Cyclopentasiloxane
Decamethylcyclopentasiloxane (D5)
D5 bioaccumulates in aquatic environment; EU restricted in rinse-off cosmetics; endocrine disruption concern (aquatic); brands should reformulate rinse-off products if above EU limit; leave-on permitted; check if submission is rinse-off
Function & Common Use
Solvent / Emollient / Carrier for silicones
Silicone
Hair conditioners, serums, sunscreens
Synthetic
Concentration Limits
No formal limit
Max 0.1% in rinse-off (EU from Jan 2020)
Format restriction: Rinse-off: max 0.1% EU; Leave-on: permitted
Baby restriction: Avoid in baby rinse-off
Frequently Asked Questions
Is Cyclopentasiloxane safe to use in skincare?
Cyclopentasiloxane has a Medium concern rating. D5 bioaccumulates in aquatic environment; EU restricted in rinse-off cosmetics; endocrine disruption concern (aquatic); brands should reformulate rinse-off products if above EU limit; leave-on permitted; check if submission is rinse-off
Is Cyclopentasiloxane allowed in India?
Cyclopentasiloxane is currently classified as "Permitted" under Indian cosmetics regulations. The maximum permitted concentration is No formal limit.
What is Cyclopentasiloxane used for in cosmetics?
Cyclopentasiloxane functions as: Solvent / Emollient / Carrier for silicones. It is commonly found in: Hair conditioners, serums, sunscreens.
Is Cyclopentasiloxane safe for babies?
Cyclopentasiloxane has baby/child restrictions: Avoid in baby rinse-off. Avoid using products containing this ingredient on infants unless specifically formulated and labelled for baby use.
Regulatory Status
EU Annex: EU Annex III
Identifiers
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