CYCLOPENTASILOXANE
Decamethylcyclopentasiloxane
CYCLOPENTASILOXANE is listed in the EU CosIng inventory, but no direct annex records are linked on this page yet.
Regulatory evidence by market
This matrix separates verified ingredient rules from sources that are mapped but not yet imported. No imported rule does not mean the ingredient is permitted.
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| Market | Evidence status | Records | Source language |
|---|---|---|---|
| European Union | Source mapped Inventory entry; no linked annex rule | 0 | English and EU languages |
| Great Britain | Source mapped Official source mapped; ingredient rule not imported | 0 | English |
| Canada | Source mapped Official source mapped; ingredient rule not imported | 0 | English and French |
| New Zealand | Source mapped Official source mapped; ingredient rule not imported | 0 | English |
| ASEAN | Source mapped Official source mapped; ingredient rule not imported | 0 | English and national languages |
| China | Source mapped Official source mapped; ingredient rule not imported | 0 | Chinese with selected English material |
| Japan | Source mapped Official source mapped; ingredient rule not imported | 0 | Japanese; official English translation available |
| South Korea | Evidence linked Restricted Open this evidence | 1 | Korean with some English names |
| United States | Source mapped Official source mapped; ingredient rule not imported | 0 | English |
| Australia | Source mapped Official source mapped; ingredient rule not imported | 0 | English |
| Brazil | Source mapped Official source mapped; ingredient rule not imported | 0 | Portuguese with INCI crosswalks |
| India | Source mapped Official source mapped; ingredient rule not imported | 0 | English and Hindi |
| Saudi Arabia | Source mapped Official source mapped; ingredient rule not imported | 0 | Arabic and English |
Chemical identity and properties
Decamethylcyclopentasiloxane
Cyclomethicone 5 is member of cyclomethicone, which are a group of liquid methyl siloxanes that have low viscosity and high volatility. Cyclomethicones are cyclic in structure with a monomer backbone of one silicon and two oxygen atoms bonded together. Cyclomethicone 5 is used in cosmetic and personal products as a skin emollient. — DrugBank
- IUPAC name
- 2,2,4,4,6,6,8,8,10,10-decamethyl-1,3,5,7,9,2,4,6,8,10-pentaoxapentasilecane
- Molecular formula
- C10H30O5Si5
- Molecular weight
- 370.77 g/mol
- Exact mass
- 370.09395673 Da
- Topological polar surface area
- 46.2 Ų
- Hydrogen-bond donors
- 0
- Hydrogen-bond acceptors
- 5
- Covalent units
- 1
- Defined stereocentres
- 0
Also known as
16 more reported names
External database identifiers
- ChEBI:CHEBI:191092
- ChEMBL:CHEMBL1885178
- EPA DTXSID:DTXSID1027184
- PubMed:37551828
- PubMed:31836225
- PubMed:27601420
- PubMed:25680588
- PubMed:22966705
- PubMed:22575024
- PubMed:22571757
- PubMed:22304371
- PubMed:22221665
- PubMed:22197313
- PubMed:22097543
- PubMed:21912567
Retrieved from NIH PubChem on 2026-09-02 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.
Inventory details for CYCLOPENTASILOXANE
INCI name
CYCLOPENTASILOXANE
Description
Decamethylcyclopentasiloxane
Record provenance
- Inventory reference
- 75413
- Imported identity
- CYCLOPENTASILOXANE
- Source update
- 28/07/2020
Annex records for CYCLOPENTASILOXANE
Key data
- HAIR CONDITIONING
- Enhancing the appearance and feel of hair. Leaving the hair easy to comb, supple, soft and shiny and/or imparting volume, lightness, gloss, texture, etc.
- SKIN CONDITIONING
- Maintaining the skin in good condition.
- SKIN CONDITIONING - EMOLLIENT
- Acting as lubricants on the skin surface providing the skin with a soft and smooth appearance.
- SOLVENT
- Dissolving other components of cosmetics. Solvents are usually liquids (aqueous and nonaqueous).
Official EU ingredient-name evidence
The ingredient name exactly matches the official 2025 EU glossary of common ingredient names.
Related inventory evidence
Ingredients with overlapping formulation functions
Additional official and scientific sources
11 external databases to check this identity in
Each link searches that source for this identity. What each source is, and its legal weight
How CYCLOPENTASILOXANE appears in the CosIng inventory
The CosIng inventory lists CYCLOPENTASILOXANE as a cosmetic ingredient and this page links it to 0 annex records. The inventory entry captures names and identifiers, while the annex records show where the substance is prohibited, restricted or positively listed in EU cosmetics law.
CYCLOPENTASILOXANE is also tagged with 4 cosmetic functions in the official data. Function labels describe intended use, but they do not replace regulatory review of linked annex records before formulation or labelling work.
Frequently asked questions
Source note for CYCLOPENTASILOXANE
This page reproduces the CosIng inventory entry for CYCLOPENTASILOXANE from public European Commission cosmetic ingredient materials and shows linked identifiers even when no direct annex match is currently attached.
Use this inventory page to research CYCLOPENTASILOXANE and compare linked records, but verify restrictions and legal status against the current official source text and law before making regulatory decisions.
Tools & next steps
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