CYCLOPENTASILOXANE- ▸ 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.
- ▸ Safety Data Sheet (SDS) PDF · SDS
- ▸ Technical Data Sheet (TDS) PDF · TDS
- ▸ Typical Certificate of Analysis (CoA) PDF · COA
Values shown are typical for the current commercial grade. A lot-specific Certificate of Analysis accompanies every shipment; the grade-specific SDS is 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.
Request SDS →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.
Regulatory & registration requirements
- TSCA (US):
- REACH (EU):
- EC number: 208-764-9
Source: EPA TSCA Inventory (July 2025 release) · ECHA CHEM — retrieved 2026-07-12
Regulatory restriction status
Cyclopentasiloxane (Decamethylcyclopentasiloxane, D5) (CAS 541-02-6) appears on the regulatory list(s) below. This is public regulatory information about the substance — not a statement about any specific supplier’s material, and not a safety claim. Confirm the current status for your jurisdiction and intended use.
- REACH SVHC Candidate List (EU): listed 27 Jun 2018 on the basis of PBT (Art. 57(d)), vPvB (Art. 57(e)). SVHC status triggers EU supplier-communication and notification duties above 0.1% w/w; it is not, by itself, a ban on sale.
Sources: ECHA Candidate List / Annex XIV / Annex XVII (echa.europa.eu); U.S. EPA TSCA; UN Stockholm Convention / EU POPs Regulation; California OEHHA Proposition 65 list. Retrieved 2026-07-13.
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.
What is the REACH and TSCA regulatory status of Cyclopentasiloxane (Decamethylcyclopentasiloxane, D5)?
Cyclopentasiloxane (Decamethylcyclopentasiloxane, D5) (CAS 541-02-6) is subject to U.S. TSCA Inventory requirements; supplying it into the EU requires valid REACH registration ((EC) No 1907/2006). RawSource cannot verify a third-party supplier's registrations — buyers should require documented TSCA and REACH compliance for their jurisdiction and volume (EC 208-764-9).