Description

Cyclopentasiloxane CAS NO 294-40-6 is a clear, odorless, volatile cyclic silicone fluid, also known as D5. It serves as a versatile carrier and emollient, prized for its excellent spreading properties, low surface tension, and non-greasy feel. This high-purity organosilicon compound is essential for manufacturers in the personal care, cosmetics, and pharmaceutical industries seeking to enhance product performance and sensory characteristics.

Application

• Personal Care & Cosmetics: A key ingredient in deodorants/antiperspirants, skin creams, lotions, sunscreens, and color cosmetics (foundation, primers) for its smooth, dry application and volatile carrier properties.
• Hair Care Products: Used in conditioners, serums, and shine sprays to impart gloss, reduce frizz, and improve combability without buildup.
• Pharmaceutical Topicals: Functions as a carrier solvent in transdermal drug delivery systems and topical ointments due to its skin compatibility and evaporation profile.
• Industrial & Release Agents: Employed as a mold release agent in plastics and rubber manufacturing and as a component in defoamers.
• Lubricants & Polishes: Used in specialty lubricants and polishes for its thermal stability and water-repellent characteristics.

Basic Information

Product Name	Cyclopentasiloxane
CAS No.	294-40-6
Molecular Formula	C10H30O5Si5
Molecular Weight	370.77 g/mol
Synonyms	Decamethylcyclopentasiloxane; D5; Cyclomethicone 5; Pentamer; 2,2,4,4,6,6,8,8,10,10-Decamethyl-1,3,5,7,9,2,4,6,8,10-pentaoxapentasilecane; Cyclic Volatile Methylsiloxane cVMS; Dow Corning 245 Fluid; XIAMETER PMX-0245
EINECS	206-033-6

Quality Control

Our Cyclopentasiloxane is manufactured under strict quality management systems. Each batch undergoes rigorous analytical testing, including gas chromatography (GC), to ensure it meets high-purity specifications for cosmetic and pharmaceutical applications. Certificates of Analysis (COA) confirming identity, purity, and compliance with relevant standards are 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.

Specification

Item	Specification
Appearance	Clear, colorless liquid
Identification (IR)	Conforms
Assay (GC)	≥ 98.0%
Refractive Index (20°C)	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.