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Public Health

Decamethylcyclopentasiloxane (cyclopentasiloxane, D5) in cosmetic products

Final Opinion


Datum der Veröffentlichung
29 Juli 2016
Scientific Committee on Consumer Safety (SCCS)


SCCS members: U. Bernauer, P. Coenraads, G. Degen, M. Dusinska, W. Lilienblum, E. Nielsen, T. Platzek, S. C. Rastogi, Ch. Rousselle, Ja. van Benthem
External experts: A. Bernard, A. Giménez-Arnau, T. Vanhaecke
On request from: European Commission
SCCS Number: SCCS/1549/15
Adopted on: 25 March 2015 - Final version of 29 July 2016

Conclusion of the opinion:

(1) On the basis of the data provided does the Scientific Committee on Consumer Safety (SCCS) consider Cyclopentasiloxane (D5) safe as cosmetic ingredient?

The SCCS considers that the use of Cyclopentasiloxane (D5) in cosmetic products is safe at the reported concentrations, except for use in hair styling aerosols and sun care spray products. Indeed, for these products, at the maximal concentrations declared by the applicant and based on the hypothesis retained by SCCS, exposure to D5 may lead to air concentrations above the value where SCCS considered that D5 may be aerosolized and locally toxic. Exposure to D5 coming from hair styling spray products also triggers high level of aggregated exposure which may also lead to concentrations in the air above the value considered safe by the SCCS.

This opinion does not cover the use of Cyclopentasiloxane (D5) in oral care products.

(2) Does the SCCS have any further scientific concerns in particular regarding the wide use of this ingredient in several cosmetic products and in different concentrations?

Cyclopentasiloxane (D5) may contain traces of Cyclotetrasiloxane (D4) which is classified in the EU as toxic to reproduction. Therefore, the level of impurity of Cyclotetrasiloxane (D4) as an impurity of Cyclopentasiloxane (D5) should be kept as low as possible.

SCCS is aware that restrictions on D4 and D5 in personal care products have been proposed under Reach regulation due to environmental issue.

This opinion did not address the potential impact of D5 on the environment.


SCCS, scientific opinion, decamethylcyclopentasiloxane (cyclopentasiloxane, D5), Regulation 1223/2009, CAS n. 541-02-6, EC number 208-764-9

Opinion to be cited as:

SCCS (Scientific Committee on Consumer Safety), Opinion on decamethylcyclopentasiloxane (cyclopentasiloxane, D5) in cosmetic products, SCCS/1549/15, 25 March 2015, final version of 29 July 2016.


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