Ingredient
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Cyclopentasiloxane

✓ EU Allowed

Identification

CAS Number 541-02-6
EINECS / EC 208-764-9
CosIng Ref 75413
Chemical Name Decamethylcyclopentasiloxane,
Formula C10H30O5Si5
Mol. Weight 370.77 g/mol

Function & Classification

Primary Function Emollient
Secondary Functions Solvent, Skin Conditioning
Origin Synthetic
Category Silicones
Manufacturer BRB International B.V.

EU Regulatory Status

🇪🇺
✓ Allowed — EU Reg. 1223/2009 Restricted under COMMISSION REGULATION (EU) 2024/1328. 1. Shall not be placed on the market (a) as a substance on its own; (b) as a constituent of other substances; or (c) in mixtures; in a concentration equal to or greater than 0,1 % by weight of the respective substance after 6 June 2026. [...] 3. By way of derogation: (a) for D4 and D5 in wash-off cosmetic products, paragraph 1, point (c), shall apply after 31 January 2020. For the purposes of this point, “wash-off cosmetic products” means cosmetic products as defined in Article 2(1), point (a), of Regulation (EC) No 1223/2009 of the European Parliament and of the Council (*1) that, under normal conditions of use, are washed off with water after application; (b) for all cosmetic products other than the ones mentioned in paragraph 3(a), paragraph 1 shall apply after 6 June 2027.
Max Rinse-off 0.1%
Restrictions Maximum 0.1% in rinse-off cosmetic products (Annex III, entry 168)
Conditions of Use Restricted use under EU Reg. 2018/1139 amending Reg. 1223/2009. Not restricted in leave-on products at this concentration level.
SCCS Opinion View SCCS opinion →

Safety Profile

1 / 10
✅
Comedogenic Rating: 1/5
Low risk — should be fine for most skin types
Skin Type Compatibility
💧 Acne-Prone ✓ Safe
🍄 Fungal Acne Safe ✓ Safe
Toxicology Profile
NOAEL 300 mg/kg bw/day (inhalation, rat) SCCS/1549/15
Sensitization Non-sensitizer
Genotoxicity Non-genotoxic
Phototoxicity Non-phototoxic
Dermal Absorption 0.5%
LD₅₀ Oral >5000 mg/kg (rat)
LD₅₀ Dermal >2000 mg/kg (rabbit)
Skin Irritation (Draize) 0.0 / 4.0
Eye Irritation (Draize) 0.2 / 4.0
Source SCCS Opinion ↗

Formulation Guidelines

Solubility immiscible
Benefits Volatile; dry finish; carrier

Suppliers & Documents

BRB International B.V. 🇳🇱 Netherlands
BRB 1288 Manufacturer
Azelis 🇧🇪 Belgium
Turkey distributor
Documents

External Resources

INCIDecoder → EU CosIng →