A volatile cyclic silicone, also called D5, used to improve spreading and product slip.
Sources: 1D5, Decamethylcyclopentasiloxane
Not assessed
No pregnancy- or breastfeeding-specific assessment has been completed for this record. A cosmetic safety review is not a pregnancy rating.
Not assessed
Cyclopentasiloxane
What it does
Helps a formula spread smoothly and then partly evaporates, changing its after-feel.
Sources: 1Good for
- Spreadability and light finish
How to use it
Use the finished product as directed and follow spray or inhalation precautions where applicable.
Sources: 1Who should be careful
Do not confuse a volatile carrier with a long-lasting barrier treatment. Inhalation exposure requires separate assessment for spray formats.
Sources: 1Pairs well with
No supported pairings have been documented for this record.
Usage, safety and formulation details
Mechanism of action
A cyclic siloxane structure gives a low-surface-tension, volatile carrier.
Sources: 1Potential adverse effects
Exposure format and other ingredients influence tolerance; a smooth feel does not establish safety of every formulation.
Sources: 1Formulation considerations
Environmental restrictions can differ between rinse-off and leave-on products and change over time. Verify current regional requirements.
Sources: 1Pregnancy and breastfeeding
Not assessed
No pregnancy- or breastfeeding-specific assessment has been completed for this record. A cosmetic safety review is not a pregnancy rating.
Safety tags
- Fragrance allergen
- Not assessed
Not separately assessed in this draft.
- Essential oil
- Not assessed
Not separately assessed in this draft.
- Drying alcohol
- Not assessed
Not separately assessed in this draft.
- May irritate sensitive skin
- Not assessed
Not separately assessed in this draft.
What remains uncertain
- Exact concentration, final pH and the full composition of any unprovided finished product
Clinical evidence and research
Clinical evidence
Evidence for its main benefitNot assessed
The cited references support identity, formulation role or safety context. No standalone clinical efficacy rating has been completed for the main benefit in this draft.
Sources: 1Regulation and ingredient label names
Regulatory information
No jurisdiction-specific assessment is recorded. An inventory listing is not blanket approval.
Names on ingredient lists
cyclopentasiloxane
Chemical identity and molecular structure
Chemical information
Chemical structure
No single structure to show yet
A reviewed, unambiguous PubChem compound identifier is needed before a molecular diagram can be displayed.
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Content updated 9 November 2026.
Sources (1)
Scientific sources
- CIR: Safety assessment of cyclomethicones including cyclopentasiloxanesafety assessment · 2011
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