INCI name

CYCLOPENTASILOXANE

Cyclopentasiloxane

Skin conditioning – emollient Hair conditioning Skin conditioning Solventreviewed

A volatile silicone (D5).

What it is

Cyclopentasiloxane is a cyclic silicone that evaporates after application, leaving a silky, non-greasy feel.

Where it is used

Historically common in hair serums, primers, antiperspirants and make-up.

Limits of interpretation

The INCI list shows which ingredients are present, not how much of each. Above 1%, ingredients are listed in descending order of weight; below 1% the order is free.

Under EU Regulation 2024/1328 the use of D4, D5 and D6 in cosmetics is restricted, with transitional periods. Check current rules for the product's market.

Functions

Skin conditioning – emollient: Acting as lubricants on the skin surface providing the skin with a soft and smooth appearance.
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.
Solvent: Dissolving other components of cosmetics. Solvents are usually liquids (aqueous and nonaqueous).

EU regulation

This ingredient is not listed in the annexes of Regulation (EC) No 1223/2009 in the CosIng data.

Scientific opinions (SCCS)

Decamethylcyclopentasiloxane (cyclopentasiloxane, D5) in cosmetic products

Opinions of the EU Scientific Committee on Consumer Safety that mention this ingredient. They assess specific uses and concentrations; read the opinion for its scope.

Products with this ingredient (641)

Check a full ingredient list