of Analysis (COA) detailing specific results for identity, assay, and impurity profiles is provided with each shipment to guarantee reliable quality and traceability for your formulations.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, well-ventilated area away from heat sources and open flame. Due to its highly volatile nature, ensure containers are kept tightly sealed when not in use to prevent evaporation and maintain product integrity. Recommended storage temperature is 15-25°C.

Specification

Item	Specification
Appearance	Colorless clear liquid
Identification (IR)	Conforms
Assay (GC)	≥ 98.0%
Refractive Index (n20D)	1.396 - 1.398
Specific Gravity (25°C)	0.955 - 0.960
Water Content (KF)	≤ 0.05%

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