C10H30O5Si5
370.77 g/mol
cosmetic_ingredientWarning
Cyclomethicone 5
CAS541-02-6EC208-764-9
Category
cosmetic_ingredient
Compound Class
Heterocycle
Primary Use
Carrier in personal care products
Decamethylcyclopentasiloxane is an organosilicon compound commonly used as a carrier in personal care products. It is a cyclic siloxane with a ring structure that provides volatile, non-greasy properties for cosmetic formulations.
Carrier in personal care productsDry cleaning solventIntermediate in siloxane polymer production
Content scope: Information here supports chemical identification and industrial supply, research, and manufacturing contexts. It is not a therapeutic claim, medical advice, or drug-use instructions.
Restricted or banned substances
Substances on this list are banned or restricted under the named regulation. This page is a compliance reference — verify your obligations under applicable law.
Relevant lists:EU REACH Restriction List
CAS 541-02-6
Related Compounds
StrongStructure SimilarSimilarity 1.00
Octamethylcyclotetrasiloxane
CAS556-67-2
Cosmetic ingredient and industrial solvent
ReferenceSame Category
Myristoleic acid
CAS544-64-9
Cosmetic ingredient and fatty acid
ReferenceSame Category
Phytosphingosine
CAS554-62-1
Skin care ingredient
ReferenceSame Category
Methylchloroisothiazolinone/methylisothiazolinone
CAS55965-84-9
Biocide preservative in consumer products
ReferenceSame Category
Palmitic acid
CAS57-10-3
cosmetic formulation ingredient
Safety Reference
Warning
H227
H373May cause damage to organs through prolonged or repeated exposure
H413May cause long lasting harmful effects to aquatic life
Customs Tariff Classification
The international HS code for Cyclomethicone 5 (CAS 541-02-6) is 2931.90.
HS code (international, 6-digit)
2931.90
EU CN code (8-digit)
2931 90 00
Classification per the EU customs inventory ECICS (2026-07 snapshot, HS 2022). National tariff lines and product form can affect the final classification.
Identifiers
IUPAC Name
2,2,4,4,6,6,8,8,10,10-decamethyl-1,3,5,7,9,2,4,6,8,10-pentaoxapentasilecane
InChIKey
XMSXQFUHVRWGNA-UHFFFAOYSA-N
SMILES
C[Si]1(O[Si](O[Si](O[Si](O[Si](O1)(C)C)(C)C)(C)C)(C)C)C
Synonyms (41)
- D5
- Cyclomethicone 5, United States Pharmacopeia (USP)
- 3CE PINK IM GOOD MASCARA
- Botanisil CP 33
- CYCLOPENTASILOXANE (D5)
- Ciclopentasiloxane
- Cyclomethicone 5
- Cyclomethicone D5
- D5-sil
- Ddecamethylcyclopentasiloxane
- Decamethylcylopentasiloxane
- Dekamethylcyklopentasiloxan
- Dimethylsiloxane pentamer
- Dow corning 345
- JEESILC CPS-211
- Lightening Serum
- NUC silicone VS 7158
- Silicon SF 1202
- Simethicone Impurity 4
- Smooth and Soft Cuticles
- XIAMETER PMX-0245
- decamethyl cyclopentasiloxane
- dimethylcyclopentasiloxane