Silicone Fluids & Oils Available — Bulk Only

Cyclopentasiloxane (Decamethylcyclopentasiloxane, D5)

CAS 541-02-6 · Formula C10H30O5Si5 · MW 370.77 g/mol

A volatile cyclic silicone fluid prized as a fast-spreading carrier that flashes off cleanly without residue. It is used as a carrier, emollient, and solvent in personal-care products, as a dry-cleaning solvent, and as an intermediate in manufacturing higher-molecular-weight siloxane polymers.

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HS Code
2931.90
At a Glance
Material Family
Silicone Fluids & Oils
Record Type
Pure compound
Primary Role
Solvency · Emolliency
Functional Roles
CYCLOPENTASILOXANE
HAIR CONDITIONINGSKIN CONDITIONINGSKIN CONDITIONING - EMOLLIENTSOLVENT
Applications & Use Cases
  • Personal-care carrier: Volatile emollient, solvent, and viscosity-control fluid in skin, hair, and make-up products.
  • Dry-cleaning solvent: Silicone-based solvent for textile cleaning.
  • Siloxane intermediate: Feedstock for manufacturing high-molecular-weight silicone polymers.
  • Antiperspirant & aerosol vehicle: Carrier and end-blocking agent in antiperspirants and aerosol products containing insoluble powders.
Physical Properties
Physical Description
Colorless volatile liquid
Appearance
Colorless volatile liquid
Boiling Point
210 °C
Melting Point
-38 °C
Flash Point
73 °C (73 °C)
Solubility
In water, 1.7X10-2 mg/L at 25 °C
Density
0.9593 g/cu cm at 20 °C
Vapor Pressure
0.3 mm Hg at 25 °C
LogP
log Kow = 8.06 (average of 8.03, 8.07 and 8.09 measurements)
Henry's Law Constant
Henry's Law constant = 33.0 atm-cu m/mole at 25 °C
Viscosity
3.9 cSt at 25 °C
Heat of Vaporization
Enthalpy of vaporization: 60 kJ/mol
Surface Tension
18.5 dyne/cm at 25 °C
Refractive Index
Index of refraction = 1.3982 at 20 °C/D
Safety & Handling
Full SDS available on request

A grade-specific Safety Data Sheet (SDS) — with the complete hazard classification, handling precautions, and transport information — is supplied with every shipment and available on request. Confirm all safety and regulatory details against the SDS for your specific grade.

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HS / Tariff Classification
Harmonized System (HS) Code — 6-digit international heading
2931 . 90
Chapter 29
Organic chemicals
Heading 29.31
Internationally harmonized (WCO HS)
Subheading 2931.90
6-digit international code — national tariff line adds further digits
Chemical Identity
CAS Number
541-02-6
Molecular Formula
C10H30O5Si5
Molecular Weight
370.77 g/mol
IUPAC Name
2,2,4,4,6,6,8,8,10,10-decamethyl-1,3,5,7,9,2,4,6,8,10-pentaoxapentasilecane
INCI Name
CYCLOPENTASILOXANE
PubChem CID
InChI Key
XMSXQFUHVRWGNA-UHFFFAOYSA-N
H-Bond Donor / Acceptor
0 / 5
Synonyms & Trade Names
DECAMETHYLCYCLOPENTASILOXANE Cyclomethicone 5 Dimethylsiloxane pentamer Cyclic dimethylsiloxane pentamer Silicon SF 1202 Ciclopentasiloxane Cyclomethicone D5 Dekamethylcyklopentasiloxan D5-sil KF 995 VS 7158 SF 1202 JEESILC CPS-211 XIAMETER PMX-0245 Dow corning 345 NUC silicone VS 7158 Cyclopentasiloxane, 2,2,4,4,6,6,8,8,10,10-decamethyl- DOW CORNING ST CYCLOMETHICONE 5
Full Description

Cyclopentasiloxane (CAS 541-02-6), the cyclic siloxane decamethylcyclopentasiloxane or D5, is a volatile, low-viscosity silicone fluid (C10H30O5Si5). It is used as a carrier, emollient, and solvent in personal-care products, as a dry-cleaning solvent, and as an intermediate in manufacturing higher-molecular-weight siloxane polymers.

Frequently Asked Questions

Is cyclopentasiloxane the same as silicone?

Cyclopentasiloxane (D5, CAS 541-02-6) is a specific volatile cyclic silicone fluid (decamethylcyclopentasiloxane, C10H30O5Si5), not silicone in general. "Silicone" is a broad family of siloxane materials; D5 is one low-molecular-weight, volatile member and is also used as a feedstock to make higher-molecular-weight silicone polymers.

What is cyclopentasiloxane used for?

Cyclopentasiloxane (D5) is used as a volatile carrier, emollient, and viscosity-control fluid in skin, hair, and make-up products, as a silicone-based dry-cleaning solvent, and as an intermediate for high-molecular-weight siloxane polymers. It is also used as a carrier and end-blocking agent in antiperspirants and aerosol products.

Is cyclopentasiloxane water soluble?

No. D5 is a low-viscosity silicone fluid that is not water soluble; it is miscible with other silicones and nonpolar solvents and evaporates cleanly, which is why it works as a volatile carrier. See the product SDS for full solubility and handling data.

What grade and packaging does RawSource supply cyclopentasiloxane in?

RawSource distributes D5 cyclopentasiloxane as a volatile, low-viscosity fluid in industrial quantities, classified under HS code 2931.90 (organo-silicon compounds). Grade documentation, packaging, and lot size are confirmed per order, with a CoA and SDS provided.

What is the cost of bulk cyclopentasiloxane (D5)?

Bulk D5 pricing varies by packaging, order volume, and destination and is quoted per order rather than published. Submit a bulk RFQ with your quantity and spec and RawSource will return current pricing.

Disclaimer. Information on this page — including properties, identifiers, hazard, transport (DOT/UN) and tariff (HS) classifications, and applications — is provided for general reference and is compiled from authoritative public sources (e.g. PubChem/ECHA, 49 CFR 172.101, the Harmonized Tariff Schedule). Values are typical and are not a guaranteed specification; the Certificate of Analysis (CoA) for the lot purchased governs. Products are sold for industrial and professional use only. Nothing here is a medical, health, or efficacy claim or advice. Always consult the current Safety Data Sheet (SDS) before handling, storage, transport or disposal, and confirm regulatory status, classification and suitability for your application and jurisdiction. Hazard, transport and tariff classifications must be verified for your specific shipment. RawSource makes no warranty, express or implied, and assumes no liability for use of this information. Trademarks. Third-party trademarks and brand names are the property of their respective owners; any reference is nominative — used only to identify a comparable product — and does not imply affiliation with, sponsorship by, or endorsement by the trademark owner.